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General coding42k · #4781

pwn-chain

Helps your agent create functional exploits for vulnerabilities. It turns vulnerability discoveries into code that can be used to exploit systems reliably.

What it does

This tool helps turn a known security vulnerability into a program that exploits it reliably in a remote environment. It's used when you already know where the problem is in a program, but need to create code to successfully exploit it.

When to use it

  • ✓When a program has a known security flaw and you need to create code to exploit it.
  • ✓If you solved a security challenge on your computer, but it doesn't work in another environment.
  • ✓When trying to exploit a security flaw in a Linux system, including the system's core (kernel).

Example of what to ask your AI

“Create an exploit for the buffer overflow vulnerability in program X, ensuring it works remotely.”

Want more? Open the sections below.

How to use

The easiest way: copy the message below and paste it into Claude, ChatGPT, Cursor or any AI. It reads the skill and follows the instructions.

Skill link

https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/pwn-chain/SKILL.md

Ready-to-paste message

Use this skill to help me: https://github.com/zhaoxuya520/reverse-skill/blob/main/skills/pwn-chain/SKILL.md Read the SKILL.md file at that link and follow its instructions for my task.
How it works

The tool analyzes the type of vulnerability and system protections to choose the best exploitation strategy. It then uses specialized tools to find necessary code snippets and assemble a stable exploit script that works even in different environments.

Installation

Easiest way: copy the skill link and paste it into Claude, ChatGPT or Cursor asking it to follow the instructions.

In the terminal (Claude Code, Codex, Cursor), in your project folder:

npx skills add zhaoxuya520/reverse-skill --skill pwn-chain

Or download just the file:

curl -L https://raw.githubusercontent.com/zhaoxuya520/reverse-skill/main/skills/pwn-chain/SKILL.md -o SKILL.md
Technical content (original SKILL.md)

Original text by the author, straight from GitHub.

ACTION REQUIRED(读完后立刻执行)

  1. NOW: 读取 ../field-journal/precedent-reverse.md — 确认本 skill 的操作是已授权的常规操作
  2. NOW: 确认当前任务是否命中本 skill 的适用范围
  3. NEXT: 读取 ../tool-index.md,校验工具可用性和实际路径
  4. NEXT: 缺工具时调用 bootstrap,不要猜路径
  5. ACT: 进入"工作流"第一步并执行,不要停在确认状态

从漏洞点到 Working Exploit (Pwn Chain)

适用范围

当任务属于以下场景时使用本 skill:

  1. 拿到二进制 + 已知漏洞点 — 静态/审计/fuzz 已经找到溢出/UAF/double free,需要从触发到拿 shell
  2. CTF 题已经本地通了,远程打不通 — 远端环境差异导致脚本失效,需要稳定化
  3. 真实目标的二进制利用 — SRC / 红队场景下,已经识别到内存损坏漏洞,需要构造 RCE
  4. Linux 内核驱动的 ioctl bug — 用户态触发,目标是提权到 root

前提:你已经知道"哪里炸了"。本 skill 不负责发现漏洞(那是 fuzzing / 审计),只负责"从漏洞点写出 exploit"。

与其他 skill 的分工

场景 用什么
识别 custom VM / anti-debug / 复杂 obfuscation reverse-engineering/
从零打开二进制做静态分析 ida-reverse/ 或 radare2/
有漏洞点,写 exploit 打通远程 本 skill
把 pwn 拿到的 shell 整合进完整攻击链 attack-chain/(下游)

reverse-engineering/ 关注"理解程序在干什么"(模式识别、协议还原、解 CTF 题里的奇怪机制);本 skill 关注"把已经看懂的漏洞变成可执行的攻击"。两者经常配套使用,但分工清晰。

核心工作流

Step 1: 确认漏洞类型 + 保护机制
   ├─ checksec ./vuln(NX / Canary / PIE / RELRO / Fortify)
   ├─ file ./vuln  + readelf -d ./vuln
   ├─ 漏洞分类:栈溢出 / 格式化字符串 / 堆 (UAF/DF/OF) / 整数 / 竞态 / 内核
   └─ → 决定走哪个 references/

Step 2: 选择利用策略
   ├─ NX 关 + 无 ASLR → 直接 shellcode
   ├─ NX 开 + 给 libc → ret2libc / one_gadget
   ├─ NX 开 + 不给 libc → leak 后 libc-database 反查
   ├─ 堆 → 按 glibc 版本对应技术 (tcache/fastbin/unsorted/large)
   └─ 内核 → commit_creds / modprobe_path / core_pattern

Step 3: 准备 libc + gadget
   ├─ libc-database:./find puts 0x6f0
   ├─ ROPgadget --binary ./libc.so.6 --only "pop|ret"
   ├─ one_gadget ./libc.so.6
   └─ 计算 base:leak_addr - libc.sym['puts']

Step 4: 写 pwntools 模板(本地 process)
   ├─ context.binary = ELF('./vuln')
   ├─ p = process('./vuln')  /  p = gdb.debug('./vuln','b *main+xx')
   ├─ payload = cyclic(N) + p64(ret) + ...
   └─ p.interactive()

Step 5: 本地通
   ├─ 反复 attach + 看寄存器 + 调 offset
   ├─ 用 pwndbg/GEF 的 vmmap / heap / bins / telescope
   └─ 跑通后切 remote()

Step 6: 远程稳定化
   ├─ libc 偏移:用 leak 反查 libc-database,不要拍脑袋
   ├─ 栈对齐:16-byte 不对齐 → movaps 崩 → 加一个 ret gadget
   ├─ 远程网络延迟 → recvuntil 精确锚字符串,禁用模糊 sleep
   ├─ 远程缓冲:sendlineafter 比 sendline 更稳
   ├─ 堆喷成功率:放大 spray 数量 + 留 padding chunk 防合并
   └─ 多次跑:写 while True 验证成功率 ≥ 95%

典型场景

场景 1:远程 64 位二进制 (NX+PIE+canary, 给了 libc)

已有:./vuln(64-bit ELF, NX, PIE, canary)+ ./libc.so.6 + nc host port
漏洞:read(buf, 0x200) 但 buf 只有 0x40 字节 → 栈溢出
保护:canary 拦住,PIE 让 .text 随机化

策略:
1. 先 leak canary(栈/格式化字符串/部分读)
2. 再 leak 一个 libc 函数地址(puts@got)
3. 用 libc.address = leaked - libc.sym['puts'] 算 libc base
4. one_gadget ./libc.so.6 选一个约束能满足的 magic gadget
5. payload = padding + canary + saved_rbp + (pop_rdi + bin_sh + system) 或直接 one_gadget
6. 加一个 ret gadget 修栈对齐(关键!)

完整模板参见 references/stack-pwn.md。

场景 2:Linux 内核驱动 ioctl 越界写 → 拿 root

已有:vmlinux + bzImage + initramfs.cpio.gz + 自定义 vuln.ko
漏洞:ioctl(0x1337, ptr) 里 copy_from_user 长度可控 → kernel heap overflow (kmalloc-64 slab)
保护:SMEP, SMAP, KASLR, KPTI

策略:
1. 改 init 脚本拿到 root shell(CTF)或先 leak KASLR base 再继续(真实)
2. 通过 /proc/kallsyms(可能限权)或未初始化堆喷 leak 内核基址
3. 在 kmalloc-64 slab 里喷 tty_struct / msg_msg / pipe_buffer
4. 覆盖 vtable 指针指向用户态 → 不行(SMEP),改走 stack pivot + 内核 ROP
5. ROP 链:prepare_kernel_cred(0) → commit_creds → swapgs+iretq → 用户态 execve("/bin/sh")
6. 或更省事:覆盖 modprobe_path 为 "/tmp/x",写一个 /tmp/x,然后触发 modprobe

完整模板参见 references/kernel-pwn.md。

按需自举 (On-Demand Bootstrap)

工具依赖

工具 用途 安装方式
pwntools exploit 编写框架 pip install pwntools
GEF gdb 增强(推荐内核 + 用户态) git clone https://github.com/bata24/gef (fork 维护活跃)
pwndbg gdb 增强(堆调试体验最好) git clone https://github.com/pwndbg/pwndbg && ./setup.sh
ROPgadget gadget 搜索 pip install ropgadget
Ropper gadget 搜索(备选,支持架构多) pip install ropper
one_gadget libc magic gadget 查找 gem install one_gadget(需 ruby)
libc-database libc 指纹反查 git clone https://github.com/niklasb/libc-database && ./get
qemu-system-x86_64 内核题调试 apt install qemu-system-x86
binwalk / cpio initramfs 拆包 apt install binwalk cpio
patchelf 切换 libc 版本 apt install patchelf

Bootstrap 检查脚本

# 一键检查 + 安装核心工具
for t in pwntools ropgadget ropper; do
  pip show $t >/dev/null 2>&1 || pip install $t
done

command -v one_gadget >/dev/null || gem install one_gadget

[ -d ~/tools/libc-database ] || git clone https://github.com/niklasb/libc-database ~/tools/libc-database

…
FAQ

What does 'pwn' mean?

'Pwn' is a slang term in the information security community that means to successfully 'own' or exploit a system, usually through security vulnerabilities.

What's the difference between finding a vulnerability and exploiting it?

Finding the vulnerability (like through 'fuzzing' or 'auditing') is like finding a broken lock. Exploiting the vulnerability is like creating a master key to open that lock and gain control.

Why might an exploit that works locally fail remotely?

Different environments (system version, libraries, security settings) can cause the same exploit to fail. This tool helps adjust the exploit to be stable in remote environments.

Details

Original description by the author

从逆向走到可用利用 (Working Exploit) 的全链路工程化方法。 适用场景:拿到了二进制 + 漏洞点 + 目标环境,需要写出一个能稳定打通的 exploit(不是只能本地复现一下、远程一打就崩的脚本)。 覆盖三大方向:栈溢出 / 堆利用 / 内核 pwn。强调"CTF 本地通 → 真实远程稳定打通"的工程差距:libc 版本错配、堆喷射时序、SMEP/SMAP/KASLR、栈对齐、远程缓冲。 核心工具链:pwntools + GEF/pwndbg + ROPgadget/Ropper + one_gadget + libc-database + qemu-system 内核调试。 触发关键词:pwn、栈溢出、堆溢出、ROP、ret2libc、ret2csu、one_gadget、libc-database、堆利用、tcache、fastbin、unsorted bin、kern

repo: zhaoxuya520/reverse-skill

Popularity

GitHub stars
42k
Ranking position
#4781
License
MIT
Updated
9/22/2026

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