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Symantec Ghost Multiple Denial of Service Vulnerabilities

06.05.07

BACKGROUND

Symantec Ghost Solution Suite is an enterprise disk imaging software that allows administrators to remotely back-up and restore client computers from a central server. More information is available from the vendors site at the following URL.

http://www.symantec.com/enterprise/products/overview.jsp?pcid=1025&pvid=865_1

DESCRIPTION

Remote exploitation of multiple denial of service vulnerabilities in Symantec Corp.'s Ghost could allow remote attackers to crash the Ghost service.

These vulnerabilities affect both the client and server daemons due to what looks like a shared communications library. The daemons listen on UDP ports 1346, and 1347 respectively.

By sending a malformed UDP-based request to either service, an attacker can cause the service to crash due to an invalid memory reference. This condition can be caused by any of several unique requests. In each case, the particular cause for the access violation varies.

ANALYSIS

Exploitation allows remote attackers to crash the Ghost client or server applications.

The UDP packets can be multicast to an entire sub-net taking down all processes with one packet. Authentication is not required. Since it is a UDP packet, it is trivial for the attacker to mask the origin of the attack by forging the source IP address in the packet header.

By default, the Ghost services are not set to auto restart in the event of failure. Regardless, exploitation would likely abort any Ghost procedures currently in progress when the crash occurred.

DETECTION

iDefense confirmed the existence of these vulnerabilities using Symantec Ghost version 8.0.992 (as supplied with Ghost Solution Suite). Other versions may be vulnerable as well.

WORKAROUND

Employing firewalls to limit access to the client and server daemons can help prevent exploitation of these vulnerabilities. However, attackers could potentially bypass firewall rules by forging the origin of attack.

VENDOR RESPONSE

Symantec has addressed this vulnerability with a software update. For more information consult their advisory at the following URL.

http://www.symantec.com/avcenter/security/Content/2007.06.05b.html

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

12/13/2006 Initial vendor notification
12/13/2006 Initial vendor response
06/05/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Pravus.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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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.