CVE-2020-3404 Cisco IOS XE Software Consent Token Bypass Vulnerability

Medium 6.7 Published 24 Sep 2020 Updated 13 Nov 2024

Authenticated local attackers can bypass consent token checks to gain root shell access on Cisco IOS XE 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-2020-3404?

CVE-2020-3404 is a medium-severity authentication bypass vulnerability in Cisco Ios Xe, 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 persistent Telnet/Secure Shell (SSH) CLI of Cisco IOS XE Software could allow an authenticated, local attacker to gain shell access on an affected device and execute commands on the underlying operating system (OS) with root privileges. The vulnerability is due to insufficient enforcement of the consent token in authorizing shell access. An attacker could exploit this vulnerability by authenticating to the persistent Telnet/SSH CLI on an affected device and requesting shell access. A successful exploit could allow the attacker to gain shell access on the affected device and execute commands on the underlying OS with root privileges.

Weakness: CWE-863

Which versions are affected by CVE-2020-3404?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3404?

No fix has been published for CVE-2020-3404 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-2020-3404 being exploited?

There is no known exploitation of CVE-2020-3404 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-rh2h-wrf9-gh69.