Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric Hardware solutions

#VU54511 Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric Hardware solutions

Published: 2021-07-02

Vulnerability identifier: #VU54511

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-20593

CWE-ID: CWE-303

Exploitation vector: Network

Exploit availability: No

Vendor: Mitsubishi Electric

Description

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The vulnerability exists due to incorrect implementation of the authentication algorithm. A remote authenticated attacker can impersonate an administrator and tamper with information (e.g., operation information and configuration of the air conditioning system).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

G-50A: 2.50 - 3.35

GB-50A: 2.50 - 3.35

AG-150A-A: 3.20

AG-150A-J: 3.20

GB-50ADA-A: 3.20

GB-50ADA-J: 3.20

EB-50GU-A: 7.09

EB-50GU-J: 7.09

AE-200A: 7.93

AE-200E: 7.93

AE-50A: 7.93

AE-50E: 7.93

EW-50A: 7.93

EW-50E: 7.93

TE-200A: 7.93

TE-50A: 7.93

TW-50A: 7.93

CMS-RMD-J: 1.30

PAC-YG50ECA: 2.20

External links
http://ics-cert.us-cert.gov/advisories/icsa-21-182-04

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

Latest bulletins with this vulnerability

Multiple vulnerabilities in Mitsubishi Electric Air Conditioning System