|Security Advisory ID SYMSA1148|
Initial Publication Date:
28 Feb 2008
Vulnerabilities were reported in an ActiveX control that Symantec’s 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 user’s 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.
SeverityMedium (highly configuration dependent)
|Authentication Required||Authenticated user involvement required|
|Exploit publicly available||Yes|
|Symantec Backup Exec for Windows Server||11d||11.0.6235||Hotfix Available|
|Symantec Backup Exec for Windows Server||11d||11.0.7170||Hotfix Available|
|Symantec Backup Exec for Windows Server||12.0||12.0.1364||Hotfix Available|
|Symantec NetBackup on Windows Platforms||5.1||Prior to MP7||5.1 MP7|
|Symantec NetBackup on Windows Platforms||6.0||Prior to MP7||6.0 MP7|
|Symantec NetBackup on Windows Platforms||6.5||Prior to 6.5.2||6.5.2|
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.
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 ResponseSymantec 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 PracticesAs 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.
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