Disabling SHA-1 HMAC, SHA-1 key exchange, and CBC algorithms in SSH

Solution Verified - Updated -

Issue

How to disable the following in SSH:

  • Hash-based message authentication code (HMAC) using SHA-1
  • Cipher block chaining (CBC) including the Terrapin vulnerability.
  • Diffie-hellman-group key exchange (KEX) using SHA-1

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 10
  • openssh

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