Siemens SCALANCE X-200IRT Devices Inadequate Encryption Strength (CVE-2023-29054)

high Tenable OT Security Plugin ID 501076

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SCALANCE X200-4P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT (All versions < V5.5.2), SCALANCE X201-3P IRT PRO (All versions < V5.5.2), SCALANCE X202-2IRT (All versions < V5.5.2), SCALANCE X202-2IRT (All versions < V5.5.2), SCALANCE X202-2P IRT (All versions < V5.5.2), SCALANCE X202-2P IRT PRO (All versions < V5.5.2), SCALANCE X204IRT (All versions < V5.5.2), SCALANCE X204IRT (All versions < V5.5.2), SCALANCE X204IRT PRO (All versions < V5.5.2), SCALANCE XF201-3P IRT (All versions < V5.5.2), SCALANCE XF202-2P IRT (All versions < V5.5.2), SCALANCE XF204-2BA IRT (All versions < V5.5.2), SCALANCE XF204IRT (All versions < V5.5.2), SIPLUS NET SCALANCE X202-2P IRT (All versions < V5.5.2). The SSH server on affected devices is configured to offer weak ciphers by default. This could allow an unauthorized attacker in a man-in-the- middle position to read and modify any data passed over the connection between legitimate clients and the 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.

Siemens has released updates for the affected products and recommends updating to the latest versions:

- Update all affected products to V5.5.2 or later.

Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk identified in the vulnerability overview:

- Configure the SSH clients to use strong key exchange ciphers.
- Add only trusted SSH client public keys to the responding operating system (ROS) and allow access to those clients only.

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 the associated Siemens security advisory SSA-479249 in HTML and CSAF.

Plugin Details

Severity: High

ID: 501076

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 4/21/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2023-29054

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: 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:5, cpe:/o:siemens:scalance_x202-2p_irt_firmware, cpe:/o:siemens:scalance_x202-2p_irt_pro_firmware, cpe:/o:siemens:scalance_x204irt_firmware:5, cpe:/o:siemens:scalance_x204irt_pro_firmware, cpe:/o:siemens:scalance_xf201-3p_irt_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:siplus_net_scalance_x202-2p_irt_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 4/11/2023

Vulnerability Publication Date: 4/11/2023

Reference Information

CVE: CVE-2023-29054

CWE: 326

Detections

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