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                                 CERT-Renater

                     Note d'Information No. 2024/VULN055
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DATE                : 24/01/2024

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running SQUID versions prior to 6.6.

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https://github.com/squid-cache/squid/security/advisories/GHSA-j49p-553x-48rx
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SQUID-2023:11 Denial of Service in Cache Manager
Moderate
yadij published GHSA-j49p-553x-48rx Jan 23, 2024


Package
squid

Affected versions
<6.6

Patched versions
6.6


Description

Due to an expired pointer reference bug Squid is vulnerable to a
Denial of Service attack against Cache Manager error responses.
Severity:

This problem allows a trusted client to perform Denial of Service
when generating error pages for Client Manager reports.
Updated Packages:
This bug is fixed by Squid version 6.6.

In addition, patches addressing this problem for the stable
releases can be found in our patch archives:
Squid 5:

http://www.squid-cache.org/Versions/v5/SQUID-2023_11.patch
Squid 6:

http://www.squid-cache.org/Versions/v6/SQUID-2023_11.patch

If you are using a prepackaged version of Squid then please
refer to the package vendor for availability information on
updated packages.


Determining if your version is vulnerable:

Squid older than 5.0.5 have not been tested and should be
assumed to be vulnerable.

All Squid-5.x up to and including 5.9 are vulnerable.

All Squid-6.x up to and including 6.5 are vulnerable.


Workaround:

Prevent access to Cache Manager using Squid's main access
control:

http_access deny manager
Contact details for the Squid project:

For installation / upgrade support on binary packaged versions
of Squid: Your first point of contact should be your binary
package vendor.

If you install and build Squid from the original Squid sources
then the squid-users@lists.squid-cache.org mailing list is your
primary support point. For subscription details see
http://www.squid-cache.org/Support/mailing-lists.html.

For reporting of non-security bugs in the latest STABLE release
the squid bugzilla database should be used
https://bugs.squid-cache.org/.

For reporting of security sensitive bugs send an email to the
squid-bugs@lists.squid-cache.org mailing list. It's a closed
list (though anyone can post) and security related bug reports
are treated in confidence until the impact has been established.
Credits:

This vulnerability was discovered by Joshua Rogers of Opera
Software.

Fixed by The Measurement Factory.


Revision history:

2023-10-12 11:53:02 UTC Initial Report
2023-11-12 09:33:20 UTC Patches Released

END


Severity
Moderate

6.5/ 10

CVSS base metrics

Attack vector
Network

Attack complexity
Low

Privileges required
Low

User interaction
None

Scope
Unchanged

Confidentiality
None

Integrity
None

Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE ID
CVE-2024-23638

Weaknesses
CWE-825



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