Vulnerability: Unauthorized SSH Access to Cisco IOS and IOS XE Devices via VRF Instance

CVE-2018-0484 · MEDIUM Severity

AV:N/AC:L/AU:S/C:N/I:P/A:N

A vulnerability in the access control logic of the Secure Shell (SSH) server of Cisco IOS and IOS XE Software may allow connections sourced from a virtual routing and forwarding (VRF) instance despite the absence of the vrf-also keyword in the access-class configuration. The vulnerability is due to a missing check in the SSH server. An attacker could use this vulnerability to open an SSH connection to an affected Cisco IOS or IOS XE device with a source address belonging to a VRF instance. Once connected, the attacker would still need to provide valid credentials to access the device.

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