#VU14554 Security restrictions bypass in Modicon M221 - CVE-2018-7791

Vulnerability identifier: #VU14554

Vulnerability risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-7791

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Modicon M221
Hardware solutions / Firmware

Vendor: Schneider Electric

Description

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.

Mitigation
Update to version 1.6.2.0.

Vulnerable software versions

Modicon M221: before 1.6.2.0

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External links
https://download.schneider-electric.com/files?p_enDocType=Technical+leaflet&p_File_Name=SEVD-2018-235-01-Modicon-M221.pdf&p_Doc_Ref=SEVD-2018-235-01

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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