#VU21495 Authentication bypass by spoofing in Schneider Electric products - CVE-2018-7842


Vulnerability identifier: #VU21495

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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:P/U:Green]

CVE-ID: CVE-2018-7842

CWE-ID: CWE-290

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 escalate privileges on the system.


The vulnerability exists due to improperly implemented authentication schemes that are subject to spoofing attacks. A remote attacker can gain elevated privileges by conducting a brute force attack on Modbus parameters sent to the controller.

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

External links
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741

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. However, proof of concept for this vulnerability is available.


Latest bulletins with this vulnerability


Multiple vulnerabilities in Schneider Electric Modicon Controllers