Siemens SCALANCE Products (CVE-2019-10927)

medium Tenable OT Security Plugin ID 501000

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SCALANCE SC-600 (V2.0), SCALANCE XB-200 (V4.1), SCALANCE XC-200 (V4.1), SCALANCE XF-200BA (V4.1), SCALANCE XP-200 (V4.1), SCALANCE XR-300WG (V4.1). An authenticated attacker with network access to to port 22/tcp of an affected device may cause a Denial-of-Service condition. The security vulnerability could be exploited by an authenticated attacker with network access to the affected device. No user interaction is required to exploit this vulnerability. The vulnerability impacts the availability of the affected device.

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Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Siemens currently has an update for the following product:

- SCALANCE SC-600: Update to v2.0.1

- SCALANCE XB-200: Update to v4.2
- SCALANCE XC-200: Update to v4.2
- SCALANCE XF-200BA: Update to v4.2
- SCALANCE XP-200: Update to v4.2
- SCALANCE XR-300WG: Update to v4.2

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

- Restrict access to Port 22/TCP (use the built-in firewall for SCALANCE SC-600);
- Restrict physical access to the device.

As a general security measure, Siemens strongly recommends users protect 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 Siemens’ operational guidelines for Industrial Security, and following the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-671286 at the following location: http://www.siemens.com/cert/advisories

See Also

https://cert-portal.siemens.com/productcert/pdf/ssa-671286.pdf

https://www.cisa.gov/news-events/ics-advisories/icsa-19-227-03

Plugin Details

Severity: Medium

ID: 501000

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 4/11/2023

Updated: 11/6/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2019-10927

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/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_xb-200_series_firmware:4.1, cpe:/o:siemens:scalance_xc-200_series_firmware:4.1, cpe:/o:siemens:scalance_xf-200ba_series_firmware:4.1, cpe:/o:siemens:scalance_xp-200_series_firmware:4.1, cpe:/o:siemens:scalance_xr-300wg_series_firmware:4.1

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 8/13/2019

Vulnerability Publication Date: 8/13/2019

Reference Information

CVE: CVE-2019-10927