Siemens SICAM A8000 Devices Improper Limitation of a Pathname to a Restricted Directory (CVE-2023-42796)

high Tenable OT Security Plugin ID 501752

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), CP-8050 MASTER MODULE (All versions < CPCI85 V05.11). The web server of affected devices fails to properly sanitize user input for the /sicweb-ajax/tmproot/ endpoint. This could allow an authenticated remote attacker to traverse directories on the system and download arbitrary files. By exploring active session IDs, the vulnerability could potentially be leveraged to escalate privileges to the administrator role.

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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 released updates for the affected products and recommends users update to the latest versions.:

- Update to CPCI85 V05.11 or later version

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

- Restrict network access to the integrated web server.
- Review the list of users that are allowed to log in to the integrated web server and apply strong passwords.

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-770890 in HTML and CSAF.

Plugin Details

Severity: High

ID: 501752

File Name: tenable_ot_siemens_CVE-2023-42796.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 10/16/2023

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2023-42796

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/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-2023-42796

CWE: 22

Detections

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