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<h1 id="Frida-server"><a href="#Frida-server" class="headerlink" title="Frida server"></a>Frida server</h1><p>服务器配置</p>
<ul>
<li>操作系统：Ubuntu Linux</li>
<li>IP：192.168.76.142</li>
<li>OpenJDK 11, OpenJFX</li>
</ul>
<p>运行Frida server</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">user@VMware-Virtual-Platform:~/apps$ sudo ./frida-server-16.4.4-linux-x86_64 -l 0.0.0.0:23947</span><br></pre></td></tr></table></figure>
<p>运行java用户程序</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">user@VMware-Virtual-Platform:~/challs$ java --module-path $PATH_TO_FX --add-modules javafx.controls,javafx.fxml -jar ./WhackAMoleGame_flag1.jar & echo "$!"</span><br><span class="line">[1] 53915</span><br><span class="line">53915</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h1 id="Frida-client"><a href="#Frida-client" class="headerlink" title="Frida client"></a>Frida client</h1><p>python部分：</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> frida</span><br><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">with</span> <span class="built_in">open</span>(sys.argv[<span class="number">1</span>], <span class="string">"r"</span>) <span class="keyword">as</span> f:</span><br><span class="line"> jscode = f.read()</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">printMessage</span>(<span class="params">message, data</span>):</span></span><br><span class="line"> <span class="keyword">if</span> message[<span class="string">"type"</span>] == <span class="string">"send"</span>:</span><br><span class="line"> <span class="built_in">print</span>(<span class="string">"[*] {0}"</span>.<span class="built_in">format</span>(message[<span class="string">"payload"</span>]))</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> <span class="built_in">print</span>(message)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">device = frida.get_device_manager().add_remote_device(<span class="string">"192.168.76.142:23947"</span>)</span><br><span class="line"><span class="built_in">print</span>(device)</span><br><span class="line">process = device.attach(<span class="number">53915</span>)</span><br><span class="line"></span><br><span class="line">script = process.create_script(jscode)</span><br><span class="line">script.on(<span class="string">"message"</span>, printMessage)</span><br><span class="line">script.load()</span><br><span class="line">sys.stdin.read()</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>JavaScript部分:</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// let libjvm = Module.enumerateSymbolsSync('libjvm.so');</span></span><br><span class="line">Java.perform(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">var</span> ClassName = Java.use(<span class="string">"yyyyy"</span>);</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">"Find ClassName Successfully!"</span> + ClassName); <span class="comment">//定位类成功！</span></span><br><span class="line"></span><br><span class="line"> Java.enumerateLoadedClasses({</span><br><span class="line"> <span class="attr">onMatch</span>: <span class="function"><span class="keyword">function</span> (<span class="params">c</span>) </span>{</span><br><span class="line"> <span class="keyword">if</span> (!c.includes(<span class="string">"xxxxx"</span>)) <span class="keyword">return</span>;</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="built_in">console</span>.log(c);</span><br><span class="line"> <span class="keyword">let</span> props =</span><br><span class="line"> <span class="string">"\t"</span> + <span class="built_in">Object</span>.getOwnPropertyNames(Java.use(c).__proto__).join(<span class="string">", "</span>);</span><br><span class="line"> <span class="built_in">console</span>.log(props);</span><br><span class="line"> } <span class="keyword">catch</span> (error) {}</span><br><span class="line"> },</span><br><span class="line"></span><br><span class="line"> <span class="attr">onComplete</span>: <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{},</span><br><span class="line"> });</span><br><span class="line"></span><br><span class="line"> <span class="keyword">let</span> clazz1 = Java.use(<span class="string">"packegeName.className"</span>);</span><br><span class="line"> clazz1[<span class="string">"foo1"</span>].overload().implementatin = <span class="function">() =></span> {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">"foo1"</span>);</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> clazz1[<span class="string">"foo2"</span>].overload(<span class="string">"java.lang.String"</span>).implementatin = <span class="function">(<span class="params"></span></span></span><br><span class="line"><span class="params"><span class="function"> s</span></span></span><br><span class="line"><span class="params"><span class="function"> </span>) =></span> {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">"foo2"</span> + s);</span><br><span class="line"> };</span><br><span class="line">});</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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<h1 id="springboard"><a href="#springboard" class="headerlink" title="springboard"></a>springboard</h1><p>格式化字符串漏洞，且字符串不在栈上的类型：</p>
<p>通过任意地址写，将main函数的ret addr改为one gadget即可。</p>
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<h1 id="stdout"><a href="#stdout" class="headerlink" title="stdout"></a>stdout</h1><p>main函数调用init：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">init</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> setvbuf(<span class="built_in">stdout</span>, <span class="number">0LL</span>, <span class="number">0</span>, <span class="number">0LL</span>);</span><br><span class="line"> <span class="keyword">return</span> setvbuf(<span class="built_in">stdin</span>, <span class="number">0LL</span>, <span class="number">2</span>, <span class="number">0LL</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>setvbuf第三个参数用来控制文件流的缓冲模式，可以在下面三个值中选择：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> _IOFBF <span class="comment">// argument to setvbuf indicating fully buffered I/O</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> _IOLBF <span class="comment">// argument to setvbuf indicating line buffered I/O</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> _IONBF <span class="comment">// argument to setvbuf indicating unbuffered I/O</span></span></span><br></pre></td></tr></table></figure>
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<h1 id="1-引言"><a href="#1-引言" class="headerlink" title="1 引言"></a>1 引言</h1><p>简单记录了这三天来编译Android系统内核、驱动走过的路。遇到了很多坑和不懂的东西，为了下次少走些弯路所以简单总结下。横跨很多天的工作不免记忆模糊，如果参考本博客时遇到问题欢迎大家下方留言和指正。</p>
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<h1 id="1-引言"><a href="#1-引言" class="headerlink" title="1 引言"></a>1 引言</h1><p>几年来，逆向一直停留在CTF坐牢水平，脱壳也就会用工具、最多说说原理。所以决定开始“深入”了解下脱VMP壳。当然，毕竟要循序渐进，我们还是从最简单的开始。这里我们选择了VMP1.1版本，自己编写简单的程序并用其加壳，将原程序与加壳后程序进行对比分析。</p>
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<h1 id="win32k漏洞"><a href="#win32k漏洞" class="headerlink" title="win32k漏洞"></a>win32k漏洞</h1><p>win32k.sys运行在Windows系统内核态，主要负责GUI相关的工作，用户态的user32.dll与其合作。个人感觉比较常见的漏洞对象在于tagWnd及其相关的数据结构和API。</p>
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