Cisco NX-OS-Based devices contain a privilege escalation vulnerability when multiple virtual device contexts (VDCs) exist on the system and local authentication has been configured. A remote, authenticated attacker who can access the SSH management interfaces of an affected device could manipulate the login information supplied as part of the SSH key file to exploit the vulnerability. This could allow the attacker to obtain the privileges of an administrator in another VDC. Under certain conditions, this may allow the attacker to take complete control of the affected device.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Cisco NX-OS Software for Nexus 7000 Series devices versions 6.1(4a) and prior are affected.
The vulnerability is due to insufficient security restrictions on an affected device when it is configured with multiple VDCs and local authentication.
An authenticated, remote attacker who can access the management interfaces of a targeted device using SSH could exploit this vulnerability to manipulate the login information supplied as part of the SSH key file. A successful exploit could allow the attacker to gain elevated privileges in another VDC on the targeted device, which could result in a complete system compromise.
To exploit this vulnerability, an attacker must authenticate to a targeted device. This access requirement may reduce the likelihood of a successful exploit. In addition, the device must allow SSH access to the management interfaces for an attacker to exploit the vulnerability.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to grant SSH access to management interfaces on affected devices only to privileged users.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at email@example.com.
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