Secunia Research: Blue Coat K9 Web Protection "Referer" Header Buffer Overflow

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                     Secunia Research 31/07/2008

  - Blue Coat K9 Web Protection "Referer" Header Buffer Overflow -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Blue Coat K9 Web Protection 3.2.44 with Filter version 3.2.32.

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System compromise
Where:  Remote

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3) Vendor's Description of Software 

"K9 Web Protection is our free Internet filtering and control solution
for the home. K9 puts YOU in control of the Internet so you can 
protect your kids.".

Product Link:
http://www.k9webprotection.com/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in K9 Web Protection,
which can be exploited by malicious people to compromise a user's
system.

The vulnerability is caused by a boundary error in the filter service
(k9filter.exe) during processing of "Referer" headers when the 
web-based K9 Web Protection Administration interface is accessed. This
can be exploited to cause a stack-based buffer overflow via an overly
long "Referer:" header.

Successful exploitation allows execution of arbitrary code when a user
e.g. visits a malicious web site.

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5) Solution 

The vendor is reportedly working on a fixed version, which may be
available shortly.

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6) Time Table 

29/06/2007 - Vendor notified via e-mail.
03/07/2007 - Vendor notified via online support form.
05/07/2007 - Vendor response.
25/09/2007 - Vendor informs that fix will be implemented in next
             release scheduled for December 2007.
04/12/2007 - Vendor informs that release of fixed version is pushed to 
             February 2008.
18/01/2008 - Contacted by QA Manager and offered to test beta release.
22/01/2008 - Vendor contacted to acknowledge that vulnerability is 
             fixed in beta release.
03/03/2008 - Vendor informs that scheduled ship date was missed due to 
             stability issues in fixed version.
13/05/2008 - Status update requested.
16/05/2008 - Vendor informs that ship date is set to end of July 2008.
             Vendor also states that customer impact is considered
             minimal as exploitation requires access to the user's
             system.
19/05/2008 - Vendor contacted, clarifying remote attack vector of the
             vulnerability, which only requires convincing the user to
             visit a malicious web site that redirects to the local
             interface.
17/07/2008 - Status update requested. Vendor informed that disclosure
             date will not be pushed again as coordination now has 
             taken more than a year from initial vulnerability report.
31/07/2008 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2007-2952 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
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individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
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security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

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http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-61/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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