Syskey reuses keystream

Overview Versions of SYSKEY in use prior to December, 1999 leave the SAM database vulnerable to cryptanalytic attacks. Description SYSKEY is a utility introduced in Microsoft Windows NT 4.0 service pack 3 to provide strong cryptographic protection to the SAM password database. The protection SYSK...

CVE-1999-0994

SYSKEY in Windows NT pre-December 1999 had a flaw that reuses part of an RC4 keystream to encrypt the SAM database. This enables dictionary attacks against SAM passwords if an attacker obtains a copy of the SAM database. Microsoft addressed this in December 1999 (MS99-056). The CERT advisory reit...

CVE-1999-0994

Windows NT with SYSKEY reuses the keystream that is used for encrypting SAM password hashes, allowing an attacker to crack passwords...