SB2021090804 - Multiple vulnerability in Mitsubishi Electric MELSEC iQ-R Series

Description

This security bulletin contains information about 3 vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2021-20594)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote attacker can perform a brute-force attack and gain unauthorized access to sensitive information on the system.

2) Insufficiently protected credentials (CVE-ID: CVE-2021-20597)

CWE-ID: CWE-522 - Insufficiently Protected Credentials

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficiently protected credentials. A remote attacker can obtain unprotected credentials by sniffing network traffic.

3) Overly Restrictive Account Lockout Mechanism (CVE-ID: CVE-2021-20598)

CWE-ID: CWE-645 - Overly Restrictive Account Lockout Mechanism

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to overly restrictive account lockout mechanism. A remote attacker can lock out a legitimate user by continually attempting to login with a known username and incorrect passwords.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://jvn.jp/vu/JVNVU98578731/index.html
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdf