(PT-2018-18) Positive Technologies Security Advisory
Buffer Overflow in Schneider Electric's Modicon Premium, Modicon Quantum, and Modicon M340

Vulnerable products

Modicon Premium, Modicon Quantum, and Modicon M340
Version: all versions

Link:
https://www.schneider-electric.com/

Severity level

Severity level: High
Impact: Denial of Service
Access Vector: Remote

CVSS v3:
Base Score: 7.5
Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVE: CVE-2018-7759

Vulnerability description

The specialists of the Positive Research center have detected a Buffer Overflow vulnerability in Schneider Electric's Modicon Premium, Modicon Quantum, and Modicon M340.

A buffer overflow vulnerability, due to the length of the source string specified as the number of bytes to be copied (instead of the buffer size), allows attackers to cause a denial of service.

How to fix

Use the vendor's advisory:
https://www.schneider-electric.com/en/download/document/SEVD-2018-081-02/

Advisory status

28.04.2017 - Vendor gets vulnerability details
22.03.2018 - Vendor releases fixed version and details
03.09.2018 - Public disclosure

Credits

The vulnerability was detected by Nikita Maximov, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2018-18
https://www.ptsecurity.com/ww-en/about/news/294214/

Reports on the vulnerabilities previously discovered by Positive Research:

https://www.ptsecurity.com/
https://en.securitylab.ru/lab/

About Positive Technologies

Positive Technologies is a leading digital security firm with over 15 years of experience in 360° protection of critical IT systems against the most advanced cyberthreats. State-of-the-art solutions are developed at the company's research center—one of the largest in Europe. Positive Technologies experts have helped to identify and fix over 250 zero-day vulnerabilities in products from Cisco, Google, Honeywell, Huawei, Microsoft, Oracle, SAP, Schneider Electric, Siemens, and others, earning a reputation for world-class expertise in protection of devices and infrastructures at all scales from ATMs to nuclear power stations. Findings by Positive Technologies researchers are used for updating the MaxPatrol knowledge base and for development of security solutions including PT Application Firewall, PT Application Inspector, MaxPatrol. These products allow securing web applications, evaluating network protection, blocking attacks in real time, ensuring compliance with industry and national standards, and training security specialists. Positive Technologies is the organizer of the annual Positive Hack Days international forum and security competition.