Detections
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AZLX-23-001220 - Amazon Linux 2023 SSH daemon must 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.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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Amazon_Linux_2023_V1R4_STIG.zip
Item Details
Audit Name: DISA Amazon Linux 2023 STIG v1r4
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: 139da5556bbbe3a7cfa2dfe89e2d343a7ccdf1f851d78e44cf03794b873f248c