Detections
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Siemens SITOP UPS1600 Out-of-bounds Write (CVE-2023-26553)

medium Tenable OT Security Plugin ID 502319

Synopsis

The remote OT asset is affected by a vulnerability.

Description

mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when copying the trailing number. An adversary may be able to attack a client ntpq process, but cannot attack ntpd.

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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 recommends users to update to the latest version:

- SITOP UPS1600 10 A Ethernet/ PROFINET (6EP4134-3AB00-2AY0): Update to V2.5.4 or later version
- SITOP UPS1600 20 A Ethernet/ PROFINET (6EP4136-3AB00-2AY0): Update to V2.5.4 or later version
- SITOP UPS1600 40 A Ethernet/ PROFINET (6EP4137-3AB00-2AY0): Update to V2.5.4 or later version
- SITOP UPS1600 EX 20 A Ethernet PROFINET (6EP4136-3AC00-2AY0): Update to V2.5.4 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-238730 in HTML and CSAF.

See Also

http://www.nessus.org/u?8ce1ffb9

https://www.cisa.gov/news-events/ics-advisories/icsa-24-165-05

Plugin Details

Severity: Medium

ID: 502319

File Name: tenable_ot_siemens_CVE-2023-26553.nasl

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 7/22/2024

Updated: 2/12/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.4

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 3.8

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

CVSS Score Source: CVE-2023-26553

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.9

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

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

Vulnerability Information

CPE: cpe:/o:siemens:sitop_ups1600_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2024

Vulnerability Publication Date: 6/11/2024

Reference Information

CVE: CVE-2023-26553

CWE: 787

ICSA: 24-165-05