Conformation of Fears, NT really is crap

["Eric Toll" <etoll () syracusesupply com>]

Microsoft Security Bulletin (MS99-046)
--------------------------------------

Patch Available to Improve TCP Initial Sequence Number Randomness
Originally Posted: October 22, 1999

Summary
=======
Microsoft has released a patch that significantly improves the randomness of
the TCP initial  sequence numbers (ISNs) generated by the TCP/IP stack in
Microsoft(r) Windows NT(r) 4.0.  Improving the randomness of ISNs eliminates
a class of potential attacks against Windows NT 4.0  systems.

Frequently asked questions regarding this vulnerability can be found
at http://www.microsoft.com/security/bulletins/MS99-046faq.asp.

Issue
=====
The ISNs used in TCP/IP sessions should be as random as possible in order to
prevent attacks such  as IP address spoofing and session hijacking. This
patch improves the randomness of the Windows  NT 4.0 TCP/IP ISN generation,
providing 15 bits of entropy.

Affected Software Versions
==========================
 - Microsoft Windows NT 4.0 Workstation
 - Microsoft Windows NT 4.0 Server
 - Microsoft Windows NT 4.0 Server, Enterprise Edition
 - Microsoft Windows NT 4.0 Server, Terminal Server Edition