Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Backdoor Jailbreak
Title: Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Backdoor Jailbreak
Advisory ID: ZSL-2018-5486
Type: Local/Remote
Impact: System Access
Risk: (5/5)
Release Date: 17.07.2018
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.
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
Linux 2.6.32.9 (Bin@DProBuilder) (gcc version 4.4.3)
[13.03.2018] Vendor contacted.
[09.05.2018] No response from the vendor.
[10.05.2018] Vendor contacted again.
[24.05.2018] No response from the vendor.
[25.05.2018] Vendor contacted again.
[16.07.2018] No response from the vendor.
[17.07.2018] Public security advisory released.
[2] https://cxsecurity.com/issue/WLB-2018070171
[3] https://exchange.xforce.ibmcloud.com/vulnerabilities/146619
[4] https://packetstormsecurity.com/files/148575
[23.07.2018] - Added reference [1], [2], [3] and [4]
Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk
Advisory ID: ZSL-2018-5486
Type: Local/Remote
Impact: System Access
Risk: (5/5)
Release Date: 17.07.2018
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.
Description
The web shell application includes a service called Microhard Sh that is documented only as 'reserved for internal use'. This service can be enabled by an authenticated user within the Services menu in the web admin panel. This can also be enabled via CSRF attack. When the service is enabled, a user 'msshc' is created on the system with password 'msshc' for SSH shell access on port 22. When connected, the user is dropped into a NcFTP jailed environment, that has limited commands for file transfer administration. One of the commands is a custom added 'ping' command that has a command injection vulnerability that allows the attacker to escape the restricted environment and enter into a root shell terminal that can execute commands as the root user.Vendor
Microhard Systems Inc. - http://www.microhardcorp.comAffected Version
IPn4G 1.1.0 build 1098IPn3Gb 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
Tested On
httpd-ssl-1.0.0Linux 2.6.32.9 (Bin@DProBuilder) (gcc version 4.4.3)
Vendor Status
[13.03.2018] Vulnerability discovered.[13.03.2018] Vendor contacted.
[09.05.2018] No response from the vendor.
[10.05.2018] Vendor contacted again.
[24.05.2018] No response from the vendor.
[25.05.2018] Vendor contacted again.
[16.07.2018] No response from the vendor.
[17.07.2018] Public security advisory released.
PoC
microhard_backdoor.txtCredits
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>References
[1] https://www.exploit-db.com/exploits/45041/[2] https://cxsecurity.com/issue/WLB-2018070171
[3] https://exchange.xforce.ibmcloud.com/vulnerabilities/146619
[4] https://packetstormsecurity.com/files/148575
Changelog
[17.07.2018] - Initial release[23.07.2018] - Added reference [1], [2], [3] and [4]
Contact
Zero Science LabWeb: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk
