Title: Microsoft NT 4.0 OffloadModExpo Registry Permissions Vulnerability
Severity: LOW
Description:
Default registry permissions leave Microsoft NT 4.0 in a vulnerable state that would allow a local user to manipulate other users' cryptographic keys by creating and installing a DLL file, and specifying it as a hardware accelerator device driver in the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Offload\ExpoOffload key.
Any CSP (Cryptographic Service Provider) that then checked this key would use the attacker's code to perform crypto calculations. That code could then copy of modify the resulting key.
Affected Products:
- Microsoft Windows NT 4.0
- Microsoft Windows NT 4.0 alpha
- Microsoft Windows NT Enterprise Server 4.0
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Terminal Server 4.0
- Microsoft Windows NT Terminal Server 4.0 alpha
- Microsoft Windows NT Workstation 4.0
References:
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin (MS00-024)
- Microsoft: Q259496: Incorrect Registry Setting May Allow Cryptography Key Compromise
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