NT Syskey Reused Keystream Vulnerability

Bugtraq ID:	873
Class:	Design Error
CVE:
Remote:	Yes
Local:	Yes
Published:	Dec 16 1999 12:00AM
Updated:	Dec 16 1999 12:00AM
Credit:	Discovered by BindView, published in a BindView Security Advisory on December 16, 1999.
Vulnerable:	Microsoft Windows NT 4.0 SP6 + Microsoft Windows NT Enterprise Server 4.0 SP6 + Microsoft Windows NT Enterprise Server 4.0 SP6 + Microsoft Windows NT Server 4.0 SP6 + Microsoft Windows NT Server 4.0 SP6 + Microsoft Windows NT Terminal Server 4.0 SP6 + Microsoft Windows NT Terminal Server 4.0 SP6 + Microsoft Windows NT Workstation 4.0 SP6 + Microsoft Windows NT Workstation 4.0 SP6 Microsoft Windows NT 4.0 SP5 + Microsoft Windows NT Enterprise Server 4.0 SP5 + Microsoft Windows NT Enterprise Server 4.0 SP5 + Microsoft Windows NT Server 4.0 SP5 + Microsoft Windows NT Server 4.0 SP5 + Microsoft Windows NT Terminal Server 4.0 SP5 + Microsoft Windows NT Terminal Server 4.0 SP5 + Microsoft Windows NT Workstation 4.0 SP5 + Microsoft Windows NT Workstation 4.0 SP5 Microsoft Windows NT 4.0 SP4 + Microsoft Windows NT Enterprise Server 4.0 SP4 + Microsoft Windows NT Enterprise Server 4.0 SP4 + Microsoft Windows NT Server 4.0 SP4 + Microsoft Windows NT Server 4.0 SP4 + Microsoft Windows NT Terminal Server 4.0 SP4 + Microsoft Windows NT Terminal Server 4.0 SP4 + Microsoft Windows NT Workstation 4.0 SP4 + Microsoft Windows NT Workstation 4.0 SP4 Microsoft Windows NT 4.0 SP3 + Microsoft Windows NT Enterprise Server 4.0 SP3 + Microsoft Windows NT Enterprise Server 4.0 SP3 + Microsoft Windows NT Server 4.0 SP3 + Microsoft Windows NT Server 4.0 SP3 + Microsoft Windows NT Terminal Server 4.0 SP3 + Microsoft Windows NT Terminal Server 4.0 SP3 + Microsoft Windows NT Workstation 4.0 SP3 + Microsoft Windows NT Workstation 4.0 SP3 Microsoft Windows NT 4.0 SP2 + Microsoft Windows NT Enterprise Server 4.0 SP2 + Microsoft Windows NT Enterprise Server 4.0 SP2 + Microsoft Windows NT Server 4.0 SP2 + Microsoft Windows NT Server 4.0 SP2 + Microsoft Windows NT Terminal Server 4.0 SP2 + Microsoft Windows NT Terminal Server 4.0 SP2 + Microsoft Windows NT Workstation 4.0 SP2 + Microsoft Windows NT Workstation 4.0 SP2 Microsoft Windows NT 4.0 SP1 + Microsoft Windows NT Enterprise Server 4.0 SP1 + Microsoft Windows NT Enterprise Server 4.0 SP1 + Microsoft Windows NT Server 4.0 SP1 + Microsoft Windows NT Server 4.0 SP1 + Microsoft Windows NT Terminal Server 4.0 SP1 + Microsoft Windows NT Terminal Server 4.0 SP1 + Microsoft Windows NT Workstation 4.0 SP1 + Microsoft Windows NT Workstation 4.0 SP1 Microsoft Windows NT 4.0 + Microsoft Windows NT Enterprise Server 4.0 + Microsoft Windows NT Enterprise Server 4.0 + Microsoft Windows NT Server 4.0 + Microsoft Windows NT Server 4.0 + Microsoft Windows NT Terminal Server 4.0 + Microsoft Windows NT Terminal Server 4.0 + Microsoft Windows NT Workstation 4.0 + Microsoft Windows NT Workstation 4.0
Not Vulnerable:

NT Syskey Reused Keystream Vulnerability

Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].

NT Syskey Reused Keystream Vulnerability

Solution:
Microsoft has released a patch for Syskey, available at:

x86:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16798
alpha:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16799

NT Syskey Reused Keystream Vulnerability

References:

• Microsoft Security Bulletin MS99-056: Frequently Asked Questions (Microsoft)
  
• Q143475: Windows NT System Key Permits Strong Encryption of the SAM (Microsoft)