From securityzone@macromedia.com Thu Jul 14 19:39:14 2005 From: Macromedia Security Zone To: jericho@attrition.org Date: Thu, 14 Jul 2005 16:36:47 -0700 (PDT) Subject: Macromedia Security Bulletin - JRun 4.0 Token Collision ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ MPSB05-05 - Security Patch available for JRun 4.0 token collision. Originally posted: July 14, 2005 http://www.macromedia.com/go/mpsb05-05 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Summary: Under high load, JRun may generate two sessions with the same authentication token. This cannot be controlled by an attacker and it occurs very rarely, but it may cause two authenticated users to share information from a single user session. ~~~~~~~ Solution: Macromedia has released a JRun 4.0 patch that can be downloaded and applied. This only affects products based on the JRun 4 server (listed below). Download JRun 4.0 patch (ZIP, 9 KB): http://www.macromedia.com/go/mpsb05-05 ~~~~~~~ Affected Software Versions: ColdFusion MX 7.0 Enterprise Multi-Server Edition ColdFusion MX 6.1 Enterprise with JRun JRun 4.0 ~~~~~~~ Severity Rating: Macromedia categorizes this issue as a moderate issue and recommends users immediately evaluate their configuration. ~~~~~~~ Details: When a user is authenticated, JRun generates an internal authentication token to track a user's information (principal, credentials, etc.). Under load, it's possible two users can obtain the same token number and shared session information. Macromedia has received a report of this occurring in a production system, but it happens very infrequently, and there is no way for an attacker to cause or control a collision. The patch modifies the authentication token generation algorithm to prevent generation of duplicate tokens. ~~~~~~~ Making the Changes: NOTE: Back up your existing files before making changes. As always, test the changes in a non-production environment before applying the changes to production servers. JRun 4.0 or ColdFusion MX 7.0 Multi-Server Edition: 1. Download the patch above and expand it. 2. Stop all JRun servers. 3. Place the jrun-hotfix-MPSB05-05.jar in the {jrun_root}/servers/lib directory. 4. Restart JRun. ColdFusion MX 7.0 Enterprise or ColdFusion MX 6.1 Enterprise Edition (For ColdFusion 6.1, Updater 1 is required): 1. Download the patch above, and expand it. 2. Stop ColdFusion MX. 3. Place the jrun-hotfix-MPSB05-05.jar in the {cf_root}/runtime/servers/lib directory. 4. (Create the {cf_root}/runtime/servers/lib directory if it does not exist.) On Unix Systems Only: 1. Edit the file {cf_root}/runtime/bin/jvm.config. 2. Find the JVM classpath section. 3. Add {application.home}/runtime/servers/lib as the first entry in the java.class.path list. Example: JVM classpath java.class.path={application.home}/runtime/servers/lib, {application.home}/runtime/../../src,{application.home}/lib/ cfusion.jar,{application.home}/runtime/lib/webservices.jar 4. Start ColdFusion MX NOTE: This patch will be incorporated into ColdFusion MX 7.0 Updater 1 and JRun 4.0 Updater 6. ~~~~~~~ Acknowledgements: Macromedia would like to thank Greg Ball from the University of Virginia for reporting this vulnerability and for working with us to help protect our customers' security. ~~~~~~~ Revisions: July 14, 2005 ~W Bulletin first created. ~~~~~~~ Reporting Security Issues: Macromedia is committed to addressing security issues and providing customers with the information on how they can protect themselves. If you identify what you believe may be a security issue with a Macromedia product, please send an e-mail to secure@macromedia.com. We will work to appropriately address and communicate the issue. ~~~~~~~ Receiving Security Bulletins: When Macromedia becomes aware of a security issue that we believe significantly affects our products or customers, we will notify customers when appropriate. Typically this notification will be in the form of a security bulletin explaining the issue and the response. Macromedia customers who would like to receive notification of new security bulletins when they are released can sign up for our security notification service. For additional information on security issues at Macromedia, please visit: http://www.macromedia.com/security. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ANY INFORMATION, PATCHES, DOWNLOADS, WORKAROUNDS OR FIXES PROVIDED BY MACROMEDIA IN THIS BULLETIN ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. 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