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Cisco Flaws Leave Firewalls, VPNs Vulnerable

Cisco Flaws Leave Firewalls, VPNs Vulnerable
Cisco Flaws Leave Firewalls, VPNs Vulnerable,1895,2008557,00.asp 

By Ryan Naraine
August 25, 2006

Network routing and switching giant Cisco Systems has issued an alert 
for a potentially serious security flaw affecting multiple firewall 
products, warning that the bug could cause passwords to be changed 
without any user interaction.

The San Jose, Calif., company said unauthorized users can take advantage 
of the firewall bug to try to gain access to a device that has been 
reloaded after passwords in its startup configuration have been changed.

In addition, authorized users can be locked out and lose the ability to 
manage the affected device, according to the published advisory.

Affected products include Cisco PIX 500 Series Security Appliances, the 
Cisco ASA 5500 Series Adaptive Security Appliances and the FWSM 
(Firewall Services Module) for the Cisco Catalyst 6500 switches.

Cisco 7600 Series routers are impacted if they are running an affected 
software version, the company said.

"The software issue may cause the EXEC password, password of locally 
defined users, and the enable password in the startup configuration to 
change without user's intervention. This will prevent administrators 
from logging in to the device if authentication is configured to use the 
passwords stored in the startup configuration," Cisco warned.

The company also posted patches for a pair of vulnerabilities in the 
Cisco VPN 3000 series concentrators when file management via FTP (File 
Transfer Protocol) is enabled.

The Cisco VPN 3000 series concentrators are a family of remote access 
VPN (virtual private network) platforms for data encryption and 

In a separate alert, Cisco said the flaws could allow authenticated or 
unauthenticated attackers to execute certain FTP commands and delete 
files on the concentrator.

Vulnerable products are the Cisco VPN 3000 series concentrators 3005, 
3015, 3020, 3030, 3060 and 3080.

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