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Squid Proxy Cache Security Update Advisory SQUID-2021:5
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Advisory ID:       | SQUID-2021:5
Date:              | May 10, 2021
Summary:           | Denial of Service in HTTP Response Processing
Affected versions: | Squid 2.x -> 2.7.STABLE9
                   | Squid 3.x -> 3.5.28
                   | Squid 4.x -> 4.14
                   | Squid 5.x -> 5.0.5
Fixed in version:  | Squid 4.15, 5.0.6
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Problem Description:

 Due to an input validation bug Squid is vulnerable to a Denial
 of Service against all clients using the proxy.

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Severity:

 This problem allows a remote server to perform Denial of Service
 when delivering HTTP Response messages. The issue trigger is a
 header which can be expected to exist in HTTP traffic without
 any malicious intent by the server.

CVSS Score of 8.8
<https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C/CR:X/IR:X/AR:H/MAV:N/MAC:L/MPR:L/MUI:N/MS:C/MC:X/MI:X/MA:H&version=3.1>

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Updated Packages:

This bug is fixed by Squid versions 4.15 and 5.0.6.

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

Squid 4:
<http://www.squid-cache.org/Versions/v4/changesets/squid-4-1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c.patch>

Squid 5:
<http://www.squid-cache.org/Versions/v5/changesets/squid-5-8af775ed98bfd610f9ce762fe177e01b2675588c.patch>

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

 All Squid-5.x up to and including 5.0.5 are vulnerable.

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Workaround:

 There are no known workarounds to this issue.

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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 <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
 <http://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.

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Credits:

 This vulnerability was discovered by Joshua Rogers of Opera
 Software.

 Fixed by Alex Rousskov of The Measurement Factory.

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Revision history:

 2021-03-05 22:11:43 UTC Initial Report
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END
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