cisco-input.txt

2007-05-24T00:00:00
ID PACKETSTORM:56925
Type packetstorm
Reporter Marc Ruef
Modified 2007-05-24T00:00:00

Description

                                        
                                            `Cisco CallManager 4.1 Input Validation Vulnerability  
  
scip AG Vulnerability ID 2977 (03/13/2007)  
http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2977  
  
I. INTRODUCTION  
  
Cisco CallManager, short CCM, is a professional voice-over-IP solution  
that tracks active components, including among others phones, gateways,  
conference bridges, transcoding resources and voicemail boxes.  
  
II. DESCRIPTION  
  
Marc Ruef and Stefan Friedli found a web-based vulnerability that was  
identified in Cisco CallManager 4.1 and may affect earlier versions as well.  
  
The web interface of the application fails to properly santisize data  
supplied by the search-form before displaying it back to the user.  
Though several filters are in place to prevent the injection of <script>  
Tags or action handlers such as "onclick" or "onmouseover", it is  
possible to inject html-code including common attributes. This allows  
the embedding of external references, e.g. images or flash resources.  
The vulnerability also allows an attacker to use the "style"-attribute  
on any tag to conduct arbitrary web-based attacks.  
  
Example:  
https://example.com/CCMAdmin/serverlist.asp?findBy=servername&match=begins&pattern=<img%20src='http://www.scip.ch/scip.gif'%20style='border:%201px%20solid%20black;'>  
  
IV. IMPACT  
  
This vulnerability may be exploited by tricking authenticated users into  
clicking a crafted link in order to conduct arbitrary web-based attacks.  
  
V. DETECTION  
  
Detection of web based attacks requires a specialized web proxy and/or  
intrusion detection system. Patterns for detection of basic attacks are  
available and easy to implement, though they may possibly fail on more  
sophisticated attacks.  
  
VI. SOLUTION  
  
Server-side input validation should be improved to prevent the injection  
of unauthorized code. Cisco has taken appropriate steps regarding this  
issue, see vendor response (VII) for details.  
  
VII. VENDOR RESPONSE  
  
A representative of the Cisco Product Security Incident Response Team  
(PSIRT) stated, that this kind of exploitation is blocked by  
improvements to the web application firewall used in CallManager. The  
Cisco PSIRT team has issued a formal security response available at:  
http://www.cisco.com/warp/public/707/cisco-sr-20070523-ccm.shtml.  
  
VIII. SOURCES  
  
scip AG - Security Consulting Information Process (german)  
http://www.scip.ch  
  
scip AG Vulnerability Database (german)  
http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2977  
  
IX. DISCLOSURE TIMELINE  
  
03/13/07 Identification of the vulnerabilities  
03/13/07 Notification of the vendor  
03/14/07 Response from Mark-David McLaughlin [marmclau@cisco.com]  
of the PSIRT  
03/19/07 Status Notification by PSIRT  
03/28/07 Status Notification by PSIRT  
04/18/07 Status Notification by PSIRT  
04/20/07 Status Notification by PSIRT  
05/02/07 Status Notification by PSIRT  
05/05/07 Coordination of public release  
05/16/07 Final Vendor Response received  
05/23/07 Public Release  
  
IX. CREDITS  
  
The vulnerabilities were discovered by Marc Ruef and Stefan Friedli.  
  
Marc Ruef, scip AG, Zuerich, Switzerland  
maru-at-scip.ch  
http://www.scip.ch  
  
Stefan Friedli, scip AG, Zuerich, Switzerland  
stfr-at-scip.ch  
http://www.scip.ch  
  
Thanks to Mark-David McLaughlin (PSIRT) for cooperating.  
  
  
A2. LEGAL NOTICES  
  
Copyright (c) 2007 scip AG, Switzerland.  
  
Permission is granted for the re-distribution of this alert. It may not  
be edited in any way without permission of scip AG.  
  
The information in the advisory is believed to be accurate at the time  
of publishing based on currently available information. There are no  
warranties with regard to this information. Neither the author nor the  
publisher accepts any liability for any direct, indirect or  
consequential loss or damage from use of or reliance on this advisory.  
  
  
`