Multiple vulnerabilities in Schneider Electric Modicon Controllers

Published: 2020-01-17

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-7794 CVE-2019-6856
CWE-ID	N/A
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Modicon M580 Hardware solutions / Firmware Modicon M340 Hardware solutions / Firmware Modicon Premium Hardware solutions / Firmware Modicon Quantum Hardware solutions / Firmware
Vendor	Schneider Electric

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU24374

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7794

CWE-ID: N/A

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper check for unusual or exceptional conditions. A remote attacker can cause a denial of service condition when reading data with invalid index using Modbus TCP.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Modicon M580: 1.04 - 2.50

Modicon M340: before 3.01

Modicon Premium: before 3.20

Modicon Quantum: before 3.52

External links

http://www.se.com/ww/en/download/document/SEVD-2019-344-01

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.

2) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU24373