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                            CERT-Renater

                Note d'Information No. 2025/VULN492
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DATE                : 01/08/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Squid versions prior to 6.4.

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https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
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SQUID-2025:1 Buffer Overflow in URN Handling
Critical
yadij published GHSA-w4gv-vw3f-29g3 Jul 31, 2025

Package
squid (Squid)

Affected versions
<6.4

Patched versions
6.4


Description

Due to incorrect buffer management Squid is vulnerable to a
heap buffer overflow and possible remote code execution attack
when processing URN.
Severity:

This problem allows a remote server to perform a Buffer Overflow
attack when delivering URN Trivial-HTTP responses. Potentially
allowing delivery of up to 4KB of Squid allocated heap memory
to the client.

Revealed memory may include security credentials or other
confidential data.
Updated Packages:
This bug is fixed by Squid version 6.4.

In addition, patches addressing this problem for the stable
releases can be found in our patch archives:
Squid 6:

a27bf4b

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 4.14 have not been tested and should be assumed
to be vulnerable.

All Squid-4.x up to and including 4.17 are vulnerable.

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

All Squid-6.x up to and including 6.3 are vulnerable.
Workaround:

Disable URN access permissions.

acl URN proto URN
http_access deny URN
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 StarryNight.

Fixed by The Measurement Factory.
Revision history:

2023-06-24 08:18:55 UTC Fix published
2025-07-01 18:40:24 UTC Initial Report

END


Severity
Critical
9.3/ 10

CVSS v3 base metrics
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

CVE ID
CVE-2025-54574

Weaknesses
Weakness CWE-122


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