LinEnum is a shell script that automates local information gathering tasks on Linux hosts.Over 65 checks are performed, obtaining anything from kernel information to locating possible escalation points such as potentially useful SUID/GUID files and Sudo/rhost mis-configurations etc.
Additionally, the script will also use a provided keyword to search through *.conf and *.log files. Any matches will be displayed along with the full file path and line number on which the keyword was identified (useful for finding ‘password’ and other sensitive data).
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
- List all users including uid/gid information
- List root accounts
- 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
- 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
- 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 accesible *.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
