OMEN
12-07-2007, 08:06 PM
Cisco Systems Inc. is advising Windows users of its Cisco Security Agent software to upgrade the product because of a security bug.
The flaw lies in a driver used by the client software. By sending maliciously crafted data to the PC, attackers could create a buffer overflow condition in the Windows kernel, causing the system to crash.
Security firm Secunia rated the crash flaw "moderately critical," but the vulnerability could also be used by attackers to run unauthorized software on the Windows machine, Cisco warned.
Cisco released hot fixes for the bug Wednesday. A large number of Cisco products install this agent, including the Cisco Security Manager, Cisco Unified Communications Manager and the Cisco Voice Portal.
If attackers find a way to exploit this flaw to run code, it could become a serious security problem.
"Back in 2004, such a vulnerability would probably have led to a flurry of noisy network worms," wrote Daniel Wesemann, a handler at the SANS Internet Storm Center, in a blog posting. "Today, drive-by installs of spyware are more likely but at least as damaging. The bottom line is still the same: If you are using the vulnerable component, patch as soon as possible."
The buffer overflow can be caused by sending a malicious TCP packet to ports 139 or 445, the ports used by the Microsoft Server Message Block file-sharing protocol.
IDG
The flaw lies in a driver used by the client software. By sending maliciously crafted data to the PC, attackers could create a buffer overflow condition in the Windows kernel, causing the system to crash.
Security firm Secunia rated the crash flaw "moderately critical," but the vulnerability could also be used by attackers to run unauthorized software on the Windows machine, Cisco warned.
Cisco released hot fixes for the bug Wednesday. A large number of Cisco products install this agent, including the Cisco Security Manager, Cisco Unified Communications Manager and the Cisco Voice Portal.
If attackers find a way to exploit this flaw to run code, it could become a serious security problem.
"Back in 2004, such a vulnerability would probably have led to a flurry of noisy network worms," wrote Daniel Wesemann, a handler at the SANS Internet Storm Center, in a blog posting. "Today, drive-by installs of spyware are more likely but at least as damaging. The bottom line is still the same: If you are using the vulnerable component, patch as soon as possible."
The buffer overflow can be caused by sending a malicious TCP packet to ports 139 or 445, the ports used by the Microsoft Server Message Block file-sharing protocol.
IDG