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Squid Proxy Cache Security Update Advisory SQUID-2016:11
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Advisory ID: SQUID-2016:11
Date: Dec 16, 2016
Summary: Information disclosure
in HTTP Request processing.
Affected versions: Squid 2.6 -> 2.7.STABLE9
Squid 3.1 -> 3.5.22
Squid 4.0 -> 4.0.16
Fixed in version: Squid 4.0.17, 3.5.23
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http://www.squid-cache.org/Advisories/SQUID-2016_11.txt
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Problem Description:
Due to incorrect HTTP conditional request handling Squid can
deliver responses containing private data to clients it should
not have reached.
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Severity:
This problem allows a remote attacker to discover private and
sensitive information about another clients browsing session.
Potentially including credentials which allow access to further
sensitive resources.
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Updated Packages:
This bug is fixed by Squid version 3.5.23 and 4.0.17.
In addition, patches addressing this problem can be found in our
patch archives:
Squid 3.1:
<http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID-2016_11.patch>
Squid 3.2:
<http://www.squid-cache.org/Versions/v3/3.2/changesets/SQUID-2016_11.patch>
Squid 3.3:
<http://www.squid-cache.org/Versions/v3/3.3/changesets/SQUID-2016_11.patch>
Squid 3.4:
<http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_11.patch>
Squid 3.5:
<http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_11.patch>
Squid 4.0:
<http://www.squid-cache.org/Versions/v4/changesets/SQUID-2016_11.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 Squid-2.x versions are not vulnerable.
All Squid-3.0 are not vulnerable.
All Squid-3.1 versions up to and including 3.1.9 are not
vulnerable.
All Squid-3.1 versions 3.1.10 and later are vulnerable.
Squid-3.2.0.1 and 3.2.0.2 are not vulnerable.
All Squid-3.2 versions 3.2.0.3 and later are vulnerable.
All Squid-3.3 versions are vulnerable.
All Squid-3.4 versions are vulnerable.
All Squid-3.5 versions up to and including Squid-3.5.22 are
vulnerable.
All Squid-4.0 versions up to and including Squid-4.0.16 are
vulnerable.
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Workaround:
The only workaround known is to disable caching, including
memory cache. In squid.conf set:
cache deny all
cache_mem 0
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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-users@xxxxxxxxxxxxxxxxxxxxx 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-bugs@xxxxxxxxxxxxxxxxxxxxx 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 issue was reported by Saulius Lapinskas from Lithuanian
State Social Insurance Fund Board.
Fixed by Garri Djavadyan from iPlus LLC (Comnet ISP).
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Revision history:
2014-12-30 12:44:32 UTC Initial Report
2016-12-16 18:37:00 UTC Packages Released
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END
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