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<!DOCTYPE html>
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<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/02/24/buuctf-misc-1/" target="_self">
BUUCTF-Misc刷题记录
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/24/buuctf-misc-1/" target="_self">
<div>
你竟然赶我走 flag{stego_is_s0_bor1ing} 大白 文件属性中存在异常，猜测是修改了图片高度 在010 Editor中得到00 00 02 A7和00 00 01 00，分别为图片的宽高，将图片宽高设置为一致： 乌镇峰会种图 跟你竟然赶我走思路一样 N种方法解决 得到一个exe，甩vsc里看到这长长一大坨：
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2026-02-24 16:28" pubdate>
2026-02-24
</time>
</div>
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<span class="category-chains">
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<a href="/categories/Misc/" class="category-chain-item">Misc</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/BUUCTF/">#BUUCTF</a>
<a href="/tags/CTF/">#CTF</a>
<a href="/tags/Misc/">#Misc</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/02/20/use-after-free-learning/" target="_self">
UAF学习记录
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/20/use-after-free-learning/" target="_self">
<div>
原理 Use After Free即其字面所表达的意思，当一个内存块被释放之后再次被使用。但是其实这里有以下几种情况： 内存块被释放后，其对应的指针被设置为 NULL ， 然后再次使用，自然程序会崩溃。 内存块被释放后，其对应的指针没有被设置为 NULL ，然后在它下一次被使用之前，没有代码对这块内存块进行修改，那么程序很有可能可以正常运转。 内存块被释放后，其对应的指针没有被设置为 NULL，
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<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2026-02-20 15:21" pubdate>
2026-02-20
</time>
</div>
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<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Pwn/">#Pwn</a>
<a href="/tags/Heap/">#Heap</a>
<a href="/tags/UAF/">#UAF</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/02/14/hitcon-training-unlink/" target="_self">
hitcon-training-unlink writeup
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/14/hitcon-training-unlink/" target="_self">
<div>
Checksec # zer0ptr @ DESKTOP-FHEMUHT in ~/CTF-Pwn/heap/unlink/hitcontraining_unlink [15:14:56] $ checksec bamboobox [*] '/home/zer0ptr/CTF-Pwn/heap/unlink/hitcontraining_unlink/bamboobox'
</div>
</a>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2026-02-14 15:13" pubdate>
2026-02-14
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Heap/">#Heap</a>
<a href="/tags/unlink/">#unlink</a>
<a href="/tags/hitcon/">#hitcon</a>
</div>
</div>
</article>
</div>
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<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/02/11/heap-ptmalloc2-unlink/" target="_self">
Unlink学习记录
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/11/heap-ptmalloc2-unlink/" target="_self">
<div>
Overview unlink俗称脱链，就是将链表头处的free堆块从unsorted bin中脱离出来，然后和物理地址相邻的新free的堆块合并成大堆块(向前合并或向后合并)，再放入到unsorted bin中。 危害原理：通过伪造free状态的fake_chunk，伪造fd和bk指针，通过绕过unlink的检测实现unlink使其往p所在的位置写入p-0x18，从而实现任意地址写的漏洞。 漏
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<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2026-02-11 12:28" pubdate>
2026-02-11
</time>
</div>
<div class="post-meta mr-3 d-flex align-items-center">
<i class="iconfont icon-category"></i>
<span class="category-chains">
<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
</span>
</span>
</div>
<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/Pwn/">#Pwn</a>
<a href="/tags/%E5%A0%86/">#堆</a>
<a href="/tags/unlink/">#unlink</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/02/09/chunk-extend-overlapping/" target="_self">
Chunk Extend and Overlapping
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/09/chunk-extend-overlapping/" target="_self">
<div>
Overview chunk extend 是堆漏洞的一种常见利用手法，通过 extend 可以实现 chunk overlapping 的效果。这种利用方法需要以下的时机和条件： 程序中存在基于堆的漏洞 漏洞可以控制 chunk header 中的数据 ptmalloc对堆进行操作时使用的宏 chunk extend 技术能够产生的原因在于 ptmalloc 在对堆 chunk 进行操作
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<i class="iconfont icon-date"></i>
<time datetime="2026-02-09 21:37" pubdate>
2026-02-09
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<span class="category-chains">
<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
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<i class="iconfont icon-tags"></i>
<a href="/tags/%E5%A0%86%E6%BA%A2%E5%87%BA/">#堆溢出</a>
<a href="/tags/Heap/">#Heap</a>
<a href="/tags/Chunk-Extend-and-Overlapping/">#Chunk Extend and Overlapping</a>
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<h2 class="index-header">
<a href="/2026/02/07/offbyone/" target="_self">
offbyone学习记录
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/07/offbyone/" target="_self">
<div>
Description off-by-one漏洞是一种特殊的缓冲区溢出漏洞，其特殊之处在于off-by-one漏洞仅允许溢出一个字节，且该溢出字节未必是可控的。off-by-one漏洞常见于以下两种情况： 错误地设置了循环的边界（如将"<“误写为”<="）； 错误地使用了字符串处理函数字符串处理函数&zhida_source=entity)（不同的字符串
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<time datetime="2026-02-07 00:00" pubdate>
2026-02-07
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<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
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<i class="iconfont icon-tags"></i>
<a href="/tags/Heap/">#Heap</a>
<a href="/tags/%E5%A0%86/">#堆</a>
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<h2 class="index-header">
<a href="/2026/02/06/heap_glibc_malloc_chunk/" target="_self">
堆基础-glibc_malloc_chunk,bin,threading,arena,system_call
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</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/02/06/heap_glibc_malloc_chunk/" target="_self">
<div>
glibc_malloc_chunk Overview 在程序的执行过程中，我们称由 malloc 申请的内存为 chunk 。这块内存在 ptmalloc 内部用 malloc_chunk 结构体来表示。当程序申请的 chunk 被 free 后，会被加入到相应的空闲管理列表中。无论chunk的大小、状态如何，他们都是使用同一数据结构——malloc_chunk，只不过是表现形式有所不同。 ma
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<time datetime="2026-02-06 00:00" pubdate>
2026-02-06
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<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
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<i class="iconfont icon-tags"></i>
<a href="/tags/Heap/">#Heap</a>
<a href="/tags/%E5%A0%86/">#堆</a>
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<h2 class="index-header">
<a href="/2026/01/30/rain/" target="_self">
恋音と雨空
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/01/30/rain/" target="_self">
<div>
「好きだよ」と伝えればいいのに 願う先、怖くていえず 「好きだよ」と「好きだよ」が 募っては溶けてく 君との時間が一秒でも長くなるなら ずっとじゃなくていい 願いかける 恋音と雨空 君と離れてから数日目の土砂降りの雨の中 こんな日は必ず傘を届けにいった いつもの待ち合わせの場所いるはずのない面影待つ 傘もささず、ずぶ濡れな君はそこにいた 悴んだ手を温めることがもう一度できるなら 始まりの時まで戻り
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<time datetime="2026-01-30 00:00" pubdate>
2026-01-30
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<a href="/categories/%E6%9D%82%E8%A8%80%E7%A2%8E%E8%AF%AD/" class="category-chain-item">杂言碎语</a>
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<a href="/tags/%E9%9B%A8%E5%A4%A9/">#雨天</a>
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<h2 class="index-header">
<a href="/2026/01/24/RefleXGenThe_unexamined_code_is_not_worth_using/" target="_self">
【论文笔记】RefleXGen：The unexamined code is not worth using
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<a class="index-excerpt index-excerpt__noimg" href="/2026/01/24/RefleXGenThe_unexamined_code_is_not_worth_using/" target="_self">
<div>
基本信息 Title: RefleXGen: The unexamined code is not worth using Authors: Bin Wang, Hui Li*, AoFan Liu, et al. Affiliations: School of Electronic and Computer Engineering, Peking University (Shenzhen);
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<i class="iconfont icon-date"></i>
<time datetime="2026-01-24 00:00" pubdate>
2026-01-24
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<span class="category-chain">
<a href="/categories/LLM/" class="category-chain-item">LLM</a>
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<a href="/tags/LLM/">#LLM</a>
<a href="/tags/Code-Generation/">#Code Generation</a>
<a href="/tags/LLM%E5%AE%89%E5%85%A8/">#LLM安全</a>
<a href="/tags/RAG/">#RAG</a>
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<h2 class="index-header">
<a href="/2026/01/24/fmtstr-exploit-hijack-retaddr/" target="_self">
Hijack retaddr
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/01/24/fmtstr-exploit-hijack-retaddr/" target="_self">
<div>
原理 利用格式化字符串漏洞来劫持程序的返回地址到我们想要执行的地址。 例子 - 三个白帽 - pwnme_k0 Checksec # zer0ptr @ DESKTOP-FHEMUHT in ~/CTF-Training/Pwn/fmtstr/hijack_retaddr on git:master x [12:45:55] $ checksec pwnme_k0 [*] '/ho
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<time datetime="2026-01-24 00:00" pubdate>
2026-01-24
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<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
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<i class="iconfont icon-tags"></i>
<a href="/tags/%E6%A0%BC%E5%BC%8F%E5%8C%96%E5%AD%97%E7%AC%A6%E4%B8%B2%E6%BC%8F%E6%B4%9E/">#格式化字符串漏洞</a>
<a href="/tags/Pwn/">#Pwn</a>
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<h2 class="index-header">
<a href="/2026/01/24/fmtstr-exploit-hijackgot/" target="_self">
Hijack Got
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/01/24/fmtstr-exploit-hijackgot/" target="_self">
<div>
原理 在目前的 C 程序中，libc 中的函数都是通过 GOT 表来跳转的。此外，在没有开启 RELRO 保护的前提下，每个 libc 的函数对应的 GOT 表项是可以被修改的。因此，我们可以修改某个 libc 函数的 GOT 表内容为另一个 libc 函数的地址来实现对程序的控制。比如说我们可以修改 printf 的 got 表项内容为 system 函数的地址。从而，程序在执行 printf
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<time datetime="2026-01-24 00:00" pubdate>
2026-01-24
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<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>
</span>
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<div class="post-meta">
<i class="iconfont icon-tags"></i>
<a href="/tags/%E6%A0%BC%E5%BC%8F%E5%8C%96%E5%AD%97%E7%AC%A6%E4%B8%B2%E6%BC%8F%E6%B4%9E/">#格式化字符串漏洞</a>
<a href="/tags/Pwn/">#Pwn</a>
</div>
</div>
</article>
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<article class="col-12 col-md-12 mx-auto index-info">
<h2 class="index-header">
<a href="/2026/01/23/fmtstr-exploit-x64/" target="_self">
64 位程序格式化字符串漏洞
</a>
</h2>
<a class="index-excerpt index-excerpt__noimg" href="/2026/01/23/fmtstr-exploit-x64/" target="_self">
<div>
原理 其实 64 位的偏移计算和 32 位类似，都是算对应的参数。只不过 64 位函数的前 6 个参数是存储在相应的寄存器中的。但是在利用格式化字符串时，虽然我们并没有向相应寄存器中放入数据，但是程序依旧会按照格式化字符串的相应格式对其进行解析。 例子 2017 UIUCTF pwn200 Goodluck Checksec: # zer0ptr @ DESKTOP-FHEMUHT in ~/
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<time datetime="2026-01-23 00:00" pubdate>
2026-01-23
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<span class="category-chain">
<a href="/categories/Pwn/" class="category-chain-item">Pwn</a>