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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-v200-5-3-7 |
| description | Ensure SSH X11 forwarding is disabled |
| category | cis-networking |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","ssh","remote-access"] |
| cis_id | 5.3.7 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The X11Forwarding parameter provides the ability to tunnel X11 traffic through an existing SSH shell session to enable remote graphic connections.
Disable X11 forwarding unless there is an operational requirement to use X11 applications directly. There is a small risk that the remote X11 servers of users who are logged in via SSH with X11 forwarding could be compromised by other users on the X11 server. Note that even if X11 forwarding is disabled, users can always install their own forwarders.
X11 programs on the server will not be able to be forwarded to a ssh-client display.
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 -i x11forwarding
x11forwarding no
Run the following command and verify that the output matches:
grep -Ei '^\s*x11forwarding\s+yes' /etc/ssh/sshd_config
Nothing is returned.
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
X11Forwarding no
X11Forwarding yes
Version 7
9.2 Ensure Only Approved Ports, Protocols and Services Are Running - Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.
Automated