A vulnerability in TACACS+ processing of Cisco IOS XR could allow an unauthenticated, remote attacker to cause a reload of the TACACS+ daemon (tacacsd) on the affected device. The vulnerability is due to improper parsing of a malformed TACACS+ packet. An attacker could exploit this vulnerability by sending a malformed TACACS+ packet to be processed by an affected device. An exploit could allow the attacker to cause a reload of the TACACS+ process on the device. Cisco has confirmed the vulnerability in a security notice and released software updates. To exploit this vulnerability, an attacker may need access to trusted, internal networks behind a firewall to send malformed TACACS+ packets to the targeted device. This access requirement may reduce the likelihood of a successful exploit. In addition, the attacker may need to obtain additional information, such as whether the device has TACACS+ configured, which is a condition that must be met to exploit this vulnerability. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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 | 2014-Sep-19 |
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