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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
Based on SOC occupation classification
Showing SKILL.md
| name | cis-ubuntu1604-v200-5-3-13 |
| description | Ensure SSH PermitUserEnvironment is disabled |
| category | cis-networking |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","ssh","remote-access"] |
| cis_id | 5.3.13 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The PermitUserEnvironment option allows users to present environment options to the ssh daemon.
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).
Run the following command and verify that output matches:
sshd -T -C user=root -C host="$(hostname)" -C addr="$(grep $(hostname) /etc/hosts | awk '{print $1}')" | grep permituserenvironment
permituserenvironment no
Run the following command and verify the output:
grep -Ei '^\s*PermitUserEnvironment\s+yes' /etc/ssh/sshd_config
Nothing should be returned.
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
PermitUserEnvironment no
PermitUserEnvironment no
Version 7
5.1 Establish Secure Configurations - Maintain documented, standard security configuration standards for all authorized operating systems and software.
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