Public Vulnerability Reports

Symantec Backup Exec RPC Remote Heap Overflow Vulnerability



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.


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.


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.


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.


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


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


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 (, which standardizes names for security problems.


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


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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