Individual skill
pentesting-x11
Testing the X Window System (X11) display server during authorized engagements. X11 listens on TCP 6000+<display> and the local Unix socket /tmp/.X11-unix/X<display>. Covers detecting unauthenticated ("xhost +") access with nmap NSE and Metasploit, abusing MIT-MAGIC-COOKIE-1 auth tokens from ~/.Xauthority, window/clipboard enumeration, keystroke sniffing (xspy), screenshotting (xwd), live shadowing, and keystroke injection (xdotool) for command execution.
internal/tools/skills/data/network-services-pentesting/pentesting-x11/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 7, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,313
- Repository last updated
- Nov 7, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- network-services Declared skill tag
- x11 Declared skill tag
- linux Declared skill tag
- keylogging Declared skill tag
- remote-desktop Declared skill tag
- testing Derived category
Files and excerpt
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# Pentesting X11 (port 6000)
## When to Use
- During authorized assessments when TCP 6000+ is open (X11 display server)
- When testing for unauthenticated X11 access (`xhost +` style misconfiguration)
- When you have a local foothold and can read a valid `~/.Xauthority` cookie
- When you want screenshots, clipboard contents, keystroke capture, or input injection from an X session
- When pivoting from a captured display to command execution on the host
## Quick Enumeration
```bash
# Check for anonymous (open) X11 access