Title: NT Blank Password SP4 Vulnerability
Severity: HIGH
Description:
Windows NT 4.0 SP4 introduced a logic error in the network authentication process for "downlevel" clients. When a user changes his or her password (on an NT 4.0 SP4 server) from a Windows for Workgroups, OS/2, or Macintosh client, the LanMan hash is properly updated, however, the NT hash is reset to a null value. This vulnerability would allow a user to logon to the host or domain from a Win9x or NT machine by presenting the username and a blank password.
Affected Products:
- Microsoft Windows NT 4.0 SP4
- Microsoft Windows NT Enterprise Server 4.0 SP4
- Microsoft Windows NT Server 4.0 SP4
- Microsoft Windows NT Terminal Server 4.0 SP4
- Microsoft Windows NT Workstation 4.0 SP4
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