If you are using TeamViewer, then beware and make sure you’re running the latest version of the popular remote desktop connection software for Windows.
TeamViewer team recently released a new version of its software that includes a patch for a severe vulnerability (CVE 2020-13699), which, if exploited, could let remote attackers steal your system password and eventually compromise it.
What’s more worrisome is that the attack can be executed almost automatically without requiring much interaction of the victims and just by convincing them to visit a malicious web page once.
For those unaware, TeamViewer is a popular remote-support software that allows users to securely share their desktop or take full control of other’s PC over the Internet from anywhere in the world.
The remote access software is available for desktop and mobile operating systems, including Windows, macOS, Linux, Chrome OS, iOS, Android, Windows RT Windows Phone 8, and BlackBerry.
Discovered by Jeffrey Hofmann of Praetorian, the newly reported high-risk vulnerability resides in the way TeamViewer quotes its custom URI handlers, which could allow an attacker to force the software to relay an NTLM authentication request to the attacker’s system.
In simple terms, an attacker can leverage TeamViewer’s URI scheme from a web-page to trick the application installed on the victim’s system into initiating a connection to the attacker-owned remote SMB share.
images from Hacker News