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Schneider Electric PLC Cycle Time Influences Uncontrolled Resource Consumption (CVE-2019-10953)

high Tenable OT Security Plugin ID 500868

Synopsis

The remote OT asset is affected by a vulnerability.

Description

ABB, Phoenix Contact, Schneider Electric, Siemens, WAGO - Programmable Logic Controllers, multiple versions. Researchers have found some controllers are susceptible to a denial-of-service attack due to a flood of network packets.

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Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Fixes are available in the Modicon M221 firmware v1.10.0.0 and the EcoStruxure Machine Expert – Basic v1.0 software (formerly SoMachine Basic) using either of the following options:

Use this link to download the Machine Expert Basic software.

Or run the Schneider Electric Software Update tool in order to download and install EcoStruxure Machine Expert – Basic v1.0 software.

For additional information, see the Schneider Electric security notice SEVD-2019-045-01.

Schneider Electric strongly recommends following industry cybersecurity best practices, such as:

- Physical controls should be in place so no unauthorized person would have access to the ICS and safety controllers, peripheral equipment, or the ICS and safety networks.
- All controllers should reside in locked cabinets and never be left in the “Program” mode.
- All programming software should be kept in locked cabinets and should never be connected to any network other than the network for the devices it is intended.
- All methods of mobile data exchange with the isolated network (e.g., CDs, USB drives, etc.) should be scanned before use in terminals or any node connected to these networks.
- Laptops that have connected to any other network besides the intended network should never be allowed to connect to the safety or control networks without proper sanitation.

See Also

https://ics-cert.us-cert.gov/advisories/ICSA-19-106-03

http://www.securityfocus.com/bid/108413

Plugin Details

Severity: High

ID: 500868

Version: 1.9

Type: remote

Family: Tenable.ot

Published: 3/1/2023

Updated: 12/19/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2019-10953

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:schneider-electric:modicon_m221_series_firmware

Required KB Items: Tenable.ot/Schneider

Exploit Ease: No known exploits are available

Patch Publication Date: 4/17/2019

Vulnerability Publication Date: 4/17/2019

Reference Information

CVE: CVE-2019-10953

CWE: 770

ICSA: 19-106-03