SiteScape forum prior 7.3 Cross Site Scripting

2007.07.20
Credit: Marc Ruef
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 2.6/10
Impact Subscore: 2.9/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

SiteScape forum prior 7.3 Cross Site Scripting scip AG Vulnerability ID 3159 (07/13/2007) http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=3159 I. INTRODUCTION SiteScape forum is a commercial web forum. It uses presence to connect teams through phone, IM, chat, SMS and email, as well as voice- and web-conferencing. The application also supports online threaded discussions and creation of content through blogs, wikis and workflow-driven document and task management. More information is available at the official web site at the following URL: http://www.sitescape.com/ II. DESCRIPTION Marc Ruef at scip AG found an input validation error within SiteScape Forum prior release 7.3. Some scripts that are not protected by any authentication procedure can be used to run arbitrary script code within a cross site scripting attack. Other parts of the application might be affected too. III. EXPLOITATION Classic script injection techniques and unexpected input data within a browser session can be used to exploit this vulnerabilities. The simple approach to verify an insecure installation is within the login procedure. Use the following string as user name and a wrong passwort for the simple proof-of-concept[1]: <script>alert('scip');</script> A plugin for our open-source exploiting framework "Attack Tool Kit" (ATK) will be published in the near future. [2] IV. IMPACT Because non-authenticated parts of the software are affected, these vulnerabilities are serious for every secure environment. Non-authenticated users might be able to exploit this flaw to gain elevated privileges (e.g. extracting sensitive cookie information or launch a buffer overflow attack against another web browser). Because other parts of the application might be affected too - this could include some second order vulnerabilities - a severe attack scenario might be possible. V. DETECTION Detection of web based attacks requires a specialized web proxy and/or intrusion detection system. Patterns for such a detection are available and easy to implement. VI. SOLUTION We have informed SiteScape on a very early stage. They told us that the problem was not announced within a public advisory. But it is already solved within the latest release of the discussed software. Therefore, an upgrade to SiteScape Forum 7.3 or newer will solve the issues. VII. VENDOR RESPONSE SiteScape has been informed a first time at 06/29/2007 via email at info-at-sitescape.com. A very kind reply by Chris Pressley came back some minutes later. Further discussion of the flaw (how to reproduce) and the co-ordination of a public advisory was made. 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=3159 computec.ch document data base (german) http://www.computec.ch/download.php Die Kunst des Penetration Testing (german) http://www.amazon.de/dp/3936546495/ IX. DISCLOSURE TIMELINE 06/27/07 Identification of the vulnerabilities 06/29/07 First response to info-at-sitescape.com 06/29/07 Immediate reply by Chris Pressley 07/09/07 Co-ordination of the advisory release 07/13/07 Public advisory IX. CREDITS The vulnerabilities were discovered by Marc Ruef. Marc Ruef, scip AG, Zuerich, Switzerland maru-at-scip.ch http://www.scip.ch/ A1. BIBLIOGRAPHY [1] http://www.amazon.de/dp/3936546495/ [2] http://www.computec.ch/projekte/atk/ 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.


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