FreeBSD : Apache httpd -- Path Traversal and Remote Code Execution (d001c189-2793-11ec-8fb1-206a8a720317)

critical Nessus Plugin ID 153983



The remote FreeBSD host is missing a security-related update.


The Apache http server project reports :

critical: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) (CVE-2021-42013).

It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. 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 only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.

Acknowledgements: Reported by Juan Escobar from Dreamlab Technologies, Fernando Munoz from NULL Life CTF Team, and Shungo Kumasaka


Update the affected package.

See Also

Plugin Details

Severity: Critical

ID: 153983

File Name: freebsd_pkg_d001c189279311ec8fb1206a8a720317.nasl

Version: 1.7

Type: local

Published: 10/11/2021

Updated: 1/26/2022

Risk Information

CVSS Score Source: CVE-2021-42013


Risk Factor: Critical

Score: 9.4


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:H/RL:OF/RC:C


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:apache24, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/7/2021

Vulnerability Publication Date: 10/7/2021

CISA Known Exploited Dates: 11/17/2021

Exploitable With

Metasploit (Apache 2.4.49/2.4.50 Traversal RCE)

Elliot (Apache 2.4.50 RCE)

Reference Information

CVE: CVE-2021-42013