While in most cases an attacker requires an existing session on a system, if the registry/configuration keys were stored off of the machine (such as in a file share or online), an attacker could then decrypt the required password to login to the system. The latest version still uses the same key for OptionPasswordAES but appears to have changed how the Unattended Access password is stored. With versions before v9.x, this allowed for attackers to decrypt the Unattended Access password to the system (which allows for remote login to the system as well as headless file browsing). If an attacker were to know this key, they could decrypt protect information stored in the registry or configuration files of TeamViewer. It used a shared AES key for all installations since at least as far back as v8, and used it for at least OptionsPasswordAES in the current version of the product. This is to be guaranteed by the signed key exchange of two key pairs. It is the same encryption used by FastestVPN, among other features. It uses AES 256-bit encryption, which is considered as the best military-grade standards worldwide. 42 According to the manufacturer, man-in-the-middle attacks are principally not possible. TeamViewer comes with a little bit of solid security. TeamViewer Desktop through allows a bypass of remote-login access control because the same key is used for different customers' installations. TeamViewer includes end-to-end encryption based on RSA (4096 bits) and AES (256 bits).
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