PassMark PerformanceTest before 11.1 build 1012, BurnInTest before 11.1 build 1000, and OSForensics before 11.1 build 1016 contain a hard-coded credentials vulnerability in DirectIo64.sys that allows local attackers to perform arbitrary physical memory writes by extracting an 8-byte key embedded as a hardcoded literal in the distributed binary and computing valid MD5 authentication tags for arbitrary IOCTL write requests. Attackers can additionally bypass a secondary validation gate by using the driver's own bit-clear IOCTL to clear a single bit in the gating instruction's displacement byte, causing all subsequent write requests to skip MAC verification, size checks, and Vendor ID checks entirely.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://dkom.dev/posts/directio64-disclosure/
disclosure@vulncheck.com
https://github.com/floppywiggler/directio64-disclosure
disclosure@vulncheck.com
https://www.osforensics.com/whats-new.html
disclosure@vulncheck.com
https://www.passmark.com/products/burnintest/history.php
disclosure@vulncheck.com
https://www.passmark.com/products/performancetest/history.php
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/passmark-performancetest-burnintest-and-os…
disclosure@vulncheck.com