CVE-2020-3476 Cisco IOS XE Software Arbitrary File Overwrite Vulnerability

Medium 4.4 Published 24 Sep 2020 Updated 13 Nov 2024

An authenticated local attacker can overwrite arbitrary files on the host file system via insufficient validation in a specific CLI command.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3476?

CVE-2020-3476 is a medium-severity path traversal vulnerability in Cisco Ios, published on 24 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the CLI implementation of a specific command of Cisco IOS XE Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying host file system. The vulnerability is due to insufficient validation of the parameters of a specific CLI command. An attacker could exploit this vulnerability by issuing that command with specific parameters. A successful exploit could allow the attacker to overwrite the content of any arbitrary file that resides on the underlying host file system.

Weakness: CWE-552

Which versions are affected by CVE-2020-3476?

It affects 1 product.

Products include Cisco Ios.

How do I fix CVE-2020-3476?

No fix has been published for CVE-2020-3476 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-2020-3476 being exploited?

There is no known exploitation of CVE-2020-3476 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-wmmw-33p5-2c6j.