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Squid Proxy Cache Security Update Advisory SQUID-2025:1
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Advisory ID: | SQUID-2025:1, CVE-2025-54574
Date: | August 1, 2025
Summary: | Buffer Overflow in URN Handling
Affected versions: | Squid 2.x -> 2.7.STABLE9
| Squid 3.x -> 3.5.28
| Squid 4.x -> 4.17
| Squid 5.x -> 5.9
| Squid 6.x -> 6.3
Fixed in version: | Squid 6.4
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Problem Description:
Due to incorrect buffer management Squid is vulnerable to a
heap buffer overflow and possible remote code execution attack
when processing URN.
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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.
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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:
<https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988>
If you are using a prepackaged version of Squid then please refer
to the package vendor for availability information on updated
packages.
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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.
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Workaround:
Disable URN access permissions.
acl URN proto URN
http_access deny URN
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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 <[email protected]> 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
<[email protected]> 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.
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Credits:
This vulnerability was discovered by StarryNight.
Fixed by The Measurement Factory.
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Revision history:
2023-06-24 08:18:55 UTC Fix published
2025-07-01 18:40:24 UTC Initial Report
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END
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