Squid Proxy Cache Denial of Service in request handling Feb 04 2009 11:53AM
Amos Jeffries (amos treenet co nz)
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Squid Proxy Cache Security Update Advisory SQUID-2009:1
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Advisory ID: SQUID-2009:1
Date: February 02, 2009
Summary: Denial of service in request processing
Affected versions: Squid 2.7 -> 2.7.STABLE5,
Squid 3.0 -> 3.0.STABLE12,
Squid 3.1 -> 3.1.0.4
Fixed in version: Squid 2.7.STABLE6, 3.0.STABLE13, 3.1.0.5
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http://www.squid-cache.org/Advisories/SQUID-2009_1.txt
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Problem Description:

Due to an internal error Squid is vulnerable to a denial
of service attack when processing specially crafted requests.

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Severity:

This problem allows any client to perform a denial of service
attack on the Squid service.

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Updated Packages:

This bug is fixed by Squid versions 2.7.STABLE6, 3.0.STABLE13,
and 3.1.0.5.

In addition, patches addressing this problem can be found In
our patch archives:

Squid 2.7:
http://www.squid-cache.org/Versions/v2/2.7/changesets/12432.patch
http://www.squid-cache.org/Versions/v2/2.7/changesets/12442.patch

Squid 3.0:
http://www.squid-cache.org/Versions/v3/3.0/changesets/b8964.patch
http://www.squid-cache.org/Versions/v3/3.0/changesets/b8965.patch

Squid 3.1:
http://www.squid-cache.org/Versions/v3/3.1/changesets/b9414.patch
http://www.squid-cache.org/Versions/v3/3.1/changesets/b9418.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-2.7 versions up to, and including 2.7.STABLE5 are
vulnerable.

All Squid-3.0 versions up to and including 3.0.STABLE12 are
vulnerable.

All Squid-3.1 beta versions up to and including 3.1.0.4 are
vulnerable.

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Workarounds:

None.
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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) squid-cache (dot) org [email concealed] 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://www.squid-cache.org/bugs/>.

For reporting of security sensitive bugs send an email to the
squid-bugs (at) squid-cache (dot) org [email concealed] 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:

The vulnerability was discovered by Joshua Morin, Mikko Varpiola
and Jukka Taimisto from the CROSS project at Codenomicon Ltd.

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Revision history:

2009-02-02 13:12 GMT Initial version
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