An issue was discovered in AnyDesk before 6.2.6 and 6.3.x before 6.3.5. An upload of an arbitrary file to a victim's local ~/Downloads/ directory is possible if the victim is using the AnyDesk Windows client to connect to a remote machine, if an attacker is also connected remotely with AnyDesk to the same remote machine. The upload is done without any approval or action taken by the victim.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-44426
• https://anydesk.com/en/downloads/windows
• https://argus-sec.com/discovering-tunneling-service-security-flaws-in-anydesk-remote-application/