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AUSCERT External Security Bulletin Redistribution
ESB-2006.0160 -- [Win]
EMC Dantz Retrospect 7 Backup client DoS Vulnerability
6 March 2006
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AusCERT Security Bulletin Summary
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Product: Retrospect Client for Windows
Publisher: iDEFENSE
Operating System: Windows
Impact: Denial of Service
Access: Remote/Unauthenticated
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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@idefense.com 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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