ABB System 800xA Incorrect Default Permissions (CVE-2020-8473)

high Tenable OT Security Plugin ID 500944

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Insufficient folder permissions used by system functions in ABB System 800xA Base (version 6.1 and earlier) allow low privileged users to read, modify, add and delete system and application files. An authenticated attacker who successfully exploit the vulnerabilities could escalate his/her privileges, cause system functions to stop and to corrupt user applications.

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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.

ABB recommends changing any user account passwords suspected to be known by an unauthorized person. Interactive logon (both local and remote) is recommended to be disabled for the service account.

The vulnerabilities in the OPC Server for AC 800M was corrected in System 800xA 6.1

In the Control Builder M Professional, MMS Server for AC 800M and Base Software for SoftControl and ABB System 800xA Base, the vulnerabilities will be corrected in future releases of System 800xA. These vulnerabilities are planned to be corrected in the next release on the 6.0.3 LTS track following 6.0.3.3

Please note these vulnerabilities can only be exploited by authenticated users, so users are recommended to ensure only authorized persons have access to user accounts in System 800xA.

For more information please refer to ABB’s Cybersecurity Advisory.

Plugin Details

Severity: High

ID: 500944

Version: 1.4

Type: remote

Family: Tenable.ot

Published: 3/29/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2020-8473

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/a:abb:800xa_base_system

Required KB Items: Tenable.ot/ABB

Exploit Ease: No known exploits are available

Patch Publication Date: 4/29/2020

Vulnerability Publication Date: 4/29/2020

Reference Information

CVE: CVE-2020-8473

CWE: 732

Detections

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