Vulnerability identifier: #VU14553

Vulnerability risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7790

CWE-ID: CWE-199

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 information management error. A remote attacker can connect to a Modicon M221, upload the original program from the PLC and replay authentication sequences.

Mitigation
Update to version 1.6.2.0.

Vulnerable software versions

Modicon M221: All versions

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External links
http://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.