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Description of problem:
When OpenSSL receives fragmented KeyUpdate message with application data in-between, it does not reject the connection. This is a RFC 8446 section 5.1 violation:

   -  Handshake messages MUST NOT be interleaved with other record
      types.  That is, if a handshake message is split over two or more
      records, there MUST NOT be any other records between them.


Version-Release number of selected component (if applicable):
openssl-1.1.1-8.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. run tlsfuzzer test-tls13-keyupdate.py against openssl server

Actual results:
failed cases include
  '1/4 fragmented keyupdate msg, appdata between'
  '2/3 fragmented keyupdate msg, appdata between'
  '3/2 fragmented keyupdate msg, appdata between'

Expected results:
above mentioned tests pass

Additional info:
There are also two unrelated failures:
'app data split, conversation with KeyUpdate msg'
caused by https://github.com/openssl/openssl/issues/8188
'large KeyUpdate message'
caused by https://github.com/openssl/openssl/issues/8189 and https://github.com/openssl/openssl/issues/8293

Created attachment 1587363 [details]
test log

Successfully verified with openssl-1.1.1c-1.el8.x86_64.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3700