CVE-2019-18988 TeamViewer Desktop Bypass Remote Login
Attackers can decrypt protected configuration data using a shared AES key, potentially enabling remote login and file access.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-18988?
CVE-2019-18988 is a high-severity vulnerability in n/a, published on 7 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers' installations. It used a shared AES key for all installations since at least as far back as v7.0.43148, and used it for at least OptionsPasswordAES in the current version of the product. If an attacker were to know this key, they could decrypt protect information stored in the registry or configuration files of TeamViewer. With versions before v9.x , this allowed for attackers to decrypt the Unattended Access password to the system (which allows for remote login to the system as well as headless file browsing). The latest version still uses the same key for OptionPasswordAES but appears to have changed how the Unattended Access password is stored. While in most cases an attacker requires an existing session on a system, if the registry/configuration keys were stored off of the machine (such as in a file share or online), an attacker could then decrypt the required password to login to the system.
Weakness: CWE-521
Which versions are affected by CVE-2019-18988?
It affects 1 product.
Products include Teamviewer Teamviewer.
How do I fix CVE-2019-18988?
No fix has been published for CVE-2019-18988 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.
Is CVE-2019-18988 being exploited?
Yes. Attackers have exploited CVE-2019-18988 in the wild since at least 3 Nov 2021.
Public exploit code: 1 Metasploit module and 1 proofs of concept on GitHub.
Other vulnerabilities in n/a
Sources
Also known as GHSA-98mp-frx2-qv94.