F5 FirePass Input Validation Hole in 'css_exceptions' and 'sql_matchscope' Parameters Permits Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1020205
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SecurityTracker URL: http://securitytracker.com/id?1020205
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CVE Reference: CVE-2008-2637
(Links to External Site)
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Updated: Jun 13 2008
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Original Entry Date: Jun 6 2008
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
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Exploit Included: Yes
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Version(s): 6.0.2, hotfix 3; possibly other versions
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Description: A vulnerability was reported in F5 FirePass. A remote user can conduct cross-site scripting attacks.
Several scripts do not properly filter HTML code from user-supplied input before displaying the input. A remote user can create
a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's
browser. The code will originate from the F5 FirePass device and will run in the security context of that site. As a result, the
code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access
data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
The
'css_exceptions' parameter in '/vdesk/admincon/webyfiers.php' and the 'sql_matchscope' parameter in '/vdesk/admincon/index.php'
are affected.
Some demonstration exploit URLs are provided:
https://[target]/vdesk/admincon/webyfiers.php?
a=css&click=1
&css_exceptions=%22+onfocus%3Dalert%28%26
quot%3BXSS1%26quot%3B%29+foo%3D%22
&save_css_exceptions=Update
https://[target]/vdesk/admincon/index.php?
a=css⊂=sql
&sql_matchscope=%22+onfocus%3Dalert%28%26
quot%3BXSS2%26quot%3B%29+foo%3D%22
&save_sql_matchscope=Update
nnposter reported this vulnerability.
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the F5 FirePass device,
access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.f5.com/products/firepass/ (Links to External Site)
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Cause: Input validation error
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Reported By: nnposter@disclosed.not
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Message History:
None.
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Source Message Contents
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Date: 5 Jun 2008 14:09:57 -0000
From: nnposter@disclosed.not
Subject: F5 FirePass Content Inspection Management XSS
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F5 FirePass Content Inspection Management XSS
Product: F5 FirePass
http://www.f5.com/products/firepass/
The F5 FirePass SSL VPN appliance provides rudimentary web request sanitization for resources exposed
through the appliance via Portal
Access. This Content Inspection feature can be configured and customized through the web management
interface to optimize protection
against cross-site scripting and SQL injection. The "XSS scripting" configuration page eve
n prominently states the following:
"The FirePass can aid in preventing Cross Site Scripting attacks via vulnerable web servers. Thi
s is done by scanning URL arguments
and form POST data sent by users through Web Applications, and blocking the request if it looks susp
icious. Note that the FirePass
user and admin console interfaces are already protected against Cross Site Scripting attacks."
Ironically these very pages contain cross-site scripting vulnerabilities. Specifically, parameter css
_exceptions in page /vdesk/admincon/webyfiers.php
and parameter sql_matchscope in page /vdesk/admincon/index.php are vulnerable due to incorrect handl
ing of quotes. This allows an
attacker to force premature termination of the parameter value and to inject an event handler script
. This injection is permanent
because it is embedded in the parameter value. At the same time it is possible to remove (also perma
nently) the "Update" button on
the web form, which complicates the injection removal.
Examples:
https://(target)/vdesk/admincon/webyfiers.php?
a=css&click=1
&css_exceptions=%22+onfocus%3Dalert%28%26quot%3BXSS1%26quot%3B%29+foo%3D%22
&save_css_exceptions=Update
https://(target)/vdesk/admincon/index.php?
a=css&sub=sql
&sql_matchscope=%22+onfocus%3Dalert%28%26quot%3BXSS2%26quot%3B%29+foo%3D%22
&save_sql_matchscope=Update
The vulnerability has been identified in version 6.0.2, hotfix 3. However, other versions may be also
affected.
Solution:
Users should not browse untrusted sites while logged into the FirePass management interface.
Found by:
nnposter
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