Nmap 7.91 Bugfix Release

[Gordon Fyodor Lyon <fyodor () nmap org>]

Hello everyone.  I'm glad Nmap 7.90 was so well received!  There were so
many improvements that the official announcement (
https://seclists.org/nmap-announce/2020/1) was a bit unwieldy.  So Daniel
Miller (who made most of those changes) Tweeted his top highlights at
https://twitter.com/bonsaiviking/status/1313247253197393920

While we do work hard to avoid bugs during development and to catch them
pre-release through continuous integration (CI) testing and QA, some
inevitably slip through the cracks. Especially with a release as big as
7.90. So we have released Nmap version 7.91 which resolves all of the
significant issues we've seen reported for 7.90:

   - Fixed the "time result cannot be represented in this installation"
   crash, which occurred during many script scans (including -A) on Windows if
   the user was in a time zone after Coordinated Universal Time (e.g. UTC+X
   timezones).  See https://issues.nmap.org/2136 [Clément Notin, nnposter,
   and Daniel Miller]
   - Fixed a crash in the Zenmap GUI when using the profile editor. See
   https://issues.nmap.org/2148 [Dan Miller]
   - Switched the default Windows I/O engine back to poll due to some
   problems with our IOCP engine that we need to work out. See
   https://issues.nmap.org/2139 [Dan Miller]
   - Fix server response parsing in MySQL library to prevent certain script
   crashes. See https://issues.nmap.org/2128 [nnposter]

Dan also made some fixes to the (now non-default) Windows IOCP engine and
silenced an irrelevant warning that "you haven't specified any TCP scan
type".

Nmap 7.91 source code and binary packages for Linux, Windows, and Mac are
available for free download from the usual spot:

https://nmap.org/download.html

We've also made Windows OEM builds for companies that include Nmap in their
products: https://nmap.org/oem/

Enjoy the new release! And don't forget to report any problems to the bug
tracker or dev list as described at https://nmap.org/book/man-bugs.html.

Cheers,
Gordon "Fyodor" Lyon
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