Arbitrary File Access ¶

Interesting Files To Read 🤖 ¶

• /etc/passwd, /etc/group: users and groups
• /proc/self/environ: current process environment
• /proc/self/status and /proc/self/cmdline: command
• /etc/hosts, c:\windows\system32\drivers\etc\hosts: virtual hosts
• /home/<username>/.bash_history: command history
• /etc/crontab: cron tasks
• /var/lib/dpkg/status and alternatives: installed packages
• wp-config.php and application-specific configuration files
• /etc/ssh/sshd_config: may contain usernames

LocateDB may be present and in-use. We may use it to find interesting paths. Load any of them using locate -d ./xxxdb [...]:

• /var/cache/locate/locatedb
• /var/lib/mlocate/mlocate.db
• /var/lib/plocate/plocate.db

Don't forget DNS-related files and DHCP lease files.

Interesting Files To Write 🐲 ¶

• /etc/shadow, /etc/passwd: add/edit users
• /etc/group: add/edit groups
• /etc/sudoers: add/edit privileged users

Interesting Files To Know 🕷️ ¶

These files almost always exist and return a known value:

• /proc/sys/kernel/ostype: often contains Linux
• /proc/sys/kernel/randomize_va_space: often contains 2
• /sys/module/apparmor/parameters/enabled: often contains Y\n
• /proc/sys/kernel/pid_max: often contains 32768/4194304
• /sys/class/power_supply/BAT{n}/type: often contains Battery
• /sys/class/tty/tty0/active: contains a value such as tty1
• /sys/class/power_supply/AC{n}/online: contains either 0 or 1
• /sys/class/net/eth0/type: contains 1?

• default webserver roots
• can be fuzzed
• wordlists
  • default-web-root-directory-linux.txt
  • default-web-root-directory-windows.txt
  • SecLists LFI
  • /etc/php/X.Y/apache2/php.ini (web root)
  • /etc/php/X.Y/fpm/php.ini (web root)
• C:\Windows\boot.ini

• /usr/lib/python
• /var/spool/cron/crontabs, /etc/crontab, /etc/cron.d/, /etc/cron.daily/, /etc/cron.hourly/, /etc/cron.weekly/, /etc/cron.monthly/
• /etc/php/X.X/apache2/php.ini
• /etc/apache2/sites-enabled/, /var/log/apache2/
• /proc/net/arp, /sys/class/net/eth0/address, /proc/sys/kernel/random/boot_id, /proc/self/cgroup