SB2021061704 - Multiple vulnerabilities in Automation Direct CLICK PLC CPU Modules

Description

This security bulletin contains information about 5 vulnerabilities.

1) Improper Authentication (CVE-ID: CVE-2021-32980)

CWE-ID: CWE-287 - Improper Authentication

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

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the firmware does not protect against additional software programming connections. A remote attacker can connect to the PLC while an existing connection is already active.

2) Improper Authentication (CVE-ID: CVE-2021-32984)

CWE-ID: CWE-287 - Improper Authentication

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

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to all programming connections receive the same unlocked privileges. A remote attacker can connect to the PLC and read the project without authorization, during the time the PLC is unlocked by an authorized user.

3) Improper Authentication (CVE-ID: CVE-2021-32986)

CWE-ID: CWE-287 - Improper Authentication

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

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to after the PLC is unlocked by an authorized user, the unlocked state does not timeout. A remote attacker can gain access to target system.

4) Cleartext transmission of sensitive information (CVE-ID: CVE-2021-32982)

CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/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 sensitive information.

The vulnerability exists due to software uses insecure communication channel to transmit sensitive information. A remote attacker with ability to intercept network traffic can gain access to sensitive data.

5) Unprotected storage of credentials (CVE-ID: CVE-2021-32978)

CWE-ID: CWE-256 - Unprotected Storage of Credentials

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/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 other users' credentials.

The vulnerability exists due to the programming protocol allows for a previously entered password and lock state to be read by an attacker. A remote attacker can use the password to unlock the PLC.

Remediation

Install update from vendor's website.

References

• https://ics-cert.us-cert.gov/advisories/icsa-21-166-02