Detections
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1.336 RHEL-10-700640

Information

RHEL 10 must not allow users to override Secure Shell (SSH) environment variables.

GROUP ID: V-281267
RULE ID: SV-281267r1184767

SSH environment options potentially allow users to bypass access restriction in some configurations.

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 to disable unattended or automatic login via SSH.

In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line:

PermitUserEnvironment no

Restart the SSH daemon with the following command for the setting to take effect:

$ sudo systemctl restart sshd.service

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7, 800-53|CM-7a., CAT|I, CCI|CCI-000381, Rule-ID|SV-281267r1184767_rule, STIG-ID|RHEL-10-700640, Vuln-ID|V-281267

Plugin: Unix

Control ID: f3701890984dcca9fb8b84c6d19e3b1c5fc4e5f34ac808244da6f9dfc443c357