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CVE-2023-49288

Publication date 4 December 2023

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.

Read the notes from the security team

Status

Package Ubuntu Release Status
squid 24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar Ignored end of life, was deferred [2024-01-26]
22.04 LTS jammy
Fixed 5.7-0ubuntu0.22.04.4
20.04 LTS focal
Fixed 4.10-1ubuntu1.12
18.04 LTS bionic Ignored end of standard support
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support
squid3 24.10 oracular Not in release
24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Vulnerable
14.04 LTS trusty Ignored end of standard support

Notes

mdeslaur

need to identify commit in 6.0.1...perhaps this one? https://github.com/squid-cache/squid/commit/836d3c0b158f6e7bc795d1e6d881c873d98728e8 or https://github.com/squid-cache/squid/commit/9358e99f998ace9c4c7a21d510432dde5b7f9cca While this is fixed by a yet unidentified commit in 6.0.1, I believe it is also fixed in a different way by the refactoring in the commit to fix CVE-2023-5824. The issue no longer reproduces with the fix for CVE-2023-5824 applied. Ubuntu 20.04 LTS was patched in USN-6728-1, but the fix introduced crashes and was backed out in USN-6728-2.

Severity score breakdown

Parameter Value
Base score 7.5 · High
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