SQUID-2007:1 Squid-2.6 denial of service

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      Squid Proxy Cache Security Update Advisory SQUID-2007:1
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Advisory ID:            SQUID-2007:1
Date:                   March 20, 2007
Summary:                Denial of service in TRACE method processing
Affected versions:      Squid 2.6
Fixed in version:       Squid 2.6.STABLE12
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     http://www.squid-cache.org/Advisories/SQUID-2007_1.txt
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Problem Description:

 Due to an internal error Squid-2.6 is vulnerable to a denial
 of service attack when processing the TRACE request method.

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Severity:

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

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Updated Packages:

 This bug is fixed by Squid version 2.6.STABLE12

 In addition, a patch addressing this problem can be found In
 our patch archive for version Squid-2.6:

   http://www.squid-cache.org/Versions/v2/2.6/changesets/11349.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-2.6 versions up to, and including 2.6.STABLE11 are
 vulnerable.

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Workarounds:

 To work around the problem deny access to using the TRACE method
 by inserting the following two lines before your first
 http_access rule

     acl TRACE method TRACE
     http_access deny TRACE
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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 [email protected] mailing list is your primary
 support point. See <http://www.squid-cache.org/mailing-lists.html>
 for subscription details.

 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
 [email protected] 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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Revision history:

 2007-03-20 22:45 GMT Initial version
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