CVE-2018-0123 Path traversal in Cisco IOS and IOS XE

Medium 5.5 Published 8 Feb 2018 Updated 2 Dec 2024

Authenticated local attackers can overwrite restricted system files via crafted input in the diagnostic shell of Cisco IOS and IOS XE devices.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-0123?

CVE-2018-0123 is a medium-severity path traversal vulnerability in Cisco Ios, published on 8 Feb 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A Path Traversal vulnerability in the diagnostic shell for Cisco IOS and IOS XE Software could allow an authenticated, local attacker to use certain diagnostic shell commands that can overwrite system files. These system files may be sensitive and should not be able to be overwritten by a user of the diagnostic shell. The vulnerability is due to lack of proper input validation for certain diagnostic shell commands. An attacker could exploit this vulnerability by authenticating to the device, entering the diagnostic shell, and providing crafted user input to commands at the local diagnostic shell CLI. Successful exploitation could allow the attacker to overwrite system files that should be restricted. Cisco Bug IDs: CSCvg41950.

Weakness: CWE-22

Which versions are affected by CVE-2018-0123?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2018-0123?

No fix has been published for CVE-2018-0123 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2018-0123 being exploited?

There is no known exploitation of CVE-2018-0123 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-3w7p-gc55-64xr.