Buffer overflow in Schneider Electric Modicon Controllers

1) Buffer overflow

EUVDB-ID: #VU21514

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-7838

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

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

CPE2.3

• cpe:2.3:h:schneider_electric:modicon_bmenoc0301:1.03:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_bmenoc0301:2.02:*:*:*:*:*:*:*
• cpe:2.3:h:schneider_electric:modicon_bmenoc0301:2.03:*:*:*:*:*:*:*
• 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/ww/en/download/document/SEVD-2019-190-03

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.