Cisco Secure Access Control System contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the TACACS+ socket read function of Cisco Secure ACS versions 5.x could allow an unauthenticated, remote attacker to cause a runtime process to crash.
The vulnerability is due to improper processing of read requests on the TACACS+ socket. An attacker could exploit this vulnerability by sending malformed TCP packets to an affected ACS server configured for TACACS+. An exploit could allow the attacker to cause a runtime process to crash, resulting in a denial of service (DoS) condition for TACACS+ requests.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco Secure ACS versions 126.96.36.199.3 and prior were vulnerable. Later releases of Cisco Secure ACS may also be vulnerable.
To exploit this vulnerability, the attacker would need to send malformed TCP packets to the targeted system. To achieve this objective, the attacker may need access to trusted, internal network resources. This access requirement reduces 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-2013-5470
Customers are advised to consult Cisco bug ID CSCuh12488 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause a runtime process to crash, resulting in a DoS condition.
The vulnerability is due to improper processing of read requests on the TACACS+ socket used by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending malformed TCP packets to an affected ACS configured for TACACS+. If successful, the attacker could cause a runtime process on an affected system to crash, 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 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.
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