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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# 6.1.6 pwn DefconCTF2015 fuckup
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- [ret2vdso 原理](#ret2vdso-原理)
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- [题目解析](#题目解析)
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- [Exploit](#exploit)
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- [参考资料](#参考资料)
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## ret2vdso 原理
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在你使用 `ldd` 命令时，通常会显示出 vDSO，如下：
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```
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$ ldd /usr/bin/ls
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linux-vdso.so.1 (0x00007ffff7ffa000)
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libcap.so.2 => /usr/lib/libcap.so.2 (0x00007ffff79b2000)
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libc.so.6 => /usr/lib/libc.so.6 (0x00007ffff75fa000)
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/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007ffff7dd8000)
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```
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32 位程序则会显示 `linux-gate.so.1`，都是一个意思。
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## 题目解析
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```
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$ file fuckup
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fuckup: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped
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$ checksec -f fuckup
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RELRO STACK CANARY NX PIE RPATH RUNPATH FORTIFY Fortified Fortifiable FILE
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No RELRO No canary found NX enabled No PIE No RPATH No RUNPATH No 0 0 fuckup
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```
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## Exploit
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完整的 exp 如下，其他文件放在了[github](../src/writeup/6.1.6_pwn_defconctf2015_fuckup)相应文件夹中：
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## 参考资料
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- `man vdso`
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- [Return to VDSO using ELF Auxiliary Vectors](http://v0ids3curity.blogspot.in/2014/12/return-to-vdso-using-elf-auxiliary.html)
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