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How to Disable the diffie-hellman-group1-sha1 in SSHD (Doc ID 2522286.1)

Last updated on MAY 24, 2020

Applies to:

Linux OS - Version Oracle Linux 6.0 and later
Linux x86-64

Goal

How to disable the weak Key Exchange algorithm like diffie-hellman-group1-sha1 in sshd.
If the target is using deprecated SSH cryptographic settings to communicate. A man-in-the-middle attacker may be able to exploit this vulnerability to record the communication to decrypt the session key and even the messages.

 

Solution

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