Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:P/A:P/E:F/RL:OF/RC:C
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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.
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.
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Customers are advised to consult Cisco bug ID CSCuh12488 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Secure ACS versions 5.4.0.46.3 and prior were vulnerable. Later releases of Cisco Secure ACS may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.
Administrators are advised to monitor affected systems.
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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 tac@cisco.com for assistance.
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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.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2013-Sep-04
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