Siemens SCALANCE X Products Heap-Based Buffer Overflow (CVE-2020-25226)

critical Tenable OT Security Plugin ID 500740

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions < V5.2.5), SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) (All versions < V5.5.0). The web server of the affected devices contains a vulnerability that may lead to a buffer overflow condition. An attacker could cause this condition on the webserver by sending a specially crafted request. The webserver could stop and not recover anymore.

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.

Siemens has released updates for several affected products and recommends updating to the latest version(s). Siemens recommends countermeasures where fixes are not currently available.

- SCALANCE X-200 switch family (incl. SIPLUS NET variants): Update to v5.2.5 or later

- SCALANCE X-300 switch family: Update to v4.1.0 or later
- SCALANCE X-200IRT switch family (incl. SIPLUS NET variants): Update to v5.5.0 or later

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

- Limit network traffic of web servers of SCALANCE X switches to trusted connections by firewall rules (Port 443/TCP).

As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to the Siemens operational guidelines for Industrial Security and following the recommendations in the product manuals. For additional information, please refer to Siemens Security Advisory SSA-139628

Plugin Details

Severity: Critical

ID: 500740

Version: 1.6

Type: remote

Family: Tenable.ot

Published: 1/25/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2020-25226

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:/o:siemens:scalance_x204-2_firmware, cpe:/o:siemens:scalance_x204-2fm_firmware, cpe:/o:siemens:scalance_x204-2ld_firmware, cpe:/o:siemens:scalance_x204-2ld_ts_firmware, cpe:/o:siemens:scalance_x204-2ts_firmware, cpe:/o:siemens:scalance_x206-1_firmware, cpe:/o:siemens:scalance_x206-1ld_firmware, cpe:/o:siemens:scalance_x208_firmware, cpe:/o:siemens:scalance_x208pro_firmware, cpe:/o:siemens:scalance_x212-2_firmware, cpe:/o:siemens:scalance_x212-2ld_firmware, cpe:/o:siemens:scalance_x216_firmware, cpe:/o:siemens:scalance_x224_firmware, cpe:/o:siemens:scalance_x200-4p_irt_firmware, cpe:/o:siemens:scalance_x201-3p_irt_firmware, cpe:/o:siemens:scalance_x201-3p_irt_pro_firmware, cpe:/o:siemens:scalance_x202-2irt_firmware, cpe:/o:siemens:scalance_x202-2p_irt_firmware, cpe:/o:siemens:scalance_x202-2p_irt_pro_firmware, cpe:/o:siemens:scalance_x204irt_firmware, cpe:/o:siemens:scalance_x204irt_pro_firmware, cpe:/o:siemens:scalance_xf201-3p_irt_firmware, cpe:/o:siemens:scalance_xf204_firmware, cpe:/o:siemens:scalance_xf204-2_firmware, cpe:/o:siemens:scalance_xf202-2p_irt_firmware, cpe:/o:siemens:scalance_xf204-2ba_irt_firmware, cpe:/o:siemens:scalance_xf204irt_firmware, cpe:/o:siemens:scalance_xf206-1_firmware, cpe:/o:siemens:scalance_xf208_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 1/12/2021

Vulnerability Publication Date: 1/12/2021

Reference Information

CVE: CVE-2020-25226

CWE: 122

Detections

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