Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!Close

CVE-2021-42013

Published: 7 October 2021

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.

Notes

AuthorNote
seth-arnold
Ubuntu wasn't vulnerable to CVE-2021-41773 so we did not
deploy the insufficient fix.

Priority

High

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
impish Not vulnerable

jammy Not vulnerable

bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

trusty Not vulnerable

upstream Needs triage

xenial Not vulnerable

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H