hacktricks/linux-hardening/linux-privilege-escalation-checklist.md
2022-05-01 13:25:53 +00:00

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Checklist - Linux Privilege Escalation

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Best tool to look for Linux local privilege escalation vectors: LinPEAS

System Information

Drives

  • List mounted drives
  • Any unmounted drive?
  • Any creds in fstab?

Installed Software

Processes

  • Is any unknown software running?
  • Is any software with more privileges that it should have running?
  • Search for exploits for running processes (specially if running of versions)
  • Can you modify the binary of any running process?
  • Monitor processes and check if any interesting process is running frequently
  • Can you read some interesting process memory (where passwords could be saved)?

Scheduled/Cron jobs?

Services

  • Any writable .service file?
  • Any writable binary executed by a service?
  • Any writable folder in systemd PATH?

Timers

  • Any writable timer?

Sockets

  • Any writable .socket file?
  • Can you communicate with any socket?
  • HTTP sockets with interesting info?

D-Bus

  • Can you communicate with any D-Bus?

Network

  • Enumerate the network to know where you are
  • Open ports you couldn't access before getting a shell inside the machine?
  • Can you sniff traffic using tcpdump?

Users

  • Generic users/groups enumeration
  • Do you have a very big UID? Is the machine vulnerable?
  • Can you escalate privileges thanks to a group you belong to?
  • Clipboard data?
  • Password Policy?
  • Try to use every known password that you have discovered previously to login with each possible user. Try to login also without password.

Writable PATH

  • If you have write privileges over some folder in PATH you may be able to escalate privileges

SUDO and SUID commands

Capabilities

  • Has any binary any unexpected capability?

ACLs

  • Has any file any unexpected ACL?

Open Shell sessions

  • screen
  • tmux

SSH

Interesting Files

  • Profile files - Read sensitive data? Write to privesc?
  • passwd/shadow files - Read sensitive data? Write to privesc?
  • Check commonly interesting folders for sensitive data
  • Weird Localtion/Owned files, you may have access or alter executable files
  • Modified in last mins
  • Sqlite DB files
  • Hidden files
  • Script/Binaries in PATH
  • Web files (passwords?)
  • Backups?
  • Known files that contains passwords: Use Linpeas and LaZagne
  • Generic search

Writable Files

  • Modify python library to execute arbitrary commands?
  • Can you modify log files? Logtotten exploit
  • Can you modify /etc/sysconfig/network-scripts/? Centos/Redhat exploit
  • Can you write in ini, int.d, systemd or rc.d files?

Other tricks

Support HackTricks and get benefits!

Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!

Discover The PEASS Family, our collection of exclusive NFTs

Get the official PEASS & HackTricks swag

Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.

Share your hacking tricks submitting PRs to the hacktricks github repo.