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28 February, 2008
Symantec Backup Exec and NetBackup for Windows Servers Multiple Vulnerabilities in Scheduler

Revision History
3/3/2008 - Exploit code for these issues is currently available publicly
9/24/2008 -Versions of NetBackup on supported Windows Platforms were found to ship a vulnerable control although used in a more restrictive environment. They have been added as affected products

Medium (highly configuration dependent)

Remote AccessYes
Local AccessNo
Authentication RequiredAuthenticated user involvement required
Exploit publicly availableYes

Vulnerabilities were reported in an ActiveX control that Symantecís Backup Exec for Windows Server (BEWS) installs with its scheduler. Exploitation of these issues could possibly lead to unauthorized information disclosure, system information corruption or potentially allow arbitrary code execution in the context of the userís browser. However, successful exploitation requires specific conditions.
The scheduler shipping with earlier versions of NetBackup (NBU) for Windows, while used in a very restrictive environment, was also found to contain this vulnerable control.

Products Affected
Symantec Backup Exec for Windows Server 11d11.0.6235 Hotfix Available
Symantec Backup Exec for Windows Server 11d11.0.7170 Hotfix Available
Symantec Backup Exec for Windows Server Hotfix Available
Symantec NetBackup on Windows Platforms5.1Prior to MP75.1 MP7
Symantec NetBackup on Windows Platforms6.0Prior to MP76.0 MP7
Symantec NetBackup on Windows Platforms6.5Prior to

Note:ONLY the products and versions listed as affected above are vulnerable to these issues. This issue impacts the Server only. Remote client agents are NOT affected.

Symantec was alerted to multiple vulnerabilities consisting of stack overflows and unsafe method calls that Secunia Research discovered in an ActiveX control, installed with Symantec BEWS and with NBU for Windows as a part of the scheduler component. Although this control is not intended to be called via an external web browser, it failed to properly parse or validate external input. If accessed by an authorized but non-privileged user, this improper validation could potentially result in a browser crash or it could possibly permit unauthorized methods calls allowing access to overwrite or corrupt files. Unauthorized access to the vulnerable control could also result in possible buffer overflows with the potential for malicious code execution in the context of the targeted browser.

The impact of this threat is considerably lessened as it would require authorized user involvement in any attempt to compromise the targeted server. To exploit successfully, an attacker would need to be aware of the exact path to the vulnerable control. An attacker would have to be able to effectively entice a user to upload and execute malicious scripts via HTML email or visit a malicious web site hosting malicious code that could be effectively run against this vulnerable control.

Symantec Response
Symantec product engineers have developed and released solutions for this issue through
Symantec's LiveUpdate capability and support channels as indicated.
Symantec recommends all customers apply all updates to protect against threats of this nature.
Symantec knows of no exploitation of or adverse customer impact from these issues.
The patches listed for affected products are available from the following location:


For NBU on Windows:

Symantec has developed IDS signatures to detect and block attempts to exploit these issues.

Best Practices
As part of normal best practices, Symantec strongly recommends a multi-layered approach to security

  • Run under the principle of least privilege where possible.
  • Keep all operating systems and applications updated with the latest vendor patches.
  • Users, at a minimum, should run both a personal firewall and antivirus application with current updates to provide multiple points of detection and protection to both inbound and outbound threats.
  • Users should be cautious of mysterious attachments and executables delivered via email and be cautious of browsing unknown/untrusted websites or opening unknown/untrusted URL links.
  • Do not open unidentified attachments or executables from unknown sources or that you didn't request or were unaware of.
  • Always err on the side of caution. Even if the sender is known, the source address may be spoofed.
  • If in doubt, contact the sender to confirm they sent it and why before opening the attachment. If still in doubt, delete the attachment without opening it.

Symantec would like to thank JJ Reyes with Secunia Research for reporting these findings and coordinating closely with Symantec as we resolved the issues.

The Common Vulnerabilities and Exposures (CVE) initiative has assigned:
CVE-2007-6016 to the buffer overflow issue
CVE-2007-6017 to the unsafe methods issue
These issues are candidates for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security issues.
SecurityFocus has assigned Bugtraq ID BID 26904 for the buffer overflows and BID 28008 for the unsafe methods for inclusion in the Security Focus vulnerability database.

Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows the principles of responsible disclosure. Symantec also subscribes to the vulnerability disclosure guidelines outlined by the National Infrastructure Advisory Council (NIAC).

Please contact secure@symantec.com if you feel you have discovered a security issue in a Symantec product. A Symantec Product Security team member will contact you regarding your submission. Symantec strongly recommends using encrypted email for reporting vulnerability information to secure@symantec.com. The Symantec Product Security PGP key can be found at the end of this message.

Symantec has developed a Product Vulnerability Response document outlining the process we follow in addressing suspected vulnerabilities in our products. This document is available below.

PDF Symantec Vulnerability Response Policy PGP Symantec Product Vulnerability Management PGP Key

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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.

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Last modified on: Wednesday, 24-Sep-08 09:08:43
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