Detections
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1.52 AZLX-23-001220

Information

Amazon Linux 2023 SSH daemon must not allow Kerberos authentication.

GROUP ID: V-274045RULE ID: SV-274045r1120123

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.

Solution

Configure Amazon Linux 2023 so that the SSH daemon does not allow Kerberos authentication.

Add the following line in "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d" or uncomment the line and set the value to "no":

KerberosAuthentication no

The SSH service must be restarted for changes to take effect:

$ sudo systemctl restart sshd.service

See Also

https://workbench.cisecurity.org/benchmarks/26107

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-5(1), CAT|II, CCI|CCI-001813, Rule-ID|SV-274045r1120123_rule, STIG-ID|AZLX-23-001220, Vuln-ID|V-274045

Plugin: Unix

Control ID: 20b8d2c982ff5e5a632a55e7a7e464bdd412b5479078804fffcf5e5a733ea8a9