Vulnerability identifier: #VU48070

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5653

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MELSEC iQ-R EtherNet/IP Network Interface Module
Hardware solutions / Firmware
MELSEC iQ-R PROFINET IO Controller Module
Hardware solutions / Firmware
MELSEC iQ-R High Speed Data Logger Module
Hardware solutions / Firmware
MELSEC iQ-R MES Interface Module
Hardware solutions / Firmware
MELSEC iQ-R OPC UA Server Module
Hardware solutions / Firmware

Vendor: Mitsubishi Electric

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote attacker can send a specially crafted packet, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

This vulnerability affects the following modules of MELSEC iQ-R Series: 

• EtherNet/IP Network Interface Module, RJ71EIP91: First 2 digits of serial number are 02 or before.
• PROFINET IO Controller Module, RJ71PN92: First 2 digits of serial number are 01 or before
• High Speed Data Logger Module,RD81DL96: First 2 digits of serial number are 08 or before
• MES Interface Module, RD81MES96N: First 2 digits of serial number are 04 or before
• OPC UA Server Module, RD81OPC96: First 2 digits of serial number are 04 or before 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MELSEC iQ-R EtherNet/IP Network Interface Module: 02

MELSEC iQ-R PROFINET IO Controller Module: 01

MELSEC iQ-R High Speed Data Logger Module: 08

MELSEC iQ-R MES Interface Module: 04

MELSEC iQ-R OPC UA Server Module: 04

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External links
http://ics-cert.us-cert.gov/advisories/icsa-20-303-02
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.