Buffer overflow in Schneider Electric Modicon Controllers

1) Buffer overflow

EUVDB-ID: #VU21508

Risk: Medium

CVSSv4.0: 2.3 [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/E:U/U:Green]

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

Vulnerable software versions

BMxCRA312xx: All versions

140CRA312xxx: All versions

Modicon Premium: All versions

Modicon M340: All versions

Modicon M580: 1.04 - 2.41

CPE2.3

• cpe:2.3:h:schneider_electric:bmxcra312xx:*:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:140cra312xxx:*:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_premium:*:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_m340:*:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_m580:1.04:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_m580:1.13:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_m580:2.01:*:*:*:*:*:*:*

External links

https://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.