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Wago OpenSSL DoS Vulnerability in PLCs (CVE-2021-34581)

high Tenable OT Security Plugin ID 500669

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.

 - Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device. (CVE-2021-34581)

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

Solution

Refer to the vendor advisory.

See Also

https://cert.vde.com/en-us/advisories/vde-2021-038

Plugin Details

Severity: High

ID: 500669

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 7/21/2022

Updated: 10/17/2023

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2021-34581

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:wago:750-831_firmware, cpe:/o:wago:750-880_firmware, cpe:/o:wago:750-881_firmware, cpe:/o:wago:750-889_firmware, cpe:/o:wago:750-831%2f000-002_firmware, cpe:/o:wago:750-880%2f025-000_firmware, cpe:/o:wago:750-880%2f025-001_firmware, cpe:/o:wago:750-880%2f025-002_firmware, cpe:/o:wago:750-880%2f040-000_firmware

Required KB Items: Tenable.ot/Wago

Exploit Ease: No known exploits are available

Patch Publication Date: 8/31/2021

Vulnerability Publication Date: 8/31/2021

Reference Information

CVE: CVE-2021-34581

CWE: 772