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


Release Date.                  21-Jan-2010
Last Update.                   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.
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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