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COMPASS SECURITY ADVISORY http://www.csnc.ch/

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Product: NetWeaver, Web Dynpro Java (BC-WD-JAV)

Vendor: SAP

Subject: Multiple XSS, HTML Injection

Risk: Medium

Effect: Remotely exploitable

Author: Cyrill Brunschwiler ([email protected])

Date: June, 17th 2007

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Introduction:

Compass Security discovered a web application security flaw (XSS) in the
SAP Web Dynpro Java (BC-WD-JAV) running in either the testing or
development mode.

Vulnerable:

SAP NetWeaver Nw04 SP15 to SP 19
SAP NetWeaver Nw04s SP7 to SP 11

Not vulnerable:

Customers which run their system in production mode.

SAP Java Technology Services 640 SP20
SAP Web Dynpro Runtime Core Components 700 SP12

Vulnerability Management:

January 2007: Vulnerability found
January 2007: SAP Security notified
February 2007: SAP confirmation
April/May 2007: Patches available
June 2007: Compass Security Information

SAP Information Policy:

The information is available to registered SAP clients only (SAP
Security Notes)

Patches:

Apply the latest Web Dynpro patch according to the related notes. (See
SAP Note No. 1045640, 946608).

Description

The NetWeaver Application includes the User-Agent-Header content in the
server response body without applying proper encoding. Exploiting the
vulnerability will require an attacker to spoof the User-Agent-Header.
Abusing technologies such as JavaScript or Flash will allow conducting
such an attack.

XSS Ref: http://en.wikipedia.org/wiki/Cross-site_scripting

Cross-site scripting (XSS) is a type of computer security vulnerability
typically found in web applications which allow code injection by
malicious web users into the web pages viewed by other users. Examples
of such code include HTML code and client-side scripts. An exploited
cross-site scripting vulnerability can be used by attackers to bypass
access controls such as the same origin policy. Recently,
vulnerabilities of this kind have been exploited to craft powerful
phishing attacks and browser exploits. Cross-site scripting was
originally referred to as CSS, although this usage has been largely
discontinued.