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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
Showing SKILL.md
| name | cis-ubuntu2004-v300-1-7-5 |
| description | Ensure GDM screen locks cannot be overridden |
| category | cis-networking |
| version | 3.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-20.04","gnome","gdm","screen-lock","dconf"] |
| cis_id | 1.7.5 |
| cis_benchmark | CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
GNOME Desktop Manager can lock down specific settings by using the lockdown mode in dconf to prevent users from changing specific settings.
To lock down a dconf key or subpath, create a locks subdirectory in the keyfile directory. The files inside this directory contain a list of keys or subpaths to lock. Just as with the keyfiles, you may add any number of files to this directory.
Setting a lock-out value reduces the window of opportunity for unauthorized user access to another user's session that has been left unattended.
Without locking down the system settings, user settings take precedence over the system settings.
Run the following commands to verify that the screen lock cannot be overridden:
# grep -Psi "idle-delay|lock-delay|lock-enabled" /etc/dconf/db/*/locks/*
/org/gnome/desktop/session/idle-delay
/org/gnome/desktop/screensaver/lock-delay
/org/gnome/desktop/screensaver/lock-enabled
All three lock entries should be present: idle-delay, lock-delay, and lock-enabled.
/etc/dconf/db/local.d/locks/00-screensaver with the following content:# Lock desktop screensaver settings
/org/gnome/desktop/session/idle-delay
/org/gnome/desktop/screensaver/lock-delay
/org/gnome/desktop/screensaver/lock-enabled
# dconf update
Note:
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 4.3 Configure Automatic Session Locking on Enterprise Assets | * | * | * |
| v7 | 16.11 Lock Workstation Sessions After Inactivity | * | * | * |
MITRE ATT&CK Mappings: T1456 | TA0027 | M1001