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                                    CERT-Renater

                         Note d'Information No. 2009/VULN294
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DATE                      : 28/07/2009

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Squid Proxy Cache.

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http://www.squid-cache.org/Advisories/SQUID-2009_2.txt
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       Squid Proxy Cache Security Update Advisory SQUID-2009:2
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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 -> 3.1.0.11
Fixed in version:       Squid 3.0.STABLE17, 3.1.0.12
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      http://www.squid-cache.org/Advisories/SQUID-2009_2.txt
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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.

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Severity:

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

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Updated Packages:

  Theses bugs are fixed by Squid versions 3.0.STABLE17 and 3.1.0.12

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

Squid 3.0:
  http://www.squid-cache.org/Versions/v3/3.0/changesets/b9070.patch
  http://www.squid-cache.org/Versions/v3/3.0/changesets/b9074.patch
  http://www.squid-cache.org/Versions/v3/3.0/changesets/b9075.patch

Squid 3.1:
  http://www.squid-cache.org/Versions/v3/3.1/changesets/b9654.patch
  http://www.squid-cache.org/Versions/v3/3.1/changesets/b9661.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 unpatched Squid-3.0 versions up to and including 3.0.STABLE16
  are vulnerable.

  All unpatched Squid-3.1 versions up to and including 3.1.0.11 are
  vulnerable.

  Squid-2.x releases are not vulnerable.

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Workarounds:

  None currently known.
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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@squid-cache.org 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@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.

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Credits:

  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.

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Revision history:

  2009-07-27 14:08 GMT Initial version
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