Siemens SCALANCE XM-400 and XR-500 Improper Validation of Integrity Check Value (CVE-2021-37182)

high Tenable OT Security Plugin ID 501062

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SCALANCE XM408-4C (All versions < V6.5), SCALANCE XM408-4C (L3 int.) (All versions < V6.5), SCALANCE XM408-8C (All versions < V6.5), SCALANCE XM408-8C (L3 int.) (All versions < V6.5), SCALANCE XM416-4C (All versions < V6.5), SCALANCE XM416-4C (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 1x230V (All versions < V6.5), SCALANCE XR524-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 24V (All versions < V6.5), SCALANCE XR524-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 2x230V (All versions < V6.5), SCALANCE XR524-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 1x230V (All versions < V6.5), SCALANCE XR526-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 24V (All versions < V6.5), SCALANCE XR526-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 2x230V (All versions < V6.5), SCALANCE XR526-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR528-6M (All versions < V6.5), SCALANCE XR528-6M (2HR2) (All versions < V6.5), SCALANCE XR528-6M (2HR2, L3 int.) (All versions < V6.5), SCALANCE XR528-6M (L3 int.) (All versions < V6.5), SCALANCE XR552-12M (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2, L3 int.) (All versions < V6.5). The OSPF protocol implementation in affected devices fails to verify the checksum and length fields in the OSPF LS Update messages. An unauthenticated remote attacker could exploit this vulnerability to cause interruptions in the network by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device.

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.

For all affected products, Siemens recommends updating to v6.5 or later.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:

- Disable OSPF in the layer 3 configuration menu (note OSPF is disabled by default). The vulnerability is not exploitable when OSPF is disabled.
- If OSPF is used, set a password for the OSPF interface, and enable MD5 authentication.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.

For more information see Siemens Security Advisory SSA-145224

Plugin Details

Severity: High

ID: 501062

Version: 1.6

Type: remote

Family: Tenable.ot

Published: 4/11/2023

Updated: 3/10/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2021-37182

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:siemens:scalance_xr528-6m_%282hr2%29_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_2x230v_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_24v_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_1x230v_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr552-12m_firmware:6.5, cpe:/o:siemens:scalance_xm408-4c_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_2x230v_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_2x230v_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_1x230v_firmware:6.5, cpe:/o:siemens:scalance_xm408-8c_firmware:6.5, cpe:/o:siemens:scalance_xm408-8c_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr552-12m_%282hr2%2c_l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr528-6m_firmware:6.5, cpe:/o:siemens:scalance_xr526-8c%2c_24v_firmware:6.5, cpe:/o:siemens:scalance_xr528-6m_%282hr2%2c_l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xm416-4c_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xr552-12m_%282hr2%29_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_1x230v_firmware:6.5, cpe:/o:siemens:scalance_xr528-6m_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xm416-4c_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_24v_%28l3_int.%29_firmware:6.5, cpe:/o:siemens:scalance_xm408-4c_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_2x230v_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_24v_firmware:6.5, cpe:/o:siemens:scalance_xr524-8c%2c_1x230v_%28l3_int.%29_firmware:6.5

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 6/14/2022

Vulnerability Publication Date: 6/14/2022

Reference Information

CVE: CVE-2021-37182

CWE: 354

ICSA: 22-167-10

Detections

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