Vulnerability identifier: #VU21497

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-7845

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

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

Vendor: Schneider Electric

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when reading specific memory blocks in the controller over Modbus. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Modicon M340: All versions

Modicon M580: 1.04 - 2.41

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External links
http://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
http://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0745

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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.