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RHEL-07-040440 - The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon does not permit Kerberos authentication unless needed.
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 implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled for systems not using this capability.Solution
Uncomment the 'KerberosAuthentication' keyword in '/etc/ssh/sshd_config' (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to 'no':KerberosAuthentication no
The SSH service must be restarted for changes to take effect.
If Kerberos authentication is required, it must be documented, to include the location of the configuration file, with the ISSO.
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_7_V3R15_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 7 STIG v3r15
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-3f., 800-53|CM-5(1), 800-53|CM-6c., 800-53|CM-11(2), CAT|II, CCI|CCI-000318, CCI|CCI-000368, CCI|CCI-001812, CCI|CCI-001813, CCI|CCI-001814, Rule-ID|SV-204599r958796_rule, STIG-ID|RHEL-07-040440, STIG-Legacy|SV-86885, STIG-Legacy|V-72261, Vuln-ID|V-204599
Plugin: Unix
Control ID: ee26d29288ecc6932e5ec4e9c5e94549cff7b0625a53e6a3b581317f8e26a018