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5.3.14 Ensure SSH PermitUserEnvironment is disabled

Information

The PermitUserEnvironment option allows users to present environment options to the ssh daemon.

Rationale:

Permitting users the ability to set environment variables through the SSH daemon could potentially allow users to bypass security controls (e.g. setting an execution path that has ssh executing a Trojan's programs)

Solution

Edit the /etc/ssh/sshd_config file to set the parameter as follows:

PermitUserEnvironment no

Default Value:

PermitUserEnvironment no

See Also

https://workbench.cisecurity.org/files/3636

Item Details

Category: CONFIGURATION MANAGEMENT, SYSTEM AND SERVICES ACQUISITION

References: 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|CM-7(1), 800-53|CM-9, 800-53|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv7|5.1, Rule-ID|SV-204434r603261_rule

Plugin: Unix

Control ID: 37303a5ebb7bf536e7fe6067b57450470b7571f0c00c6544e813a68d9fcafbd3