Sun Secure Global Desktop prior 4.3 multiple remote vulnerabilities scip AG Vulnerability ID 2555 (09/21/2006) http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2555 I. INTRODUCTION Sun Secure Global Desktop (SSGD, formerly known as Tarantella[1]) is an open-source remote desktop solution with a basic amount of security. More information is available at the official product demo web site at the following URL: https://sgddemo.sun.com/ II. DESCRIPTION Marc Ruef at scip AG found six undisclosed web-based vulnerabilities in Sun Secure Global Desktop prior 4.3. These can be divided into two classes: 1. Cross site scripting Some scripts that are not protected by any authentication procedure can be used to run arbitrary script code within a cross site scripting attack. 2. Revealing of sensitive information Some scripts that are not protected by any authentication procedure can be accessed to reveal sensitive information (e.g. internal hostnames, applied software version, details about settings) about the target host. III. EXPLOITATION Classic script injection techniques and unexpected input data within a browser session can be used to exploit these vulnerabilities. A plugin for the open-source exploiting framework "Attack Tool Kit" (ATK) will be published in the near future. [2] We are not going to publish any further technical details or an exploit suite due to Sun has not published any patches as far as we know. See vendor response and disclosure timeline for further details. IV. IMPACT Because non-authenticated parts of the software are affected, this vulnerabilities are serious for every secure environment. Non-authenticated users might be able to exploit the flaws to gain elevated privileges (e.g. extracting sensitive cookie information or launch a buffer overflow attack against another web browser). 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 sun on a very early stage. They said that the problems will be addressed with a bugfix for the currently shipping version 4.2 and will no longer be existing in the upcoming version 4.3. We were told that the public release for the patch is at the end of August 2006. Due to no public release was made and our last emails were not answered, we do not know what kind of official solution is available. This is why we are not going to publish any technical details or exploits at the moment. De-activate the following scripts to gain a higher level of security: - ttaarchives.cgi - ttaAuthentication.jsp - ttalicense.cgi - ttawlogin.cgi - ttawebtop.cgi - ttaabout.cgi - test-cgi VII. VENDOR RESPONSE Sun Microsystems Inc. has been informed a first time at 07/04/2006 via email to contactus-at-sun.com. Because no reply came back we decided to send a forwarding at 07/18/2006 to security-alert-at-sun.com. A first response came back on the same day. Several email messages were exchanged to discuss the vulnerabilities and to co-ordinate the disclosure of this advisory. However, the last emails since 09/15/2006 have not been answered. 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=2555 computec.ch document data base (german) http://www.computec.ch/download.php?list.26 IX. DISCLOSURE TIMELINE 06/06/06 Identification of the vulnerabilities 07/04/06 First information to contactus-at-sun.com 07/18/06 Second information to security-alert-at-sun.com 09/15/06 Sending the last email which is still unanswered 09/21/06 Public disclosure of this 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://news.com.com/Sun+to+buy+Tarantella/2100-1012_3-5701487.html [2] http://www.computec.ch/projekte/atk/ A2. LEGAL NOTICES Copyright (c) 2006 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.