Advisory Details

August 26th, 2021

Teamviewer TVS File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability

ZDI-21-1001
ZDI-CAN-13606

CVE ID CVE-2021-34858
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS TeamViewer
AFFECTED PRODUCTS TeamViewer
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of TVS files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS TeamViewer has issued an update to correct this vulnerability. More details can be found at:
https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1
DISCLOSURE TIMELINE
  • 2021-04-27 - Vulnerability reported to vendor
  • 2021-08-26 - Coordinated public release of advisory
CREDIT kdot
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