Schneider Electric PowerLogic PM55xx and PowerLogic PM8ECC Improper Authentication (CVE-2021-22764)

medium Tenable OT Security Plugin ID 500559

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A CWE-287: Improper Authentication vulnerability exists in PowerLogic PM55xx, PowerLogic PM8ECC, PowerLogic EGX100 and PowerLogic EGX300 (see security notification for version infromation) that could cause loss of connectivity to the device via Modbus TCP protocol when an attacker sends a specially crafted HTTP request.

This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

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

Schneider has provided the following remediations:

- Users should consider blocking HTTP access to the device at the firewall level or disable the HTTP web service to reduce the risk of exposure.
- Version 2.8.3 of the PowerLogic PM5560, 5563, 5580 firmware includes fixes for these vulnerabilities.
- Version 10.7.3 of the PowerLogic PM5561 firmware includes fixes for these vulnerabilities.
- Version 4.3.5 of the PowerLogic PM5562 firmware. includes fixes for these vulnerabilities.
- PowerLogic PM8ECC has reached end of service and is no longer supported.

Schneider Electric recommends the following industry cybersecurity best practices:

- Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network.
- Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks.
- Place all controllers in locked cabinets and never leave them in the "Program" mode.
- Never connect programming software to any network other than the network intended for that device.
- Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks.
- Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation.
- Minimize network exposure for all control system devices and systems and ensure that they are not accessible from the Internet.
- When remote access is required, use secure methods, such as virtual private networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current versionavailable. Also, understand that VPNs are only as secure as the connected devices.

For more information refer to the Schneider Electric Recommended Cybersecurity Best Practices document and the associated Schneider Electric Security Notification SEVD-2021-159-02 in PDF and CSAF.

Plugin Details

Severity: Medium

ID: 500559

Version: 1.11

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 12/18/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 1.4

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-2021-22764

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

CPE: cpe:/o:schneider-electric:powerlogic_pm5560_firmware, cpe:/o:schneider-electric:powerlogic_pm5563_firmware, cpe:/o:schneider-electric:powerlogic_pm5561_firmware, cpe:/o:schneider-electric:powerlogic_pm5562_firmware

Required KB Items: Tenable.ot/Schneider

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2021

Vulnerability Publication Date: 6/11/2021

Reference Information

CVE: CVE-2021-22764

CWE: 287

ICSA: 24-331-01

Detections

Analytics