#VU21488 Uncaught Exception in Modicon M580 - CVE-2018-7854

Vulnerability identifier: #VU21488

Vulnerability risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2018-7854

CWE-ID: CWE-248

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Modicon M580
Hardware solutions / Firmware

Vendor: Schneider Electric

Description
The vulnerability allows a remote attacker to cause a denial of service (DoS) condition on the target system.

The vulnerability exists due to uncaught exception vulnerability when sending invalid debug parameters to the controller over Modbus. A remote attacker can cause a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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-2019-0765

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