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Websense Data Security Cross Site Scripting

Websense Data Security Cross Site Scripting
Posted Mar 19, 2015
Authored by Han Sahin

It was discovered that the Websense Data Security block page processes user-controllable data insecurely, rendering the block page vulnerable to cross site scripting.

tags | exploit, xss
SHA-256 | f3ceee1d1b8d8314759c25514da344340d509358c90fe5b334a3fee4673a6305

Websense Data Security Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting vulnerability in Websense Data Security block page
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Han Sahin, September 2014

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Abstract
------------------------------------------------------------------------
It was discovered that the Websense Data Security block page processes
user-controllable data insecurely, rendering the block page is
vulnerable to Cross-Site Scripting. Cross-Site Scripting allows an
attacker to perform a wide variety of actions, such as stealing the
victim's session token or login credentials, performing arbitrary
actions on the victim's behalf, and logging their keystrokes.

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Tested versions
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This issue was discovered on Websense Triton v7.8.3 and Websense
appliance modules V-Series v7.7. Other versions may be affected as well.

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Fix
------------------------------------------------------------------------
This issue is resolved in TRITON APX Version 8.0. More information about
the fixed can be found at the following location:
http://www.websense.com/support/article/kbarticle/Vulnerabilities-resolved-in-TRITON-APX-Version-8-0

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://www.securify.nl/advisory/SFY20140910/cross_site_scripting_vulnerability_in_websense_data_security_block_page.html

In order to exploit this vulnerability a valid ws-session is required. The payload has to be Base64 encoded, submitted to the block page via the ws-encdata URL parameter. For example, the following parameters can be submitted to the block page.

ws-session=18446744072585574752&ws-userip=1.2.3.4--><iframe>0&ws-cat=76&ws-reason=1029

The above parameters must then be encoded with Base64 and appended to the following URL:

http://<target>:15871/cgi-bin/moreBlockInfo.cgi?ws-encdata=<payload>

An attacker must trick victims into opening the attacker's specially crafted link. This is for example possible by sending a victim a link in an email or instant message. Once a victim opens the specially crafted link, arbitrary client-side scripting code will be executed in the victim's browser. The attacker-supplied code can perform a wide variety of actions, such as stealing the victim's session tokens or login credentials, performing arbitrary actions on their behalf, logging their keystrokes.
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