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RHEL-10-700520 - RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow Kerberos authentication.
Information
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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
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: 3da13be9a6a03c0db1cc97055f73c9c91ff1785afddcb025e01c6be80631ab39