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Squid Proxy Cache Security Update Advisory SQUID-2023:7 __________________________________________________________________ Advisory ID: | SQUID-2023:7 Date: | December 1, 2023 Summary: | Denial of Service in HTTP Message Processing Affected versions: | Squid 2.2 -> 2.7.STABLE9 | Squid 3.x -> 3.5.28 | Squid 4.x -> 4.17 | Squid 5.x -> 5.9 | Squid 6.x -> 6.4 Fixed in version: | Squid 6.5 __________________________________________________________________ Problem Description: Due to a Buffer Overread bug Squid is vulnerable to a Denial of Service attack against Squid HTTP Message processing. __________________________________________________________________ Severity: This problem allows a remote attacker to perform Denial of Service when sending easily crafted HTTP Messages. CVSS Score of 8.6 <https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H&version=3.1> __________________________________________________________________ Updated Packages: This bug is fixed by Squid version 6.5. In addition, patches addressing this problem for the stable releases can be found in our patch archives: Squid 5 and older: <http://www.squid-cache.org/Versions/v5/SQUID-2023_7.patch> Squid 6: <http://www.squid-cache.org/Versions/v6/SQUID-2023_7.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: All Squid-2.2 up to and including 4.17 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 6.4 are vulnerable. __________________________________________________________________ Workaround: There is no workaround for this issue. __________________________________________________________________ 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-us...@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-b...@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 2023-10-25 19:41:45 UTC Patches Released __________________________________________________________________ END _______________________________________________ squid-announce mailing list squid-announce@lists.squid-cache.org https://lists.squid-cache.org/listinfo/squid-announce