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Squid Proxy Cache Security Update Advisory SQUID-2016:4
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Advisory ID: SQUID-2016:4
Date: April 02, 2016
Summary: Denial of Service issue
in HTTP Response processing.
Affected versions: Squid 3.x -> 3.5.15
Squid 4.x -> 4.0.7
Fixed in version: Squid 4.0.8, 3.5.16
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http://www.squid-cache.org/Advisories/SQUID-2016_4.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3948
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Problem Description:
Due to incorrect bounds checking Squid is vulnerable to a denial
of service attack when processing HTTP responses.
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Severity:
This problem allows a malicious client script and remote server
delivering certain unusual HTTP response syntax to trigger a
denial of service for all clients accessing the Squid service.
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Updated Packages:
This bug is fixed by Squid version 3.5.16 and 4.0.8.
In addition, a patch addressing this problem for the stable
release can be found in our patch archives:
Squid 3.5:
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14016.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:
All unpatched Squid-3.0 versions are vulnerable.
All unpatched Squid-3.1 versions are vulnerable.
All unpatched Squid-3.2 versions are vulnerable.
All unpatched Squid-3.3 versions are vulnerable.
All unpatched Squid-3.4 versions are vulnerable.
All unpatched Squid-3.5 up to and including Squid-3.5.15 are
vulnerable.
All unpatched Squid-4.0 up to and including 4.0.7 are vulnerable.
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Workaround:
There are no good workarounds known for this vulnerability.
The following squid.conf settings can protect Squid-3.5 (only):
acl Vary rep_header Vary .
store_miss deny Vary
Or,
The following squid.conf setting can protect Squid-3.0 or later:
cache deny all
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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 your 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 reported by Santiago R. Rincon of Debian.
Fixed by Amos Jeffries from Treehouse Networks Ltd.
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Revision history:
2016-03-20 11:25:04 UTC Initial Report
2016-04-01 06:15:31 UTC Patch Released
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END
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