AppArmorJail1
Descripción
Attention : this CTF-ATD is linked to the challenge "AppArmor Jail - Introduction"
When connecting to the administrator’s server, a restricted shell via an AppArmor policy prevents you from reading the flag even though you are the owner...
Find a way to read the flag at any cost and override the AppArmor policy in place which is configured as follows:
#include <tunables/global>
profile docker_chall01 flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/base>
  network,
  capability,
  file,
  umount,
  signal (send,receive),
  deny mount,
  deny /sys/[^f]*/** wklx,
  deny /sys/f[^s]*/** wklx,
  deny /sys/fs/[^c]*/** wklx,
  deny /sys/fs/c[^g]*/** wklx,
  deny /sys/fs/cg[^r]*/** wklx,
  deny /sys/firmware/** rwklx,
  deny /sys/kernel/security/** rwklx,
  deny @{PROC}/* w,  # deny write for all files directly in /proc (not in a subdir)
  # deny write to files not in /proc/<number>/** or /proc/sys/**
  deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
  deny @{PROC}/sys/[^k]** w,  # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
  deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w,  # deny everything except shm* in /proc/sys/kernel/
  deny @{PROC}/sysrq-trigger rwklx,
  deny @{PROC}/kcore rwklx,
  /home/app-script-ch27/bash px -> bashprof1,
Â
}
profile bashprof1 flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/base>
  #include <abstractions/bash>
 Â
  network,
  capability,
  deny mount,
  umount,
  signal (send,receive),
  deny /sys/[^f]*/** wklx,
  deny /sys/f[^s]*/** wklx,
  deny /sys/fs/[^c]*/** wklx,
  deny /sys/fs/c[^g]*/** wklx,
  deny /sys/fs/cg[^r]*/** wklx,
  deny /sys/firmware/** rwklx,
  deny /sys/kernel/security/** rwklx,
  deny @{PROC}/* w,  # deny write for all files directly in /proc (not in a subdir)
  # deny write to files not in /proc/<number>/** or /proc/sys/**
  deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
  deny @{PROC}/sys/[^k]** w,  # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
  deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w,  # deny everything except shm* in /proc/sys/kernel/
  deny @{PROC}/sysrq-trigger rwklx,
  deny @{PROC}/kcore rwklx,
  / r,
  /** mrwlk,
  /bin/** ix,
  /usr/bin/** ix,
  /lib/x86_64-linux-gnu/ld-*.so mrUx,
  deny /home/app-script-ch27/flag.txt r,
}- Start the CTF-ATD "AppArmorJail1"
- Connect via SSH to the machine on port 22222 (app-script-ch27:app-script-ch27)
- The challenge validation password is in the /home/app-script-ch27/flag.txt file
- The validation password of the CTF ATD is in the file /passwd
Tiempo de compromiso
4 horas
Sistema operativo
linux
178 Entorno virtuales
