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Websense Policy Filtering Bypass (User-Agent)
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SUMMARY
By spoofing the User-Agent header it is possible to bypass filtering and,
to a lesser extent, monitoring in a Websense Enterprise.
DETAILS
Vulnerable Systems:
* Websense Enterprise version 6.3.1
The following was tested in an unpatched 6.3.1 system using the ISA Server
integration product. It is assumed it will work with other integration
products but this has not been tested. Other User Agents may also work.
I. Install FireFox 2.0.x
II. Obtain and install the User Agent Switcher browser plug-in by Chris
Pederick
III. Add the following User Agents to the plug-in
Description: RealPlayer
User Agent : RealPlayer G2
Description: MSN Messenger
User Agent : MSMSGS
Description: WebEx
User Agent : StoneHttpAgent
IV. Change FireFox's User Agent to any one of the preceding values
V. Browse to a filtered Web site
VI. Content is allowed
Content browsed via this method will be recorded in the Websense database
as being in the "Non-HTTP" category.
Solution:
Websense has corrected the issue in database update 92938 as explained in
article: <http://www.websense.com/SupportPortal/SupportKbs/976.aspx> How
can I ensure that Websense Enterprise filters "all" requests (URL requests
and tunneled protocol requests)?
ADDITIONAL INFORMATION
The information has been provided by <mailto:dink@mrhinkydink.com> Mr.
HinkyDink.
The original article can be found at:
<http://mrhinkydink.blogspot.com/2007/12/websense-policy-filtering-bypass.html>
http://mrhinkydink.blogspot.com/2007/12/websense-policy-filtering-bypass.html
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