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Category:   Application (Generic)  >   Apache Struts Vendors:   Apache Software Foundation
Struts Input Validation Hole in Error Message Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1015257
SecurityTracker URL:  http://securitytracker.com/id/1015257
CVE Reference:   CVE-2005-3745   (Links to External Site)
Date:  Nov 23 2005
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.2.7, running on WebLogic 8.1 SP4 and SP5 and on Resin Web Server
Description:   A vulnerability was reported in Struts. A remote user can conduct cross-site scripting attacks.

An error processing script does 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 site running the Struts 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 non-existent Struts action URL will trigger the flaw.

Irene Abezgauz of Hacktics Ltd. reported this vulnerability.

The original advisory is available at:

http://www.hacktics.com/AdvStrutsNov05.html

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Struts 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:   The vendor has issued a fixed version (1.2.8), available at:

http://struts.apache.org/acquiring.html

Vendor URL:  struts.apache.org/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 11 2006 (Red Hat Issues Fix) Struts Input Validation Hole in Error Message Permits Cross-Site Scripting Attacks
Red Hat has released a fix for Red Hat Enterprise Linux 3.
Mar 7 2006 (Red Hat Issues Fix) Struts Input Validation Hole in Error Message Permits Cross-Site Scripting Attacks
The vendor has released a fix for Red Hat Application Server v2.



 Source Message Contents

Subject:  [Full-disclosure] Security Advisory: Struts Error Message Cross

Background
==========
Struts is an open source framework for building web applications. The
core of the Struts framework is a flexible control layer based on
standard technologies such as Java Servlets, JavaBeans, resource
bundles, and the Extensible Markup Language (XML). Struts can be used
with different Java engines, such as WebLogic, TomCat, JRun, etc.

Scope
=====
After identifying in Struts an error message echoing the path back to
the user, Hacktics has conducted a research of identifying a cross site
scripting vulnerability in the implementation of this error on different
application servers.

The Finding
===========
When attempting to access a non existent Struts action URL (including
the Struts URL suffix, e.g. .do), the struts request handler generates
an error echoing the path of the requested action. The mechanism
generating this error does not perform sufficient input validation nor
perform HTML encoding of the output, thus exposing the system, in some
environments, to a Cross Site Scripting attack.

For detailed description and exploit please visit
http://www.hacktics.com/AdvStrutsNov05.html

Versions Tested
===============
Vulnerable
	Struts 1.2.7 Running on WebLogic 8.1 SP4
	Struts 1.2.7 Running on WebLogic 8.1 SP5
	Struts 1.2.7 Running on Resin Web Server
Non Vulnerable
	Struts Running on Apache Tomcat 5.5.9
	Struts Running on Apache Tomcat 5.5.12

Solution
========
The Apache Struts group has been notified of this vulnerability on
November 3rd, and has fixed the problem in the new Struts release
(1.2.8). Upgrading to the new version will eliminate the threat.
Alternatively, a work around is available on existing versions by
configuring the web server to display custom error messages rather than
the default ones.



-----------------------
Irene Abezgauz
Application Security Consultant
Hacktics Ltd.
Mobile: +972-54-6545405
Web: http://www.hacktics.com

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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