Moxa MGate 5105-MB-EIP DestIP Command Injection Remote Code Execution Vulnerability

February 11th, 2020
ZDI-20-214 ZDI-CAN-9552

CVE ID

CVE-2020-8858

CVSS Score

8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Moxa

Affected Products

MGate 5105-MB-EIP

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Moxa MGate 5105-MB-EIP. Authentication is required to exploit this vulnerability.

The specific flaw exists within the DestIP parameter within MainPing.asp. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

Additional Details

Moxa has issued an update to correct this vulnerability. More details can be found at:
https://www.moxa.com/en/support/support/security-advisory/mgate-5105-mb-eip-series-protocol-gateways-vulnerability

Disclosure Timeline

  • 2019-10-23 - Vulnerability reported to vendor
  • 2020-02-11 - Coordinated public release of advisory
  • 2020-04-01 - Advisory Updated

Credit

Dove Chiu, Philippe Lin, Charles Perine, Marco Balduzzi, Ryan Flores, Rainer Vosseler

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