SB2016120108 - Multiple vulnerabilities in Mitsubishi Electric MELSEC-Q Series Ethernet Interface Module

Description

This security bulletin contains information about 2 vulnerabilities.

1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2016-8370)

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to usage of weak cryptographic algorithms. A remote attacker with ability to perform a man-on-the-middle attack can decrypt communication between client and PLC device.

2) Input validation error (CVE-ID: CVE-2016-8368)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green

The vulnerability allows a remote attacker to connect to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send specially crafted packets to the PLC via port 5002/TCP and cause a denial of service, requiring the PLC to be reset to resume operation.

Remediation

Install update from vendor's website.

References

• https://ics-cert.us-cert.gov/advisories/ICSA-16-336-03
• https://www.mitsubishielectric.com/fa/document/technews/plc/fa-a-0230/faa0230.pdf