[UNIX] EMC Dantz Retrospect Backup DoS

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EMC Dantz Retrospect Backup DoS
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SUMMARY

<http://www.dantz.com> 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.

The vulnerability allows for an unauthenticated attacker to effectively
disable the network backup services for a target network.

DETAILS

Vulnerable Systems:
* Dantz Retrospect Client version 7.0.107

Immune Systems:
* The version available for Mac is 6.0 is not vulnerable.

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.

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.

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/>
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>
http://kb.dantz.com/article.asp?article=8361&p=2

Disclosure Timeline:
* 12.15.05 - Initial vendor notification.
* 12.15.05 - Initial vendor response.
* 03.02.06 - Public disclosure.


ADDITIONAL INFORMATION

The information has been provided by iDefense.
The original article can be found at:
<http://www.idefense.com/intelligence/vulnerabilities/display.php?id=398>
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=398



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