CVE-2021-42073 Auth bypass in n/a
Attackers can bypass authentication in Barrier by guessing client labels, allowing them to capture input events and modify clipboard content on the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-42073?
CVE-2021-42073 is a high-severity authentication bypass vulnerability in n/a, published on 8 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component (aka the server-side implementation of Barrier) simply by supplying a client label that identifies a valid client configuration. This label is "Unnamed" by default but could instead be guessed from hostnames or other publicly available information. In the active session state, an attacker can capture input device events from the server, and also modify the clipboard content on the server.
Weakness: CWE-384
Which versions are affected by CVE-2021-42073?
It affects 1 product.
Products include Barrier Project Barrier.
How do I fix CVE-2021-42073?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-42073 being exploited?
There is no known exploitation of CVE-2021-42073 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-fm32-wgpg-7rc9.