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<a class="post-title-link" href="/2019/09/24/2019数字经济云安全共测大赛初赛-pwn/" itemprop="url">2019数字经济云安全共测大赛初赛_pwn</a></h1>
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比赛一共3题pwn，两题入门，最后一题中等挺有意思，涉及到seccomp以及shellcode爆破flag
题目地址： https://github.com/hacker-mao/ctf_repo/tree/master/2019%E6%95%B0%E5%AD%97%E7%BB%8F%E6%B5%8E%E4%BA%91%E5%AE%89%E5%85%A8%E5%85%B1%E6%B5%8B%E5%A4%A7%E8%B5%9B%E5%88%9D%E8%B5%9B
fkroman
与De1CTF 2019 的Weapon基本一样，delete存在uaf，edit函数存在堆溢出，题目没有输出
...
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Pwnpwn1
Run函数有个条件竞争，可以泄漏libc，后面libc换了2.27，所以条件竞争配合uaf写fd指针到__malloc_hook然后改为one_gadget即可
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题目地址：
https://github.com/hacker-mao/ctf_repo/tree/master/%E6%8A%A4%E7%BD%91%E6%9D%AF2019/pwn
一共4道题，比赛时间太短，赛后花了一天时间弄出3道，继续学习
mergeheap
libc2.27，典型的tcache题目，程序的漏洞在于off by one
当分配的堆块占用了下一chunk的pre_size位时，strcpy的时候会将下一chunk的size也复制，再配合strcat会溢出一个字节
首先先填满tcache，为了下一次free时候将会放入unsorted bin中，然后构造4个不和填
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