Ubuntu patch FYI

Alan DeKok aland at deployingradius.com
Tue Feb 25 23:41:55 CET 2020

On Feb 25, 2020, at 12:43 PM, Danner, Mearl <jmdanner at samford.edu> wrote:
> Just got this from a wireless lan list:
> "We has been struggling with a recent patch from Ubuntu that broke encrypted connections
> between some of our internal servers.
> Long story short: Ubuntu now uses GNU-TLS and the latest security patch has removed support for SHA-1.
> Error messages in Ubuntu or in LDAP were not explicit enough to make it obvious.

  SHA-1 has been deprecated for years.

> Some of you may face this issue between RADIUS and LDAP (still used quite a bit for 802.1X).
> This issue will most likely affect internally issued infrastructure certificates!
> Fix: Do not patch GNU-TLS (is this a good idea?) or recreate your ROOT CA to support SHA-2 family"

  You should use SHA-2 for all of your certs.  Everyone should have switched to that years ago.  :(

  Alan DeKok.

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