Hard-coded cryptographic key in TeamViewer

1) Use of Hard-coded Cryptographic Key

EUVDB-ID: #VU27102

Risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2019-18988

CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key

Exploit availability: No

Description

The vulnerability allows a local user to decrypt stored credentials.

The vulnerability exists due to application is using the same AES key for all installations to encrypt stored proxy and options password. A local user with access to he system can use the hard-coded key to decrypt credentials.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

TeamViewer Remote Full Client for Windows: 8.0.226330 - 14.7.224254

CPE2.3

• cpe:2.3:a:teamviewer:teamviewer:8.0.226330:*:*:*:*:*:*:*
• cpe:2.3:a:teamviewer:teamviewer:8.0.226768:*:*:*:*:*:*:*
• cpe:2.3:a:teamviewer:teamviewer:8.0.227120:*:*:*:*:*:*:*

External links

https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264
https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Security
https://twitter.com/Blurbdust/status/1224212682594770946?s=20
https://whynotsecurity.com/blog/teamviewer/
https://community.teamviewer.com/t5/Change-Logs/Windows-v14-7-39531-Full-Change-Log/td-p/90813

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.