Multiple Cisco VPN devices contain a vulnerability that could allow an unauthenticated, remote attacker to gain access to sensitive information. The vulnerability exists due to unsafe handling of error response codes. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious requests to the targeted device. If successful, the attacker could determine the existence of VPN group names in use on the device. Cisco has confirmed the vulnerability in a security response and released software updates. Because the affected devices typically accept unsolicited connections from untrusted networks, an attacker could easily target a vulnerable system. If an exploit is successful, the attacker could gain access to sensitive information about the device that could aid the attacker in further exploits. Administrators should note that Cisco PIX 500 Series devices and Cisco VPN 300 Series Concentrators have reached end of life. As a result, no software updates will be issued for these products.
Multiple Cisco VPN devices contain a vulnerability that could allow an unauthenticated, remote attacker to gain access to sensitive information.
The vulnerability exists due to unsafe handling of error response codes. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious requests to the targeted device. If successful, the attacker could determine the existence of VPN group names in use on the device.
Cisco has confirmed the vulnerability in a security response and released software updates.
Because the affected devices typically accept unsolicited connections from untrusted networks, an attacker could easily target a vulnerable system. If an exploit is successful, the attacker could gain access to sensitive information about the device that could aid the attacker in further exploits.
Administrators should note that Cisco PIX 500 Series devices and Cisco VPN 300 Series Concentrators have reached end of life. As a result, no software updates will be issued for these products.
Cisco has re-released a security response to address Cisco bug ID CSCtj96108 at the following link: cisco-sr-20101124-vpn-gprname
The following Cisco devices are affected:
Administrators are advised to apply the available updates.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators may consider configuring devices to use certificate-based VPNs.
Administrators are advised to monitor critical systems.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2010-Dec-03 |
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