CVE-2018-0484 Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability

Medium 5.3 Published 10 Jan 2019 Updated 19 Nov 2024

Attackers can bypass SSH access controls to connect from VRF instances, though valid credentials are still required for full access.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-0484?

CVE-2018-0484 is a medium-severity authentication bypass vulnerability in Cisco Ios, published on 10 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-284

Which versions are affected by CVE-2018-0484?

It affects 1 product.

Products include Cisco Ios.

How do I fix CVE-2018-0484?

No fix has been published for CVE-2018-0484 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2018-0484 being exploited?

There is no known exploitation of CVE-2018-0484 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-wpcx-9mmv-mm42.