NOTE: ONLY the products and versions listed as affected above are vulnerable to these issues. This issue impacts the server only. Client agents are NOT affected.
Details Secunia Research notified Symantec of three DoS issues involving erroneous packet handling affecting components of the Symantec Backup Exec for Windows Servers Job Engine. One is a null-pointer dereference issue that crashes the listening service, and two additional issues involving integer overflows that can force the service into an infinite loop resulting in memory exhaustion or high CPU utilization. Successful exploitation requires access to the affected port. In normal installations this would require the attacker to have authorized but non-privileged access to the network on which the targeted server resides to leverage network communications.
A successful attack could result in termination of the targeted service and loss of scheduling services or potentially loss of access to the application until the service is restarted or the targeted activity ceases.
The Common Vulnerabilities and Exposures (CVE) initiative has assigned:
CVE-2007-4346 to the null pointer dereference DoS issue
CVE-2007-4347 to the integer overflow DoS issues
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 26028 for the null pointer issue and BID 26029 for the integer overflow issues for inclusion in the SecurityFocus vulnerability
Symantec engineers have addressed this issue in all affected builds of the identified product. Security updates are available for all affected product builds.
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.
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
Symantec would like to thank JJ Reyes with Secunia Research for reporting these findings and coordinating closely with Symantec as we resolved the issues.
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