TheGreenBow VPN Client Local Stack Overflow Vulnerability

Advisory Content :

TheGreenBow VPN Client Local Stack Overflow Vulnerability - Security
Advisory - SOS-10-001

Release Date. 21-Jan-2010
Vendor Notification Date. 11-Dec-2009
Product. TheGreenBow VPN Client
Platform. Microsoft Windows
Affected versions. 4.65.003, 4.51.001 verified and
possibly others.
Severity Rating. High
Impact. System access
Attack Vector. Local
Solution Status. Vendor patch
CVE reference. Not yet assigned

Details.
TheGreenBow is an IPsec VPN client that sets up a secure channel
for data transport.

TheGreenBow VPN Client is vulnerable to a local stack based buffer
overflow, which can lead to the compromise of a vulnerable system.

The vulnerability is caused due to a boundary error when processing
certain sections of tgb (policy) files. Passing an overly long
string to "OpenScriptAfterUp" will trigger the overflow.

Successful exploitation results in the execution of arbitrary code.

Solution.
A patch is available from the vendor (unverified) and will be
included in the next release.

Discovered by.
Brett Gervasoni from SOS Labs.
About us.
Sense of Security is a leading provider of information security and risk
management solutions. Our team has expert skills in assessment and
assurance, strategy and architecture, and deployment through to ongoing
management. We are Australia's premier application penetration testing firm

and trusted IT security advisor to many of the countries largest
organisations.

Sense of Security Pty Ltd

Level 3, 66 King St
Sydney NSW 2000
AUSTRALIA

T: +61 (0)2 9290 4444
F: +61 (0)2 9290 4455
W: http://www.senseofsecurity.com.au/consulting/penetration-testing
E: info (at) senseofsecurity.com (dot) au [email concealed]
Twitter: ITsecurityAU

The latest version of this advisory can be found at:

http://www.senseofsecurity.com.au/advisories/SOS-10-001.pdf

Other Sense of Security advisories can be found at:

http://www.senseofsecurity.com.au/research/it-security-advisories.php

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TheGreenBow VPN Client Local Stack Overflow Vulnerability