LinEnum v0.6 – Scripted Local Linux Enumeration and Privilege Escalation Checks

LinEnum v0.6 – Scripted Local Linux Enumeration and Privilege Escalation Checks

LinEnum will automate many of the checks that I’ve documented in the Local Linux Enumeration & Privilege Escalation Cheatsheet. It’s a very basic shell script that performs over 65 checks, getting anything from kernel information to locating possible escalation points such as potentially useful SUID/GUID files and Sudo/rhost mis-configurations and more.


General usage:
version 0.6

  • Example: ./LinEnum.sh -k keyword -r report -e /tmp/ -t
OPTIONS:
  • -k Enter keyword
  • -e Enter export location
  • -t Include thorough (lengthy) tests
  • -r Enter report name
  • -h Displays this help text

Running with no options = limited scans/no output file

  • -e Requires the user enters an output location i.e. /tmp/export. If this location does not exist, it will be created.
  • -r Requires the user to enter a report name. The report (.txt file) will be saved to the current working directory.
  • -t Performs thorough (slow) tests. Without this switch default ‘quick’ scans are performed.
  • -k An optional switch for which the user can search for a single keyword within many files (documented below).

High-level summary of the checks/tasks performed by LinEnum:

  • Kernel and distribution release details
  • System Information:
    • Hostname
    • Networking details:
    • Current IP
    • Default route details
    • DNS server information
  • User Information:
    • Current user details
    • Last logged on users
    • Shows users logged onto the host
    • List all users including uid/gid information
    • List root accounts
    • Extracts password policies and hash storage method information
    • Checks umask value
    • Checks if password hashes are stored in /etc/passwd
    • Extract full details for ‘default’ uid’s such as 0, 1000, 1001 etc
    • Attempt to read restricted files i.e. /etc/shadow
    • List current users history files (i.e .bash_history, .nano_history etc.)
    • Basic SSH checks
  • Privileged access:
    • Determine if /etc/sudoers is accessible
    • Determine if the current user has Sudo access without a password
    • Are known ‘good’ breakout binaries available via Sudo (i.e. nmap, vim etc.)
    • Is root’s home directory accessible
    • List permissions for /home/
  • Environmental:
    • Display current $PATH
    • Displays env information
  • Jobs/Tasks:
    • List all cron jobs
    • Locate all world-writable cron jobs
    • Locate cron jobs owned by other users of the system
  • Services:
    • List network connections (TCP & UDP)
    • List running processes
    • Lookup and list process binaries and associated permissions
    • List inetd.conf/xined.conf contents and associated binary file permissions
    • List init.d binary permissions
  • Version Information (of the following):
    • Sudo
    • MYSQL
    • Postgres
    • Apache
      • Checks user config
      • Shows enabled modules
  • Default/Weak Credentials:
    • Checks for default/weak Postgres accounts
    • Checks for default/weak MYSQL accounts
  • Searches:
    • Locate all SUID/GUID files
    • Locate all world-writable SUID/GUID files
    • Locate all SUID/GUID files owned by root
    • Locate ‘interesting’ SUID/GUID files (i.e. nmap, vim etc)
    • List all world-writable files
    • Find/list all accessible *.plan files and display contents
    • Find/list all accessible *.rhosts files and display contents
    • Show NFS server details
    • Locate *.conf and *.log files containing keyword supplied at script runtime
    • List all *.conf files located in /etc
    • Locate mail
  • Platform/software specific tests:
    • Checks to determine if we’re in a Docker container
    • Checks to see if the host has Docker installed

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