Detections
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1.324 RHEL-10-700520

Information

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

GROUP ID: V-281255
RULE ID: SV-281255r1184755

Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementations may be subject to exploitation.

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.

Solution

Configure RHEL 10 SSH daemons to not allow Kerberos authentication.

In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line:

KerberosAuthentication no

Restart the SSH service with the following command for the changes to take effect:

$ sudo systemctl restart sshd.service

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-5(1), CAT|II, CCI|CCI-001813, Rule-ID|SV-281255r1184755_rule, STIG-ID|RHEL-10-700520, Vuln-ID|V-281255

Plugin: Unix

Control ID: 0cc462d074f3446823125881ed408e6380119bf960590e5d3fe00148cd75a1eb