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CVE-2021-41773

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202208-20
Posted Aug 15, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202208-20 - Multiple vulnerabilities have been discovered in Apache Webserver, the worst of which could result in remote code execution. Versions less than 2.4.54 are affected.

tags | advisory, remote, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2021-33193, CVE-2021-34798, CVE-2021-36160, CVE-2021-39275, CVE-2021-40438, CVE-2021-41524, CVE-2021-41773, CVE-2021-42013, CVE-2021-44224, CVE-2021-44790, CVE-2022-22719, CVE-2022-22720, CVE-2022-22721, CVE-2022-23943
SHA-256 | 09faf82799a2bf38cabe52ae6e5241cdb6c0783b19a0355526c5faf16d5eadc3
Apache HTTP Server 2.4.50 Remote Code Execution
Posted Nov 11, 2021
Authored by Valentin Lobstein, Lucas Schnell

This is another variant of the Apache HTTP server version 2.4.50 remote code execution exploit.

tags | exploit, remote, web, code execution
advisories | CVE-2021-41773, CVE-2021-42013
SHA-256 | 1aab010960ead5e3662859fd06680b20932ece6ecf7a7c80a05437497896bb8f
Apache 2.4.49 / 2.4.50 Traversal / Remote Code Execution
Posted Oct 25, 2021
Authored by Dhiraj Mishra, Ramella Sebastien, Ash Daulton | Site metasploit.com

This Metasploit module exploits an unauthenticated remote code execution vulnerability which exists in Apache version 2.4.49 (CVE-2021-41773). If files outside of the document root are not protected by ‘require all denied’ and CGI has been explicitly enabled, it can be used to execute arbitrary commands. This vulnerability has been reintroduced in the Apache 2.4.50 fix (CVE-2021-42013).

tags | exploit, remote, arbitrary, cgi, root, code execution
advisories | CVE-2021-41773, CVE-2021-42013
SHA-256 | a75779abdd3a9f2a319a34c0efbba4f95b420f39624081c3a13752641b7c8d6d
Apache HTTP Server 2.4.49 Path Traversal / Remote Code Execution
Posted Oct 6, 2021
Authored by Lucas Souza

Apache HTTP Server version 2.4.49 suffers from a path traversal vulnerability.

tags | exploit, web, file inclusion
advisories | CVE-2021-41773
SHA-256 | 4eccc2583086d9890750a8b83bcb7c04d9c447598c4297ae1b910acd7f05acb5
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