Siemens CPCI85 Firmware of SICAM A8000 Devices Use of Hard-Coded Credentials (CVE-2023-36380)

high Tenable OT Security Plugin ID 501753

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05.11 (only with activated debug support)), CP-8050 MASTER MODULE (All versions < CPCI85 V05.11 (only with activated debug support)). The affected devices contain a hard-coded ID in the SSH `authorized_keys` configuration file. An attacker with knowledge of the corresponding private key could login to the device via SSH. Only devices with activated debug support are affected.

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

- CP-8050 MASTER MODULE (6MF2805-0AA00): Update to CPCI85 V05.11 or later version.
- CP-8031 MASTER MODULE (6MF2803-1AA00): Update to CPCI85 V05.11 or later version.

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-134651 in HTML and CSAF.

Plugin Details

Severity: High

ID: 501753

File Name: tenable_ot_siemens_CVE-2023-36380.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 10/17/2023

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2023-36380

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:cp-8050_firmware:::~~cpci85~~~, cpe:/o:siemens:cp-8031_firmware:::~~cpci85~~~

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 10/10/2023

Vulnerability Publication Date: 10/10/2023

Reference Information

CVE: CVE-2023-36380

CWE: 798

Detections

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