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Siemens SCALANCE Missing Authentication for Critical Function (CVE-2020-24588)

low Tenable OT Security Plugin ID 501043

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated.
Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an adversary can abuse this to inject arbitrary network packets.

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-portal.siemens.com/productcert/html/ssa-913875.html

https://cert-portal.siemens.com/productcert/html/ssa-019200.html

https://support.industry.siemens.com/cs/ww/en/view/109996102/

https://support.industry.siemens.com/cs/ww/en/view/109805887/

https://support.industry.siemens.com/cs/ww/en/view/109808629/

https://support.industry.siemens.com/cs/ww/en/view/109802805/

https://www.cisa.gov/news-events/ics-advisories/icsa-22-104-04

Plugin Details

Severity: Low

ID: 501043

File Name: tenable_ot_siemens_CVE-2020-24588.nasl

Version: 1.4

Type: Remote

Family: Tenable.ot

Published: 4/11/2023

Updated: 4/21/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v2

Risk Factor: Low

Base Score: 2.9

Temporal Score: 2.4

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

CVSS Score Source: CVE-2020-24588

CVSS v3

Risk Factor: Low

Base Score: 3.5

Temporal Score: 3.3

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

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_w761-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w788-2_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w786-2_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w1750d_%28usa%29_firmware:8.7.1.3, cpe:/o:siemens:scalance_wam766-1_firmware:1.2.0, cpe:/o:siemens:scalance_w1788-1_m12_firmware:3.0.0, cpe:/o:siemens:scalance_w788-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_eec_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:1.2.0, cpe:/o:siemens:scalance_w734-1_rj45_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_w1748-1_m12_firmware:3.0.0, cpe:/o:siemens:scalance_wum766-1_firmware:1.2.0, cpe:/o:siemens:scalance_wam766-1_eec_firmware:1.2.0, cpe:/o:siemens:scalance_w1788-2ia_m12_firmware:3.0.0, cpe:/o:siemens:scalance_wum763-1_firmware:1.2.0, cpe:/o:siemens:scalance_w788-2_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w774-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w1750d_%28row%29_firmware:8.7.1.3, cpe:/o:siemens:scalance_w786-2ia_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w1788-2_eec_m12_firmware:3.0.0, cpe:/o:siemens:scalance_w786-2_sfp_firmware:6.6.0, cpe:/o:siemens:scalance_w786-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w721-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w748-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_wam763-1_firmware:1.2.0, cpe:/o:siemens:scalance_w774-1_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w734-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:1.2.0, cpe:/o:siemens:scalance_w774-1_rj45_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_w1750d_%28jp%29_firmware:8.7.1.3, cpe:/o:siemens:scalance_w788-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w748-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w1788-2_m12_firmware:3.0.0, cpe:/o:siemens:scalance_w722-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:1.2.0, cpe:/o:siemens:scalance_w788-2_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w738-1_m12_firmware:6.6.0

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/11/2021

Vulnerability Publication Date: 5/11/2021

Reference Information

CVE: CVE-2020-24588

CWE: 306

ICSA: 22-104-04