[squid-announce] [ADVISORY] SQUID-2016:11 - Information disclosure in HTTP Request processing

[Amos Jeffries]

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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 at 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-bugs at 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 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