Vulnerability identifier: #VU48076

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5657

CWE-ID: CWE-88

Exploitation vector: Local 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 compromise the target system.

The vulnerability due to improper neutralization of argument delimiters in a command. A remote attacker on the local network can send a specially crafted packet and cause a denial-of-service condition or execute arbitrary code.

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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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