Buffer overflow in Schneider Electric Modicon Controllers



Published: 2019-05-22 | Updated: 2019-10-03
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-7851
CWE-ID CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		BMxCRA312xx
Hardware solutions / Firmware

140CRA312xxx
Hardware solutions / Firmware

Modicon Premium
Hardware solutions / Firmware

Modicon M340
Hardware solutions / Firmware

Modicon M580
Hardware solutions / Firmware

Vendor Schneider Electric

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU21508

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7851

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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.


Mitigation

Install updates from vendor's website.
Note: BMXCRA31210C, BMXCRA31210 and BMXCRA31200 update to firmware V2.40.

Vulnerable software versions

BMxCRA312xx: before 2.40

140CRA312xxx: All versions

Modicon Premium: All versions

Modicon M340: before 3.01

Modicon M580: 1.04 - 2.41

External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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