Rule: -- Sid: 2563 -- Summary: This event is generated when an attempt is made to exploit a vulnerability associated with the Symantec Firewall. -- Impact: A successful attack may cause a heap overflow, permitting the execution of arbitrary code on the vulnerable host. -- Detailed Information: There is a vulnerability in the way the Symantec Firewall handles NetBIOS Name Service response packets. If an attacker crafts a malicious UDP NetBIOS Name Service unsolicited response to a vulnerable Symantec Firewall that does not block port 137, it is possible to cause a heap overflow and execute abitrary code with kernel privileges. The vulnerability exists because of improper validation of the existence of required fields for the NetBIOS name returned. The default configuration does not allow UDP port 137 traffic and should not be exploitable if UDP port 137 is blocked. -- Affected Systems: Symantec Norton Internet Security and Professional 2002,2003,2004 Symantec Norton Personal Firewall 2002,2003,2004 Symantec Norton AntiSpam 2004 Symantec Client Firewall 5.01, 5.1.1 Symantec Client Security 1.0, 1.1, 2.0(SCF 7.1) -- Attack Scenarios: An attacker can craft a malicious UDP NetBIOS Name Service response, possibly causing a heap overflow and the subsequent execution of arbitrary code with kernel privileges on an exploitable host. -- Ease of Attack: Simple. -- False Positives: None known. -- False Negatives: None known. -- Corrective Action: Upgrade to the latest non-affected version of the software. -- Contributors: Sourcefire Research Team Judy Novak <judy.novak@sourcefire.com> -- Additional References CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0444 Bugtraq: http://www.securityfocus.com/bid/10335 Misc: http://www.eeye.com/html/Research/Advisories/AD20040512C.html --