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0ctf 2022 nft market
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<p><strong>前言</strong></p>
<ul>
<li>0ctf 2022 nft 题目，失败的复盘，赛中调试出来了进入 verifyCoupon 后 orderid 会变成 0，但没有继续调试后面的 orderid，233333，赛后才知道了是 solidity 8.16 版本之前的 bug</li>
<li>主要漏洞原理参考 <a href="https://blog.soliditylang.org/2022/08/08/calldata-tuple-reencoding-head-overflow-bug/" rel="external nofollow noopener noreferrer" target="_blank">https://blog.soliditylang.org/2022/08/08/calldata-tuple-reencoding-head-overflow-bug/</a></li>
<li>具体就不分析了，别的师傅已经写的很好了，这里就只放出自己的 exp</li>
<li>参考 <a href="https://s3cunda.github.io/2022/09/19/0ctf-2022-NFT-Market.html" rel="external nofollow noopener noreferrer" target="_blank">https://s3cunda.github.io/2022/09/19/0ctf-2022-NFT-Market.html</a></li>
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<li>第六届 <code>qwb</code> 线下赛 <code>bytebyte</code> 赛题 <code>WP</code></li>
<li>恭喜中国科学技术大学师傅一血</li>
<li>考点是 <a href="https://en.wikipedia.org/wiki/Return-oriented_programming" rel="external nofollow noopener noreferrer" target="_blank">Return Oriented Programming</a></li>
<li><code>revenge of EGM</code>，堆栈细节可参考 <a href="https://hitcxy.com/2020/egm/">https://hitcxy.com/2020/egm/</a></li>
<li>相比于 <code>EGM</code> ，<code>bytebyte</code> 调整了循环变量的位置，循环变量是个范围，按照个人的构思，如果 <code>calldata</code> 长度是 <code>4+32*11</code> 字节，则这个值是固定的，变相让循环变量起到固定 <code>canary</code> 的作用，不过也不能排除更短的 <code>calldata</code>，所以题目设计是比较 <code>calldata</code> 的数值大小。</li>
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