Detections
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AZLX-23-001215 - Amazon Linux 2023 SSH daemon must not allow Generic Security Service Application Program Interface (GSSAPI) authentication.
Information
GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing the attack surface of the system.Solution
Configure Amazon Linux 2023 so that the SSH daemon does not allow GSSAPI authentication.Add or uncomment the following line to "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d" and set the value to "no":
GSSAPIAuthentication 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-274044r1120120_rule, STIG-ID|AZLX-23-001215, Vuln-ID|V-274044
Plugin: Unix
Control ID: 34a928b8110d463da87b1c8b7b6ddef9f3dc5de8e8c462fe7da2c6e45370ed94