CVE-2021-41773 PoC — Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49

Source

https://github.com/5gstudent/cve-2021-41773-and-cve-2021-42013

Associated Vulnerability

Title:Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 (CVE-2021-41773)
Description:A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

Description

cve-2021-41773 即 cve-2021-42013 批量检测脚本

Readme

# cve-2021-41773 and cve-2021-42013

cve-2021-41773 和 cve-2021-42013 批量验证python脚本

运行环境：python3

用法：python3 poc.py url.txt

url.txt放待检测的url，存在漏洞的url会被写入success.txt

验证内容很简单，get请求发送`cgi-bin/.%2e/.%2e/.%2e/.%2e/.%2e/.%2e/.%2e/.%2e/.%2e/etc/passwd`就行，但是我用requests发包发现不行，抓包发现`%2e`会被自动解码成`.`，于是采用urllib发包，发现没问题，本地测试成功。

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →

Goal Reached Thanks to every supporter — we hit 100%!