Denial of service in Mitsubishi Electric MELSEC iQ-F Series

1) Improper Check or Handling of Exceptional Conditions

EUVDB-ID: #VU48953

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5665

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

Exploit availability: No

Description

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

The vulnerability exists due to an improper check or handling of exceptional conditions issue. A local attacker can send a specially crafted ARP packet and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

MELSEC iQ-F series FX5U(C) CPU module: 1.060

External links

http://jvn.jp/vu/JVNVU95638588/index.html
http://us-cert.cisa.gov/ics/advisories/icsa-20-345-01
http://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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