Hackers Can Exploit 'Forced Authentication' to Steal Windows NTLM Tokens
Nov 28, 2023
Cyber Attack / Vulnerability
Cybersecurity researchers have discovered a case of "forced authentication" that could be exploited to leak a Windows user's NT LAN Manager (NTLM) tokens by tricking a victim into opening a specially crafted Microsoft Access file. The attack takes advantage of a legitimate feature in the database management system solution that allows users to link to external data sources , such as a remote SQL Server table. "This feature can be abused by attackers to automatically leak the Windows user's NTLM tokens to any attacker-controlled server, via any TCP port, such as port 80," Check Point security researcher Haifei Li said . "The attack can be launched as long as the victim opens an .accdb or .mdb file. In fact, any more-common Office file type (such as a .rtf ) can work as well." NTLM, an authentication protocol introduced by Microsoft in 1993, is a challenge-response protocol that's used to authenticate users during sign-in. Over the years, ...