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Citrix Access Gateway Plug-in For Windows nsepacom Buffer Overflow

Citrix Access Gateway Plug-in For Windows nsepacom Buffer Overflow
Posted Aug 1, 2012
Authored by Dmitriy Pletnev | Site secunia.com

Secunia Research has discovered a vulnerability in Citrix Access Gateway Plug-in for Windows, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused by a boundary error in the nsepacom ActiveX control (nsepa.exe) when processing HTTP responses based on the request via the "StartEpa()" method. This can be exploited to cause a heap-based buffer overflow via an overly long "CSEC" HTTP response header. Successful exploitation allows execution of arbitrary code. Citrix Access Gateway Plug-in for Windows version 9.3.49.5 is affected.

tags | advisory, web, overflow, arbitrary, activex
systems | windows
advisories | CVE-2011-2592
MD5 | 1bc295b946271ecd2579f8f939622ef7

Citrix Access Gateway Plug-in For Windows nsepacom Buffer Overflow

Change Mirror Download
====================================================================== 

Secunia Research 01/08/2012

- Citrix Access Gateway Plug-in for Windows -
- "nsepacom" ActiveX Buffer Overflow Vulnerability -

======================================================================
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

======================================================================
1) Affected Software

* Citrix Access Gateway Plug-in for Windows version 9.3.49.5.

NOTE: Other versions may also be affected.

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

Rating: Highly critical
Impact: System access
Where: From remote

======================================================================
3) Vendor's Description of Software

"Citrix Access Gateway Plug-in is client software for Windows XP and
Windows Vista (32-bit) that enables secure connectivity through
Access Gateway, Enterprise Edition."

Product Link:
http://www.citrix.com/site/ss/downloads/details.asp?downloadId=
1535878&productId=15005

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

Secunia Research has discovered a vulnerability in Citrix Access
Gateway Plug-in for Windows, which can be exploited by malicious
people to compromise a user's system.

The vulnerability is caused by a boundary error in the nsepacom
ActiveX control (nsepa.exe) when processing HTTP responses based on
the request via the "StartEpa()" method. This can be exploited to
cause a heap-based buffer overflow via an overly long "CSEC" HTTP
response header.

Successful exploitation allows execution of arbitrary code.

======================================================================
5) Solution

No official solution is currently available.

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

19/07/2011 - Vendor notified.
21/07/2011 - Vendor response.
20/01/2012 - Requested status update.
08/02/2012 - Vendor response, fix not scheduled.
09/05/2012 - Requested status update.
09/05/2012 - Vendor response, fix scheduled for June.
03/07/2012 - Requested status update.
21/07/2012 - Vendor response, fix delayed.
01/08/2012 - Public disclosure.

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

Discovered by Dmitriy Pletnev, Secunia Research.

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

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2011-2592 for the vulnerability.

======================================================================
9) About Secunia

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

http://secunia.com/advisories/business_solutions/

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/advisories/

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://secunia.com/secunia_research/

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

http://secunia.com/corporate/jobs/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/advisories/mailing_lists/

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

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2012-27/

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

======================================================================


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