Vulnerability identifier: #VU21514

Vulnerability 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-2018-7838

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Modicon BMENOC0301
Hardware solutions / Firmware
Modicon M580
Hardware solutions / Firmware

Vendor: Schneider Electric

Description

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

The vulnerability exists due to a boundary error on the FTP service of the controller or the Ethernet BMENOC module when it receives a FTP CWD command with a data length greater than 1020 bytes. A power cycle is then needed to reactivate the FTP service. A remote attacker can trigger memory corruption and cause a denial of service.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Modicon BMENOC0301: 1.03 - 2.14

Modicon M580: 1.04 - 2.80

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External links
http://www.schneider-electric.com/ww/en/download/document/SEVD-2019-190-03

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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.