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Squid Proxy Cache Security Update Advisory SQUID-2016:8
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Advisory ID: SQUID-2016:8
Date: May 06, 2016
Summary: Header smuggling issue
in HTTP Request processing
Affected versions: Squid 1.x -> 3.5.17
Fixed in version: Squid 3.5.18
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http://www.squid-cache.org/Advisories/SQUID-2016_8.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4554
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Problem Description:
Due to incorrect input validation Squid is vulnerable to a header
smuggling attack leading to cache poisoning and to bypass of
same-origin security policy in Squid and some client browsers.
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Severity:
This problem allows a client to smuggle Host header value past
same-origin security protections to cause Squid operating as
interception or reverse-proxy to contact the wrong origin
server. Also poisoning any downstream cache which stores the
response.
However, the cache poisoning is only possible if the caching
agent (browser or explicit/forward proxy) is not following RFC
7230 processing guidelines and lets the smuggled value through.
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Updated Packages:
This bug is fixed by Squid version 3.5.18
In addition, patches addressing this problem for stable releases
can be found in our patch archives:
Squid 3.1:
<http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID-2016_8.patch>
Squid 3.2:
<http://www.squid-cache.org/Versions/v3/3.2/changesets/SQUID-2016_8.patch>
Squid 3.3:
<http://www.squid-cache.org/Versions/v3/3.3/changesets/SQUID-2016_8.patch>
Squid 3.4:
<http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_8.patch>
Squid 3.5:
<http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_8.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 2.x versions up to and including 2.7.STABLE9 are vulnerable.
All 3.x versions up to and including 3.5.17 are vulnerable.
All 4.x versions are not vulnerable.
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Workaround:
There are no workarounds for this problem.
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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-users@xxxxxxxxxxxxxxx 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 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@xxxxxxxxxxxxxxx mailing list. It is 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:
The vulnerability was reported by Jianjun Chen from Tsinghua
University.
Fixed by Amos Jeffries from Treehouse Networks Ltd.
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Revision history:
2016-04-26 09:29:13 UTC Initial Report
2016-05-02 03:39:35 UTC Patches Released
2016-05-06 13:12:00 UTC Packages Released
2016-05-06 14:46:41 UTC CVE Assignment
2016-05-08 12:45:58 UTC Patches Updated
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END
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