#VU21494 Improper access control in Schneider Electric products - CVE-2019-6808

Vulnerability identifier: #VU21494

Vulnerability risk: High

CVSSv4.0: 8.1 [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]

CVE-ID: CVE-2019-6808

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Modicon Quantum
Hardware solutions / Firmware
Modicon Premium
Hardware solutions / Firmware
Modicon M340
Hardware solutions / Firmware
Modicon M580
Hardware solutions / Firmware

Vendor: Schneider Electric

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote attacker can overwrite configuration settings of the controller over Modbus and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Modicon Quantum: All versions

Modicon Premium: All versions

Modicon M340: before 3.10

Modicon M580: 1.04 - 2.80

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External links
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0771

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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.