The BYOVD Trust Gap: How Vulnerable Drivers Bypass Modern Security
Bring Your Own Vulnerable Driver (BYOVD) attacks exploit a fundamental trust gap in Windows kernel security, where attackers leverage legitimate but vulnerable signed drivers to bypass endpoint protection systems. Recent analysis shows approximately 36% of catalogued vulnerable drivers remain unblocked by default Windows security policies, with attackers exploiting revoked and expired certificates that the kernel still accepts. These attacks concentrate on compromised signing certificates rather than individual drivers, allowing threat actors to generate unlimited malicious payloads using stolen cryptographic keys. The persistence of this attack vector demonstrates a structural flaw in how operating systems validate driver trust, with some vulnerable drivers remaining exploitable for years after initial disclosure. This attack method has gained renewed prominence as ransomware groups and APT actors increasingly adopt BYOVD techniques to disable security tools and establish kernel-level persistence, highlighting the urgent need for trust-based rather than signature-based defensive approaches.
Kill Chain
