PassMark PerformanceTest before 11.1 build 1012, BurnInTest before 11.1 build 1000, and OSForensics before 11.1 build 1016 contain a privilege escalation and denial-of-service vulnerability in DirectIo64.sys that allows local attackers to read arbitrary Model-Specific Registers or write zero to any MSR through exposed IOCTLs with insufficient blocklist enforcement. Attackers can exploit the unrestricted write IOCTL to zero out the system call handler MSR, causing an immediate unrecoverable kernel crash on the next system call, or read security-sensitive MSRs used to locate kernel data structures.
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
Low
Partial data leak
Integrity
None
No 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