Denial of service in Mitsubishi Electric MELSEC iQ-R, iQ-F, Q, L and F series

1) Resource exhaustion

EUVDB-ID: #VU26602

Risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-5527

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to improper resource management. A remote attacker can send large amounts of data to the MELSOFT transmission port, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

MELSEC iQ-R series: All versions

MELSEC iQ-F series: All versions

MELSEC Q series: All versions

MELSEC L series: All versions

MELSEC F series: All versions

External links

http://jvn.jp/en/vu/JVNVU91553662/index.html
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf

Q & A

Can this vulnerability be exploited remotely?

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

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.

Is there known malware, which exploits this vulnerability?

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