Steps to disable the diffie-hellman-group1-sha1 algorithm in SSH

Solution Verified - Updated -

Issue

  • Vulnerability scanner detected one of the following in a RHEL-based system:

    Deprecated SSH Cryptographic Settings
      --truncated--
key exchange    diffie-hellman-group1-sha1

    Disable weak Key Exchange Algorithms

  • How to disable the diffie-hellman-group1-sha1 Key Exchange Algorithm used in SSH?

Environment

  • Red Hat Enterprise Linux (RHEL) 6, 7, 8 and 9

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