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/benchmarks/8415

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

Plugin: Unix

Control ID: da87f13d99a262ab17cbcf60be4ab0fd2260716a906f19e887202f03ae5e1897