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

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-281257RHEL-10-700540SV-281257r1184757_ruleCCI-002696medium
Description
Configuring the "IgnoreUserKnownHosts" setting for the SSH daemon provides additional assurance that remote login via SSH will require a password, even in the event of misconfiguration elsewhere. 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.
STIGDate
Red Hat Enterprise Linux 10 Security Technical Implementation Guide2026-03-11

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CHG-06Control Functionality Verification
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (14) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-3(4)Discretionary Access Control
1.00
AU-12Audit Record Generation
1.00
AU-3Content of Audit Records
1.00
AU-3(1)Additional Audit Information
1.00
AU-8Time Stamps
1.00
AU-9Protection of Audit Information
1.00
CM-3(5)Automated Security Response
1.00
CM-5(1)Automated Access Enforcement and Audit Records
1.00
CM-5(6)Limit Library Privileges
1.00
CM-7(2)Prevent Program Execution
1.00

+4 more (top 10 by confidence shown)

CCI1 mapping
CCI-002696
1.00

Details

Check Text (C-281257r1184757_chk)

Verify RHEL 10 SSH daemons do not allow known hosts 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*ignoreuserknownhosts' /etc/ssh/sshd_config.d/10-stig.conf:IgnoreUserKnownHosts yes Verify the runtime setting with the following command: $ sudo sshd -T | grep -i ignoreuserknownhosts ignoreuserknownhosts yes If the "IgnoreUserKnownHosts" 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.

Fix Text (F-85723r1166722_fix)

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