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RHEL-10-700530 RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow rhosts authentication.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to SI-6 via CCI-002696

Title

RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow rhosts authentication.

Control

Verify RHEL 10 SSH daemons do not allow rhosts authentication with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*ignorerhosts' /etc/ssh/sshd_config.d/10-stig.conf:IgnoreRhosts yes Verify the runtime setting with the following command: $ sudo sshd -T | grep -i ignorerhosts ignorerhosts yes If the "IgnoreRhosts" keyword is not set to "yes" in a drop-in that lexicographically precedes 50-redhat.conf, or if no output is returned, this is a finding.

Discussion

SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files.

Related controls

CCI-002696

Fix

Configure RHEL 10 SSH daemons to not allow rhosts authentication. In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line: IgnoreRhosts yes Restart the SSH service with the following command for the changes to take effect: $ sudo systemctl restart sshd.service