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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'...

Basic Information

CVE State
PUBLISHED
Reserved Date
November 15, 2019
Published Date
February 07, 2020
Last Updated
July 30, 2025
Vendor
TeamViewer
Product
TeamViewer Desktop
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.
Tags
cisa

CVSS Scores

CVSS v3.1

7.0 - HIGH

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

4.4

Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P

SSVC Information

Exploitation
active
Technical Impact
partial

Exploit Status

Exploited in the Wild
Yes (2021-11-03 00:00:00 UTC) Source
Proof of Concept Available
Yes (added 2020-07-01 09:56:29 UTC) Source

References

https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Security https://whynotsecurity.com/blog/teamviewer/ https://twitter.com/Blurbdust/status/1224212682594770946?s=20 https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264

Known Exploited Vulnerability Information

Source Added Date
CISA 2021-11-03 00:00:00 UTC

Potential Proof of Concepts

Warning: These PoCs have not been tested and could contain malware. Use at your own risk.

mr-r3b00t/CVE-2019-18988

Type: github • Created: 2020-07-13 15:30:02 UTC • Stars: 3

TeamViewer Store Credentials Decryption

reversebrain/CVE-2019-18988

Type: github • Created: 2020-07-01 09:56:29 UTC • Stars: 1

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Proof of Concept Exploit Available

  • Added to KEVIntel