#VU54511 Incorrect Implementation of Authentication Algorithm in Mitsubishi Electric products - CVE-2021-20593
Vulnerability identifier: #VU54511
Vulnerability risk: Medium
CVSSv4.0: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-303
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
G-50A
Hardware solutions /
Firmware
GB-50A
Hardware solutions /
Firmware
AG-150A-A
Hardware solutions /
Firmware
AG-150A-J
Hardware solutions /
Firmware
GB-50ADA-A
Hardware solutions /
Firmware
GB-50ADA-J
Hardware solutions /
Firmware
EB-50GU-A
Hardware solutions /
Firmware
EB-50GU-J
Hardware solutions /
Firmware
AE-200A
Hardware solutions /
Firmware
AE-200E
Hardware solutions /
Firmware
AE-50A
Hardware solutions /
Firmware
AE-50E
Hardware solutions /
Firmware
EW-50A
Hardware solutions /
Firmware
EW-50E
Hardware solutions /
Firmware
TE-200A
Hardware solutions /
Firmware
TE-50A
Hardware solutions /
Firmware
TW-50A
Hardware solutions /
Firmware
CMS-RMD-J
Hardware solutions /
Firmware
PAC-YG50ECA
Hardware solutions /
Firmware
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
https://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.
