Siemens SIMATIC CP 343-1/CP 443-1 Modules and SIMATIC S7-300/S7-400 CPUs (CVE-2016-8672)

medium Tenable OT Security Plugin ID 500121

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in SIMATIC CP 343-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.0.53), SIMATIC CP 443-1 Advanced (incl. SIPLUS NET variant) (All versions < V3.2.17), SIMATIC S7-300 PN/DP CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP CPU family (incl. SIPLUS variants) (All versions). The integrated web server delivers cookies without the secure flag. Modern browsers interpreting the flag would mitigate potential data leakage in case of clear text transmission.

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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 provides firmware versions that fix the vulnerabilities and recommends that users update to the fixed versions:

- SIMATIC CP 343-1 Advanced: Update to v3.0.53.
- SIMATIC CP 443-1 Advanced: Update to v3.2.17.

For SIMATIC S7-300/S7-400 CPUs, Siemens recommends the following mitigations:

- Apply cell protection concept,
- Use VPN for protecting network communication between cells, and
- Apply defense-in-depth.

Siemens strongly recommends users protect network access to SIMATIC S7-300/S7-400 CPUs and to the web interface of SIMATIC CP 343-1 Advanced and CP 443-1 Advanced devices with appropriate mechanisms. Siemens also advises that users configure the protected operational environment according to Siemens’ Operational Guidelines for Industrial Security.

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-603476 at the following location: http://www.siemens.com/cert/advisories

Plugin Details

Severity: Medium

ID: 500121

Version: 1.9

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 10/1/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-8672

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

CPE: cpe:/o:siemens:simatic_cp_343-1_advanced_firmware, cpe:/o:siemens:simatic_cp_443-1_advanced_firmware, cpe:/o:siemens:simatic_s7_400_pn%2fdp_firmware, cpe:/o:siemens:simatic_et_200_cpu_firmware, cpe:/o:siemens:simatic_s7_300_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 11/23/2016

Vulnerability Publication Date: 11/23/2016

Reference Information

CVE: CVE-2016-8672

CWE: 200

ICSA: 16-327-02

Detections

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