Any further revisions to this information, if required, will be posted to the official advisory located at : http://www.symantec.com/avcenter/security/Content/2006.08.11.html Symantec Security Advisory SYM06-014 BID 19479 11 August 2006 Symantec Backup Exec for Windows Server: RPC Interface Heap Overflow, Authorized User Potential Elevation of Privilege Revision History None Severity Medium Remote Access Yes Local Access No Authentication Required Yes Exploit publicly available No Overview 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. Supported Product(s Affected Product Version Build Solution(s) Backup Exec for Windows Server and Remote Agent 9.1 9.1.4691 HotFix Available Backup Exec for Windows Server and Remote Agent 10.0 10.0.5484 HotFix Available Backup Exec for Windows Server and Remote Agent 10.0 10.0.5520 HotFix Available Backup Exec for Windows Server and Remote Agent 10.1 10.1.5629 HotFix Available Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 10.1.325.6301 HotFix Available Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 10.1.326.1401 HotFix Available Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 10.1.326.2501 HotFix Available Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 10.1.326.3301 HotFix Available Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 10.1.327.401 HotFix Available Backup Exec for Netware Server Remote Agent for Windows Server 9.1 All HotFix Available Backup Exec for Netware Server Remote Agent for Windows Server 9.2 All HotFix Available NOTE: ONLY the products and versions listed above are affected by these issues. Product versions prior to those listed above are NOT supported. Customers running legacy product versions should upgrade and apply available updates. Details Tenable Network Security, http://www.tenablesecurity.com/, 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 for Symantec Backup Exec for Windows Server and Continuous Protection Server and 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 CVE A CVE Candidate name has been requested from the Common Vulnerabilities and Exposures (CVE) initiative for this issue. This advisory will be revised accordingly upon receipt of the CVE Candidate name. This issue is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Credit: Symantec thanks Nicolas Pouvesle from Tenable Network Security for reporting this finding and for excellent coordination while Symantec resolved the issue.