CVE-2021-34723 Cisco IOS XE SD-WAN Software Arbitrary File Overwrite Vulnerability

Medium 6.7 Published 23 Sep 2021 Updated 7 Nov 2024

An authenticated local attacker can overwrite configuration files to gain root access on Cisco IOS XE SD-WAN devices.

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-2021-34723?

CVE-2021-34723 is a medium-severity path traversal vulnerability in Cisco Ios Xe, published on 23 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in a specific CLI command that is run on Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the configuration database of an affected device. This vulnerability is due to insufficient validation of specific CLI command parameters. 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 the configuration database and gain root-level access to an affected device.

Weakness: CWE-668

Which versions are affected by CVE-2021-34723?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-34723?

No fix has been published for CVE-2021-34723 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-2021-34723 being exploited?

There is no known exploitation of CVE-2021-34723 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-66cj-3q7r-633r.