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RHEL-09-255145 - RHEL 9 SSH daemon must not allow rhosts authentication.
Information
SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.Solution
Configure the SSH daemon to not allow rhosts authentication.Add the following line to "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d", or uncomment the line and set the value to "yes":
IgnoreRhosts yes
The SSH service must be restarted for changes to take effect:
$ sudo systemctl restart sshd.service
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_9_V2R8_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 9 STIG v2r8
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-258005r1045069_rule, STIG-ID|RHEL-09-255145, Vuln-ID|V-258005
Plugin: Unix
Control ID: 460aeacdc2b40663ab899cbcdc19c32c9ec53b2d93b471bea1578535cbe9226c