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Squid Proxy Cache Security Update Advisory SQUID-2016:7
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Advisory ID: SQUID-2016:7
Date: May 06, 2016
Summary: Cache poisoning issue
in HTTP Request handling
Affected versions: Squid 3.2.0.11 -> 3.5.17
Squid 4.x -> 4.0.9
Fixed in version: Squid 3.5.18, 4.0.10
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http://www.squid-cache.org/Advisories/SQUID-2016_7.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4553
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Problem Description:
Due to incorrect data validation of intercepted HTTP Request
messages Squid is vulnerable to clients bypassing the protection
against CVE-2009-0801 related issues. This leads to cache
poisoning.
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Severity:
This problem is serious because it allows any client, including
browser scripts, to bypass local security and poison the proxy
cache and any downstream caches with content from an arbitrary
source.
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Updated Packages:
This bug is fixed by Squid version 3.5.18 and 4.0.10.
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-3.5-14039.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:
Use the command 'squid -v' to view version and build details of
your proxy;
All Squid 2.x are not vulnerable.
All Squid-3.x up to and including 3.2.0.10 are not vulnerable.
All Squid-3.2.0.11 and later versions up to and including 3.5.17
are vulnerable.
All Squid-4.x up to and including 4.0.9 are vulnerable.
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Workaround:
Add to squid.conf:
client_dst_passthru off
And,
Remove any use of "host_verify_strict" directive.
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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:
2016-04-15 10:54:39 UTC Initial Report
2016-05-02 10:51:18 UTC Patch Released
2016-05-06 13:12:00 UTC Packages Released
2016-05-06 14:46:41 UTC CVE Assignment
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END
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