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Secunia Research: Blue Coat K9 Web Protection Response Handling Buffer Overflows

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                     Secunia Research 31/07/2008

 - Blue Coat K9 Web Protection Response Handling Buffer Overflows -

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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.

====================================================================== 
2) Severity 

Rating: Less critical
Impact: System compromise
Where:  Remote

====================================================================== 
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/

====================================================================== 
4) Description of Vulnerability

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

The vulnerabilities are caused by boundary errors in the filter 
service (k9filter.exe) when handling HTTP version information in 
responses from a centralised server (sp.cwfservice.net). These can be
exploited to cause stack-based buffer overflows via a specially 
crafted response containing overly long HTTP version information.

Successful exploitation allows execution of arbitrary code, but
requires that requests to the centralised server can be redirected to
a malicious service or otherwise intercepted.

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5) Solution 

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

====================================================================== 
6) Time Table 

05/07/2007 - Vendor notified.
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 (vulnerabilities not properly fixed in
             provided beta release).
03/03/2008 - New beta release provided with vulnerabilities fixed.
             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 using e.g. Man-in-the-Middle attacks.
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.

====================================================================== 
7) Credits 

Discovered by Carsten Eiram, Secunia Research.

====================================================================== 
8) References

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

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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
database as a service to the security community and private 
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
do active vulnerability research in order to aid improving the 
security and reliability of software in general:

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

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

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Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

====================================================================== 
10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-64/

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

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