EMC Dantz Retrospect 7 Backup client DoS Vulnerability iDefense Security Advisory 03.02.06 http://www.idefense.com/application/poi/display?type=vulnerabilities March 02, 2006 I. BACKGROUND EMC Dantz Retrospect is a network backup client designed for small to mid-sized businesses. Dantz protects millions of computers world wide by providing enterprise class backup protection for servers, notebooks, and business critical applications. More information on this software package can be found on the vendors site: http://www.dantz.com II. DESCRIPTION The Dantz Retrospect 7 backup client listens on TCP port 497 for commands from the central backup server. Sending a specially crafted malformed packet to this socket can force the backup client to terminate. This allows for an unauthenticated attacker to effectively disable the network backup services for a target network. III. ANALYSIS Exploitation appears to be limited to a DoS only condition. From debug log information it appears that the packet corruption is detected by the application which then decides to terminate rather than discard the data. The following type information may be found in debug logs of exploited machines Assertion failure at \retroclient\Win\winutil.c-1201 DebugFail: Client Terminated Retrospect Client Terminated. IV. DETECTION This exploit has been tested with the Dantz Retrospect Client version 7.0.107. This is the latest available on the vendor's website. The version available for Mac is 6.0 has also been tested and is not vulnerable to the issue described in this document. V. WORKAROUND iDefense is unaware of any workaround for this issue. VI. VENDOR RESPONSE "This problem has been resolved in the latest updates to the Retrospect Client for Windows versions 7.0.109 and 6.5.138 software. All customers who use the Retrospect Client Software versions 6.5 or 7 are encouraged to download and install the latest Retrospect Client software, at no additional cost, from the EMC Web site at: http://www.emcinsignia.com/supportupdates/updates/retrospect/archive/ Retrospect Express and Retrospect 7.5 customers do not need this update." The EMC KB article for this issue is found at: http://kb.dantz.com/article.asp?article=8361&p=2 VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 12/15/2005 Initial vendor notification 12/15/2005 Initial vendor response 03/02/2006 Public disclosure IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp Free tools, research and upcoming events http://labs.idefense.com X. LEGAL NOTICES Copyright © 2006 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@private for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. 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 arising from use of, or reliance on, this information.
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