NTLM credentials are based on data obtained during the interactive logon process and consist of a domain name, a user name, and a one-way hash of the user’s password.

NTLM uses an encrypted protocol to authenticate a user without transferring the user’s password. To initiate the attack, the attacker could simply persuade a victim with TeamViewer to click on a crafted URL in a website using watering-hole attacks techniques.Īfter a victim’s TeamViewer app initiates the remote SMB share, Windows will then make the connection using NT LAN Manager (NTLM). In this specific case, values are not “quoted” by the app – meaning that TeamViewer will treat them as commands rather than as input values.Īn attacker could embed a malicious iframe in a website with a crafted URL that would launch the TeamViewer Windows desktop client and force it to open a remote SMB share.

But because handler applications can receive data from untrusted sources, the URI values passed to the application may contain malicious data that attempts to exploit the app. Apps need to identify the URIs for the websites they will handle. The flaw stems from the Desktop for Windows app not properly quoting its custom uniform resource identifier (URI) handlers. If exploited, the flaw could allow remote, unauthenticated attackers to execute code on users’ systems or crack their TeamViewer passwords. Popular remote-support software TeamViewer has patched a high-severity flaw (CVE-2020-13699, 8.8/10) in its desktop app for Windows. TeamViewer flaw in Windows app allows password-cracking

What is teamviewer used for hacking