Cisco NX-OS Software contains a vulnerability that could allow a local attacker to execute certain commands without TACACS+ server authorization. Updates are not available.
A vulnerability in the TACACS+ command authorization code of Cisco NX-OS Software could allow an authenticated, local attacker to execute certain commands without TACACS+ server authorization.
The vulnerability is due to the processing of certain commands when executed in a sequence. An attacker could exploit this vulnerability by executing multiple commands in a sequence. A successful exploit could allow the attacker to execute certain commands without TACACS+ server authorization.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
At the time this alert was first published, Cisco NX-OS Software Release 6.2(2a) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.
To exploit this vulnerability, an attacker must have local access to an affected device. This access requirement reduces the possibility of a successful exploit.
Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2014-0676
Customers are advised to consult Cisco bug ID CSCum47367 for the most complete list of affected product versions.
A local attacker could exploit this vulnerability to execute certain commands on an affected device without TACACS+ server authorization. A successful exploit could result in a complete system compromise.
The vulnerability is due to the affected software processing and executing certain commands in a sequence.
A local attacker could exploit this vulnerability by executing multiple commands in a sequence on a targeted device. A successful exploit could allow the attacker to execute certain commands without TACACS+ server authorization, which could result in a complete system compromise.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators may consider removing access to all show commands or removing access to config mode with roles on affected devices.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor affected systems.
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