Main Vulnerability Database Vulnerabilities #VU21508

Buffer overflow in Schneider Electric products - CVE-2018-7851

Published: October 3, 2019

Vulnerability identifier: #VU21508

CSH Severity: Medium

CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-7851

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a boundary error when sending a specially crafted Modbus packet. A remote authenticated attacker can trigger memory corruption and cause a denial of service condition to the device that would force a restart to restore availability.

Affected software

BMxCRA312xx
140CRA312xxx
Modicon Premium
Modicon M340
Modicon M580

How to mitigate CVE-2018-7851

Install updates from vendor's website.

Note: BMXCRA31210C, BMXCRA31210 and BMXCRA31200 update to firmware V2.40.

BMxCRA312xx - update to 2.40
Modicon M340 - update to 3.01
Modicon M580 - update to 2.50

External References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-10/

Related Security Bulletins