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. Was ZDI-CAN-13606.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-34858
• https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1
• https://www.zerodayinitiative.com/advisories/ZDI-21-1001/