CVE-2024-3094 PoC — Xz: malicious code in distributed source

Source

https://github.com/MrBUGLF/XZ-Utils_CVE-2024-3094

Associated Vulnerability

Title: Xz: malicious code in distributed source (CVE-2024-3094)
Description:Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.

Description

XZ-Utils工具库恶意后门植入漏洞(CVE-2024-3094)

Readme

# 漏洞概述

XZ是一种数据压缩格式，几乎存在每个Linux发行版中。liblzma是一个处理XZ压缩格式的开源软件库。3月29日开发人员发现XZ包的供应链攻击，溯源发现SSH上游liblzma库被植入后门木马，当满足一定条件时，会解密流量里的C2命令执行。

* 漏洞编号: CVE-2024-3094
* CVSS 3.1评分：10.0
* 威胁类型：供应链攻击、后门
* POC状态：已公开
* EXP状态：已公开

# 影响版本

* xz == 5.6.0、5.6.1
* liblzma == 5.6.0、5.6.1

| OS                                   | Package name | Package version(s) | Fix package version | Reference |
| ------------------------------------ | ------------ | ------------------ | ------------------- | --------- |
| Fedora 40, Rawhide                   | xz           | 5.6.0, 5.6.1       | Revert to 5.4.x     | Details   |
| Debian unstable (Sid)                | xz-utils     | 5.6.1              | Revert to 5.4.5     | Details   |
| Alpine edge                          | xz           | 5.6.1-r2           | Revert to 5.4.x     | Details   |
| Arch Linux                           | xz           | 5.6.0-1, 5.6.1-1   | Upgrade to 5.6.1-2  | Details   |
| openSUSE Tumbleweed openSUSE MicroOS | xz           | 5.6.0              | Revert to 5.4.x     | Details   |

# 自查脚本

:bulb: [XZ-Utils-POC.sh](./XZ-Utils-POC.sh)

![image-20240401095227113](./images/image-20240401095227113.png)

# 修复建议

目前暂无最新版本，需要对XZ版本进行降级到5.4.x

File Snapshot

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