Improper Restriction of Excessive Authentication Attempts in Mitsubishi Electric MELSEC iQ-F Series CPU Module

1) Improper Restriction of Excessive Authentication Attempts

EUVDB-ID: #VU82712

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-2023-4625

CWE-ID: CWE-307 - Improper Restriction of Excessive Authentication Attempts

Exploit availability: No

Description

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

The vulnerability exists due to improper restriction of excessive authentication attempts in the web server function. A remote attacker can prevent legitimate users from logging in to the web server function for a certain period of time

Mitigation

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

Vulnerable software versions

MELSEC iQ-F FX5U: All versions

MELSEC iQ-F FX5UC: All versions

MELSEC iQ-F FX5UC-32MT/DS-TS: All versions

MELSEC iQ-F FX5UC-32MT/DSS-TS: All versions

MELSEC iQ-F Series FX5UJ CPU module: All versions

MELSEC iQ-F FX5S: All versions

External links

http://www.cisa.gov/news-events/ics-advisories/icsa-23-306-02
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-014_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.