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CVE-2023-50269

Published: 14 December 2023

Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
squid
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support)
focal
Released (4.10-1ubuntu1.9)
jammy
Released (5.7-0ubuntu0.22.04.3)
lunar
Released (5.7-1ubuntu3.2)
mantic
Released (6.1-2ubuntu1.2)
trusty Ignored
(end of standard support)
upstream Needs triage

xenial Ignored
(end of standard support)
Patches:
upstream: http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch
upstream: http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch
squid3
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Does not exist

jammy Does not exist

lunar Does not exist

mantic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Needs triage

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H