11/19/2023 0 Comments Teamviewer client id registry| Last round of AES decryption, using Equivalent Inverse Cipher, 128-bit data (state) from xmm2 with a 128-bit round key from xmm3/m128 store the result in xmm1.Ġ08FDC90 01 00 01 00 67 24 4F 43 6E 67 62 F2 5E A8 D7 04. Movdqa xmm1,xmmword ptr ds: | =79 DC 78 A6 67 50 73 8F E7 E6 57 8F 18 7A B7 06Īesdec xmm0,xmm1 | do the actual decryption Movdqa xmmword ptr ds:,xmm0 | = 6F AA 98 76 DE 11 7D 8D 7E B6 EE 61 2D 3D 15 52 Movdqa xmm0,xmmword ptr ds: | = D3214559577E59EF04358B2A0ED56AC0Īesdec xmm0,xmm1 | One round of an AES decryption, using Equivalent Inverse Cipher, 128-bit data (state) from xmm1 with 128-bit round key from xmm2/m128 store the result in xmm1. Movdqa xmm1,xmmword ptr ds: | = 25C8C8BD4298BB32A57EECBDBD045BBB Six hours later, he found the TeamViewer code snippet responsible for AES encryption. It turned out that this is a very simple process, for which it is enough to use a debugger. While searching for information, he found out that a lot of people were already wondering how to find AES keys for Unity games in the resources. The reverse engineering of TeamViewer binary code using IDA Pro, API Monitor, procdump and Frida took a few weeks for him, but it didn’t give any positive result, although the guy mastered several new tools along the way, so the process cannot be called useless. 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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