Siemens SIMATIC TDC CP51M1 Improper Input Validation (CVE-2019-10937)

high Tenable OT Security Plugin ID 501640

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SIMATIC TDC CP51M1 (All versions < V1.1.7). An attacker with network access to the device could cause a Denial-of-Service condition by sending a specially crafted UDP packet. The vulnerability affects the UDP communication of the device. The security vulnerability could be exploited without authentication. No user interaction is required to exploit this security vulnerability. Successful exploitation of the security vulnerability compromises availability of the targeted system. At the time of advisory publication no public exploitation of this security vulnerability was known.

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 recommends users update to Version 1.1.7 or later. Updates can be obtained at the following link:

https://support.industry.siemens.com/cs/ww/en/view/27049282

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

- Restrict network access to affected devices
- Restrict UDP communication to affected devices
- Do not use UDP communication in the user program if not needed
- Apply cell protection concept and implement defense in depth

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 users configure the environment according to Siemens’ operational guidelines for industrial security (download:
https://www.siemens.com/cert/operational-guidelines-industrial-security), and follow the recommendations in the product manuals. Additional information on industrial security by Siemens can be found at:

https://www.siemens.com/industrialsecurity

For more information, please see Siemens Security Advisory SSA-250618 at the following location:

http://www.siemens.com/cert/advisories

Plugin Details

Severity: High

ID: 501640

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 9/14/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2019-10937

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:simatic_tdc_cp51m1_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 9/13/2019

Vulnerability Publication Date: 9/13/2019

Reference Information

CVE: CVE-2019-10937

CWE: 20

Detections

Analytics