It turned out that there is no network traffic, but there is still a password in the memory. Then the guy decided to check from where the TeamViewer client gets the key: from the server or the localhost. Later it turned out that this vulnerability was already known two years ago as CVE-2018-14333. Then, the specialist searched for this password in RAM using the Cheat Engine program (for hacking games under Windows) - and found it again in plain text. The scanner gave TeamViewer password in plain text. He imported them to a fresh system in a virtual machine and launched the BulletPassView scanner, which collects passwords in the system. Subsequently, he became interested in what these keys were and how TeamViewer stores passwords in general. He says that he worked for the client and during the backup, he noticed TeamViewer registry keys called OptionsPasswordAES and SecurityPasswordAES. The novice security specialist who unveiled this vulnerability stumbled upon this vulnerability by accident. This method of saving passwords and the associated privilege escalation was officially registered on February 7, 2020, as the vulnerability CVE-2019-18988 (this vulnerability applies to all versions of TeamViewer up to and including ). In short, all passwords are stored in the Windows registry in encrypted form.
Therefore, we are quite interested to see how this program stores passwords. TeamViewer is a popular program for remote desktop connection.
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