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CVE-2021-44224

Published: 20 December 2021

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).

Notes

AuthorNote
mdeslaur
fixed by r1895955+r1896044 in 2.4.x

Priority

Medium

Cvss 3 Severity Score

8.2

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
upstream
Released (2.4.52)
bionic
Released (2.4.29-1ubuntu4.21)
focal
Released (2.4.41-4ubuntu3.9)
hirsute
Released (2.4.46-4ubuntu1.5)
impish
Released (2.4.48-3.1ubuntu3.2)
jammy
Released (2.4.52-1ubuntu1)
Patches:
upstream: https://svn.apache.org/viewvc?view=revision&revision=1895955
upstream: https://svn.apache.org/viewvc?view=revision&revision=1896044
upstream: https://github.com/apache/httpd/commit/a962ba73047b5478d702c8ad09fd1a167e1d3736
upstream: https://github.com/apache/httpd/commit/a0521d289ae14e4ac004811dc1ef91b3e118a2f6

Severity score breakdown

Parameter Value
Base score 8.2
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H