Symantec Security Advisory SYM08-007: Multiple vulnerabilities in the Backup Exec 11d and 12.0 for Windows Servers scheduler

Article:TECH57968  |  Created: 2010-01-09  |  Updated: 2011-10-10  |  Article URL http://www.symantec.com/docs/TECH57968
Article Type
Technical Solution

Product(s)

Issue



Symantec Security Advisory SYM08-007: Multiple vulnerabilities in the Backup Exec 11d and 12.0 for Windows Servers scheduler


Solution



Symantec Security Advisory SYM08-007

28 February, 2008

Symantec's Backup Exec for Windows Server:  Multiple Vulnerabilities in Scheduler

Revision History
Exploitation code has been found to be publicly available for this issue.


Severity
Medium

 
Exploit publicly available Yes
Remote Access Yes
Local Access No
Authentication Required Authenticated user involvement required


Overview
Vulnerabilities were reported in an ActiveX control that Symantec's Backup Exec for Windows Servers (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 user's browser. However, successful exploitation requires specific conditions.

Because exploitation code has been found to be publicly available for this issue, it is recommended that all BEWS systems are patched with the hotfix mentioned in this article as soon as possible.

Affected Products

 
Product Version Build Solution
Symantec Backup Exec for Windows 11d 11.0.6235 Hotfix Available
Symantec Backup Exec for Windows 11d 11.0.7170 Hotfix Available
Symantec Backup Exec for Windows 12 12.0.1364 Hotfix Available


NOTE: ONLY the products and versions listed as affected above are vulnerable to these issues. This issue impacts the Backup Exec media server only. Remote client agents are NOT affected.

How to obtain the patch:
 
For 32bit Media Servers:
 
Backup Exec 11.0.6235:  www.symantec.com/docs/TECH59745
 
Backup Exec 11.0.7170:  http://library.veritas.com/docs/317520
 
Backup Exec 12.0.1364:  www.symantec.com/docs/TECH58088
 

 
For 64bit Media Servers:
 
Backup Exec 11.0.6235: www.symantec.com/docs/TECH59745
 
Backup Exec 11.0.7170: http://library.veritas.com/docs/317521  
 
Backup Exec 12.0.1364:  www.symantec.com/docs/TECH58089
 


To which versions of Backup Exec can this hotfix be applied?

This hotfix can only be applied to the following versions of Backup Exec:
Backup Exec 11d for Windows Servers revision 6235 with Service Pack 2
Backup Exec 11d for Windows Servers revision 7170 with Service Pack 2
Backup Exec 12.0 for Windows Servers revision 1364

 
Details
 
Symantec was alerted to multiple vulnerabilities consisting of stack overflows and unsafe method calls that Secunia Research discovered in an ActiveX control, installed with BEWS as a part of the scheduler component. Although this control was not intended to be called via an external web browser, it failed to properly parse or validate external input.  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 user's browser.
 
The impact of this threat is considerably lessened as it would require authorized user involvement in any attempt to compromise the targeted system.  To exploit successfully, an attacker would need to be aware of the exact path to the vulnerable control and 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.
 

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 above for affected products are also available from the following location:

Backup Exec 11.0.6235:    www.symantec.com/docs/TECH59745
Backup Exec 11.0.7170:  www.symantec.com/docs/TECH66712   
Backup Exec 12.0.1364:  www.symantec.com/docs/TECH57862

Mitigation
Symantec has developed IDS signatures to detect and block attempts to exploit this issue.

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.
 

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

 

 
References
 
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 (  http://www.securityfocus.com/ ) has assigned Bugtraq ID BID 26904 for the buffer overflows and BID 28008 for the unsafe methods for inclusion in the SecurityFocus vulnerability database.

 

 




Legacy ID



300471


Article URL http://www.symantec.com/docs/TECH57968


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