|Security Advisory ID SYMSA1166|
Initial Publication Date:
19 Nov 2008
Vulnerabilities were found in the authentication methods for logging onto a Backup Exec Remote Agent for Windows, Linux/Unix, Macintosh and Remote Media Agent for Linux Servers, that could allow an unprivileged user to gain unauthorized access to the application. Once authenticated, the user could further leverage a potential buffer overflow in the data management protocol in an attempt to crash or possibly further compromise the targeted system.
|Remote Access (adjacent network)||Yes|
Note: ONLY the product versions and builds listed below as affected are vulnerable to these issues. This impacts the remote agents present on both Media servers and Remote backup hosts.
|Symantec Backup Exec for Windows Server||12.5||2213||Hotfix Available|
|Symantec Backup Exec for Windows Server||12||1364||Hotfix Available|
|Symantec Backup Exec for Windows Server||11d||7170||Hotfix Available|
|Symantec Backup Exec for Windows Server||11d||6235||Hotfix Available|
Tenable Network Security worked with Symantec to identify multiple vulnerability issues in authentication as well as a buffer overflow potential once authenticated on affected Symantec Backup Exec remote agents. An unprivileged but authorized network user could potentially bypass the authentication during the logon process with the Backup Exec remote agents. Access could allow the unauthorized user to retrieve or delete files from the targeted host. Once authenticated, a potential buffer overflow is present in the data management protocol that could allow the unauthorized user to crash or possibly further compromise the targeted system.
|Remote Access (adjacent network)||Yes|
Security Focus, http://www.securityfocus.com, has assigned a Bugtraq ID (BID) to these issues for inclusion in the Security Focus vulnerability database. BID 32347 has been assigned to the authentication bypass issue and BID 32346 has been assigned to the buffer overflow in the data management protocol.
A CVE Candidate name will be requested from the Common Vulnerabilities and Exposures (CVE) initiative for these issues. This advisory will be revised accordingly upon receipt of the CVE Candidate names. These issues are candidates for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
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.
Technical documentation concerning this issue is available from:
MitigationSymantec has released an IPS signature to detect and block attempts to exploit the buffer overflow (BID 32346).
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.
- 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 Renaud Deraison and Nicolas Pouvesle with Tenable Network Security for coordinating on these findings and working closely with Symantec as the issues were resolved.