[NT] Symantec Backup Exec for Windows Server: RPC Interface Heap Overflow, Authorized User Potential Elevation of Privilege

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Symantec Backup Exec for Windows Server: RPC Interface Heap Overflow,
Authorized User Potential Elevation of Privilege
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SUMMARY

The Backup Exec for Windows Server and Remote Agents for Window Server,
also used by the Continuous Protection Server and Backup Exec for Netware
Server, are vulnerable to heap overflows from specifically formatted
internal network calls to RPC interfaces.

DETAILS

Vulnerable Systems:
* Backup Exec for Windows Server and Remote Agent version 9.1 (9.1.4691)
* Backup Exec for Windows Server and Remote Agent version 10.0
(10.0.5484)
* Backup Exec for Windows Server and Remote Agent version 10.0
(10.0.5520)
* Backup Exec for Windows Server and Remote Agent version 10.1
(10.1.5629)
* Backup Exec Continuous Protection Server Remote Agent for Windows
Server version 10.1 (10.1.325.6301)
* Backup Exec Continuous Protection Server Remote Agent for Windows
Server version 10.1 (10.1.326.1401)
* Backup Exec Continuous Protection Server Remote Agent for Windows
Server version 10.1 (10.1.326.2501)
* Backup Exec Continuous Protection Server Remote Agent for Windows
Server version 10.1 (10.1.326.3301)
* Backup Exec Continuous Protection Server Remote Agent for Windows
Server version 10.1 (10.1.327.401)
* Backup Exec for Netware Server Remote Agent for Windows Server version
9.1 (All)
* Backup Exec for Netware Server Remote Agent for Windows Server version
9.2 (All)

Tenable Network Security, notified Symantec of heap overflow issues they
identified in the RPC interfaces of the Backup Exec for Window Servers and
Remote Agents. The Remote Agent for Windows Server (RAWS) is also used by
the Continuous Protection Server as well as Backup Exec for Netware Server
depending on the customer's network environment. The overflows occur due
to improper validation and subsequent handling of user input. Successful
exploitation would require the attacker to have authorized but
non-privileged access to the network on which the target system resides. A
malicious user who attempted such an attack may cause the targeted
application to crash but, if successfully exploited, could potentially
execute arbitrary code and gain elevated privilege on the targeted system.

Symantec Response:
Symantec engineers did an in-depth review of the reported issues and
related file functionality to further enhance the overall security of
Symantec Backup Exec for Windows Server and the Remote Agent for Windows
Server and to resolve any additional potential concerns. Symantec
engineers have addressed these issues in all currently supported versions
of the products identified above. Security updates are available for all
supported products.

Symantec strongly recommends all customers apply the latest security
update as indicated for their supported product versions to protect
against threats of this nature.

Symantec knows of no exploitation of or adverse customer impact from these
issues.

The patches listed above for affected products are available from the
following location:
<http://support.veritas.com/docs/284343>
http://support.veritas.com/docs/284343 for Symantec Backup Exec for
Windows Server and Continuous Protection Server and
<http://support.veritas.com/docs/284623>
http://support.veritas.com/docs/284623 for Backup Exec for Netware Server.

Best Practices:
As part of normal best practices, Symantec recommends:

* Restrict access to administration or management systems to authorized
privileged users
* Block remote access to all ports not essential for efficient operation
* Restrict remote access, if required, to trusted/authorized systems only
* Remove/disable unnecessary accounts or restrict access according to
security policy as required
* Run under the principle of least privilege where possible
* Keep all operating systems and applications updated with the latest
vendor patches
* Follow a multi-layered approach to security. Run both firewall and
antivirus applications, at a minimum, to provide multiple points of
detection and protection to both inbound and outbound threats
* Deploy network intrusion detection systems to monitor network traffic
for signs of anomalous or suspicious activity. This may aid in detection
of attacks or malicious activity related to exploitation of latest
vulnerabilities


ADDITIONAL INFORMATION

The information has been provided by Nicolas Pouvesle.
The original article can be found at:
<http://www.symantec.com/avcenter/security/Content/2006.08.11.html>
http://www.symantec.com/avcenter/security/Content/2006.08.11.html



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