Cisco Identity Services Engine contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the firewall implementation of Cisco Identity Services Engine could allow an unauthenticated, remote attacker to cause high CPU utilization and possibly the crash of some internal processes.
The vulnerability is due to insufficient implementation of the firewall rule to protect some open ports. An attacker could exploit this vulnerability by flooding the affected system with malformed IP packets.
Cisco has confirmed this vulnerability in a security notice and software updates are available.
At the time this alert was first published, Cisco Identity Services Engine Software versions 1.1 and prior were vulnerable. Later versions of Cisco Identity Services Engine Software may also be affected.
To exploit the vulnerability the attacker may need access to trusted internal networks to be able to send large amounts of malformed IP packets to the targeted system. This access requirement may limit the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2013-3445
Customers should refer to Cisco bug ID CSCug94572 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to utilize excessive amounts of CPU resources which could cause some internal processes to crash, resulting in a denial of service (DoS) condition.
The vulnerability is due to insufficient implementation of the firewall rule to protect some open ports on an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by sending a series of malformed IP packets to the targeted device. Successful exploitation could cause the targeted device to utilize excessive amounts of CPU resources which could crash some internal processes, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at email@example.com for assistance.
The security vulnerability applies to the following combinations of products.
Cisco Identity Services Engine Software
1.0 Base, .4.573 | 1.0 MR Base | 1.1 Base
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