RE: AT&T Blocking ICMP (was RE: AT&T US Network Slowdown?)

UPDATED: The Nachi worm will infect vulnerable Windows XP and 2000 machines
using the same exploit used by the MS Blast worm family. The main difference
between Nachi and MS Blast, is that Nachi will remove and disable MS Blast
infections that it encounters, and download and install the correct MSRPC
DCOM patch from Microsoft. This action will permanently close the MSRPC
DCOM vulnerability. The Nachi worm will not patch the WebDAV vulnerability
on Windows 2000 Servers.

Patches DCOM and removes MBLAST.. Why doesn't Microsoft release this, or did
they? :).