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zonelabsFilter.txt

zonelabsFilter.txt
Posted Nov 12, 2004
Authored by Paul Kurczaba

By using hex encoded characters, it is possible to bypass the Zone Labs IMsecure and IMsecure Pro Active Link filters in versions prior to 1.5.

tags | exploit
SHA-256 | 9ad480fc1508982f331ebe96771a14724dd47832f298d852b8a5ffb68d6e8b94

zonelabsFilter.txt

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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

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