CVE-2021-3156 PoC — Sudo 缓冲区错误漏洞

Source

https://github.com/ph4ntonn/CVE-2021-3156

Associated Vulnerability

Title: Sudo 缓冲区错误漏洞 (CVE-2021-3156)
Description:Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

Description

CVE-2021-3156

Readme

# CVE-2021-3156

## 概述

Heap-based buffer overflow in Sudo (CVE-2021-3156)

由于```sudo```转义```\```不当而造成的堆溢出漏洞，LPE

## 影响范围

从1.8.2到1.8.31p2的所有版本

从1.9.0到1.9.5p1的所有稳定版本

## 检测命令

```sudoedit -s '\' `perl -e 'print "A" x 65536'```

如果出现类似```Segmentation fault (core dumped)```即表明存在漏洞

## 相关文献

https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt

## 分析

先占个坑，正在调试分析中，等分析完写完blog贴链接

File Snapshot

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