SB2018082906 - Multiple vulnerabilities in Schneider Electric Modicon M221
Published: August 29, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Improper check for unusual or exceptional conditions (CVE-ID: CVE-2018-7789)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to improper check for unusual or exceptional conditions. A remote attacker can send use specially crafted programming protocol frames and reboot Modicon M221.
2) Information management error (CVE-ID: CVE-2018-7790)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The vulnerability exists due to information management error. A remote attacker can connect to a Modicon M221, upload the original program from the PLC and replay authentication sequences.
3) Security restrictions bypass (CVE-ID: CVE-2018-7791)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The vulnerability exists due to improper privileges and access controls. A remote attacker can overwrite the password and upload the original program from the PLC.
4) Security restrictions bypass (CVE-ID: CVE-2018-7792)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The vulnerability exists due to improper privileges and access controls. A remote attacker can use a rainbow table and decode the password.
Remediation
Install update from vendor's website.