Buffer overflow in a certain driver in Cisco Security Agent 4.5.1 before 4.5.1.672, 5.0 before 5.0.0.225, 5.1 before 5.1.0.106, and 5.2 before 5.2.0.238 on Windows allows remote attackers to execute arbitrary code via a crafted SMB packet in a TCP session on port (1) 139 or (2) 445.

Buffer overflow in a certain driver in Cisco Security Agent 4.5.1 before 4.5.1.672, 5.0 before 5.0.0.225, 5.1 before 5.1.0.106, and 5.2 before 5.2.0.238 on Windows allows remote attackers to execute arbitrary code via a crafted SMB packet in a TCP session on port (1) 139 or (2) 445.

Buffer overflow in a certain driver in Cisco Security Agent 4.5.1 before 4.5.1.672, 5.0 before 5.0.0.225, 5.1 before 5.1.0.106, and 5.2 before 5.2.0.238 on Windows allows remote attackers to execute arbitrary code via a crafted SMB packet in a TCP session on port (1) 139 or (2) 445. Cisco Security Agent for Microsoft Windows is prone to a buffer-overflow vulnerability because it fails to properly bounds-check user-supplied data. Remote attackers can exploit this issue to execute arbitrary machine code with SYSTEM-level privileges. Successful exploits will completely compromise affected computers. Failed attacks will likely cause denial-of-service conditions. This issue affects all standalone and managed versions of Cisco Security Agent for Windows. A remote attacker might cause system with CSA installed to restart or BSOD. By sending carefully crafted data an attacker might cause remote code execution, thus gains complete control over the system.

By default CSA allows access to TCP ports 139 and 445. After establishing a session to TCP ports 139 and 445, an attacker can complete an exploitation without any authentication simply by sending a single packet. Other Cisco software that uses CSA component is also affected.

Workaround =============

* Restrict access to TCP ports 139 and 445. Vendor Status ==============

2007.09.27 Informed the vendor 2007.10.23 Vendor confirmed the vulnerability 2007.12.05 Vendor released a security advisory (cisco-sa-2007120…