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             AUSCERT External Security Bulletin Redistribution

          Squid Proxy Cache Security Update Advisory SQUID-2009:2
                               30 July 2009


        AusCERT Security Bulletin Summary

Product:           Squid 3.0 -> 3.0.STABLE16
                   Squid 3.1 ->
Publisher:         Squid
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch
CVE Names:         CVE-2009-2621 CVE-2009-2622 

Original Bulletin: 

Revision History:  July 30 2009: CVE Added
                   July 29 2009: CVEs Added
                   July 28 2009: Initial Release

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      Squid Proxy Cache Security Update Advisory SQUID-2009:2

Advisory ID:            SQUID-2009:2
Date:                   July 27, 2009
Summary:                Multiple Remote Denial of service issues
                        in header processing.
Affected versions:      Squid 3.0 -> 3.0.STABLE16,
                        Squid 3.1 ->
Fixed in version:       Squid 3.0.STABLE17,


Problem Description:

 Due to incorrect buffer limits and related bound checks Squid
 is vulnerable to a denial of service attack when processing
 specially crafted requests or responses.

 Due to incorrect data validation Squid is vulnerable to a denial
 of service attack when processing specially crafted responses.



 These problems allow any trusted client or external server to
 perform a denial of service attack on the Squid service.


Updated Packages:

 Theses bugs are fixed by Squid versions 3.0.STABLE17 and

 In addition, patches addressing these problems can be found In
 our patch archives:

Squid 3.0:

Squid 3.1:

 If you are using a prepackaged version of Squid then please refer
 to the package vendor for availability information on updated


Determining if your version is vulnerable:

 All unpatched Squid-3.0 versions up to and including 3.0.STABLE16
 are vulnerable.

 All unpatched Squid-3.1 versions up to and including are

 Squid-2.x releases are not vulnerable.



 None currently known.

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@squid-cache.org mailing list is your primary
 support point. For subscription details see

 For reporting of non-security bugs in the latest STABLE release
 the squid bugzilla database should be used

 For reporting of security sensitive bugs send an email to the
 squid-bugs@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.



 The request vulnerabilities were discovered by Alex Montoanelli
 of www.unetvale.net

 Some response vulnerabilities were discovered by Rob Middleton
 of Centenary Institute.

 Some response vulnerabilities were discovered by Tuomo Untinen,
 Ossi Herrala and Jukka Taimisto from the CROSS project at
 Codenomicon Ltd.


Revision history:

 2009-07-27 14:08 GMT Initial version

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