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Category:   Application (Web Server/CGI)  >   IBM iNotes and Domino Vendors:   IBM
Lotus Notes/Domino Square Bracket Encoding Failure Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1011779
SecurityTracker URL:  http://securitytracker.com/id/1011779
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 19 2004
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): R6
Description:   An input validation vulnerability was reported in Lotus Notes/Domino in the processing of computed values containing square brackets. A remote user can conduct cross-site scripting attacks.

Juan C Calderon reported that the Lotus Notes HTML encoding function fails to encode square brackes ('[' and ']'). 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 site running the Notes/Domino 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 URL is provided:

http://[target]/FormReflectingURLValue?OpenForm&Field=[<script>.....</script>]

The exploit does not work in editable fields.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Notes/Domino 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.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.ibm.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), Windows (NT), Windows (2000)

Message History:   None.


 Source Message Contents

Subject:  IBM Lotus Notes/Domino fails to encode Square Brackets ( [ ] )




Software:
IBM Lotus Notes/Domino

Affected Version(s):
Tested in R6 should work in prior versions as well.

Author:
Juan C Calderon

Description:
An attacker can bypass native Lotus Notes HTML encoding in a computed value by adding square brackets to the beginning and end of
 a field of the following types computed, computed for display, computed when composed or a "computed text" element, Injecting HTML
 and JavaScript as desired.

NOTE: This won't work in editable fields

Trivial Example:
http://www.SomeLotusSite.com/FormReflectingURLValue?OpenForm&Field=[&lt;script&gt;.....&lt;/script&gt;]

Solution:
Validate user input for square bracket characters ( [ ] )  in data shown directly or indirectly in computed fields/texts

 
 


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