CVE-2021-41773

Published: 5 October 2021

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.

Priority

CVSS 3 base score: 7.5

Status

Package	Release	Status
apache2 Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	focal	Not vulnerable
	hirsute	Not vulnerable
	impish	Not vulnerable
	jammy	Not vulnerable
	trusty	Not vulnerable
	upstream	Released (2.4.50-1)
	xenial	Not vulnerable

References

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