CVE-2019-18988
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.
ACTIVELY EXPLOITED IN THE WILD
This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
TeamViewer Desktop Bypass Remote Login Vulnerability
TeamViewer Desktop
Apply updates per vendor instructions.
11/3/2021
https://nvd.nist.gov/vuln/detail/CVE-2019-18988
Vulnerability Summary
CVSS v3 Score
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2 Score
AV:L/AC:M/Au:N/C:P/I:P/A:P
EPSS Score (Exploitation Probability)
This vulnerability has a 7.63% probability of being exploited in the next 30 days, ranking higher than 92% of all scored CVEs.
CWE Classification
Related Vulnerabilities
Same Weakness Type(CWE-521)
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