#VU16928 Security restrictions bypass in Cisco IOS - CVE-2018-0484
Published: January 9, 2019 / Updated: January 10, 2019
Vulnerability identifier: #VU16928
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-0484
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco IOS
Cisco IOS
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The vulnerability exists in the access control logic of the Secure Shell (SSH) server due to a missing check in the SSH server. A remote unauthenticated attacker can open an SSH connection to an affected Cisco IOS or IOS XE device with a source address belonging to a VRF instance and forward the instance despite the absence of the vrf-also keyword in the access-class configuration.
Remediation
The vulnerability has been fixed in the versions 16.6.5, 16.6(4.12), 15.8(3.1s)M, 15.8(3)M1.