Vulnerability identifier: #VU18548

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2016-8368

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MELSEC-Q QJ71E71-B2
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-Q QJ71E71-B5
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-Q QJ71E71-100
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Mitsubishi Electric

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

MELSEC-Q QJ71E71-B2: All versions

MELSEC-Q QJ71E71-B5: All versions

MELSEC-Q QJ71E71-100: All versions

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External links
http://ics-cert.us-cert.gov/advisories/ICSA-16-336-03
http://www.mitsubishielectric.com/fa/document/technews/plc/fa-a-0230/faa0230.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. However, proof of concept for this vulnerability is available.