zonelabsFilter.txt

`Zone Labs IMsecure Active Link Filter Bypass  
http://www.kurczaba.com/html/security/0410141.htm  
-------------------------------------------------  
  
Overview:  
A vulnerability has been discovered in the Zone Labs IMsecure Active Link Filter  
  
Vendor:  
Zone Labs (http://www.zonelabs.com)  
  
Affected Systems/Configuration:  
Versions of IMsecure and IMsecure Pro prior to 1.5  
  
Vulnerability/Exploit:  
The Active Link filter blocks potentially dangerous URLs in IM messages.  
For example, IMsecure will remove URLs with extensions of .vbs, and .exe. By using hex encoded characters in the file extension of the URL, it is possible to bypass the Active Link filter.  
  
Workaround:  
Upgrade to version 1.5 or higher  
  
Proof of Concept:  
http://www.example.com/somefile.e%78e  
  
In the example above, "78" is hex for "x".In plain English, the URL reads:  
  
http://www.example.com/somefile.exe  
  
Date Discovered:  
April 1, 2004  
  
Fix Available:  
October 12, 2004  
  
Severity:  
Low  
  
Credit:  
Paul Kurczaba  
Kurczaba Associates  
  
`