Public Vulnerability Reports

Symantec Backup Exec RPC Remote Heap Overflow Vulnerability

07.11.07

BACKGROUND

Symantec Backup Exec is a data recovery solution. It provides backup services and includes agents that provide protection and recovery. Additionally, it facilitates management of local and remote server backups. More information is available at the URL shown below.

http://www.symantec.com/smb/products/overview.jsp?pcid=bu_rec&pvid=bewin_svr

DESCRIPTION

Remote exploitation of a heap overflow vulnerability in Symantec Backup Exec could allow an unauthenticated attacker to create a denial of service condition or potentially execute arbitrary code.

The flaw specifically exists within the RPC server that listens on TCP port 6106. When handling requests using the "ncacn_ip_tcp" protocol, the service will copy a user supplied amount of data into a fixed-size heap buffer.

ANALYSIS

Exploitation allows attackers to cause the affected service to terminate. This vulnerability has the potential to lead to the execution of arbitrary code.

No authentication is required to access the affected RPC service. An attacker only needs the ability to establish a TCP session.

DETECTION

iDefense confirmed the existence of this vulnerability in Symantec Backup Exec 10d with all current hot-fixes and service packs applied. Other versions are suspected to be vulnerable.

WORKAROUND

Employing firewalls to limit access to the affected service will mitigate exposure to this vulnerability.

VENDOR RESPONSE

Symantec has addressed this vulnerability by releasing a HotFix. More information is available in Symantec's advisory at the following URL.

http://securityresponse.symantec.com/avcenter/security/Content/2007.07.11a.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-3509 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

05/01/2007 Initial vendor notification
05/01/2007 Initial vendor response
07/11/2007 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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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.