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Siemens SIMATIC S7-1500 Improper Restriction of Operations Within the Bounds of a Memory Buffer (CVE-2020-0591)

medium Tenable OT Security Plugin ID 501088

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Improper buffer restrictions in BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially enable escalation of privilege via local access.

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

- As a prerequisite for an attack, an attacker must be able to run untrusted code on affected systems. Siemens recommends limiting the possibilities to run untrusted code if possible.
- Applying a Defense-in-Depth concept can help to reduce the probability that untrusted code is run on the system.
Siemens recommends applying the Defense-in-Depth concept.

For additional information, please refer to Siemens Security Advisory SSA-501073

See Also

https://security.netapp.com/advisory/ntap-20201113-0001/

https://cert-portal.siemens.com/productcert/pdf/ssa-501073.pdf

http://www.nessus.org/u?f80d097d

https://www.cisa.gov/news-events/ics-advisories/icsa-21-131-15

Plugin Details

Severity: Medium

ID: 501088

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 5/2/2023

Updated: 7/24/2023

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2020-0591

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:L/PR:H/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:simatic_cpu_1518-4_firmware, cpe:/o:siemens:simatic_cpu_1518f-4_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2020

Vulnerability Publication Date: 11/12/2020

Reference Information

CVE: CVE-2020-0591