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Siemens SCALANCE LPE9403 Incorrect Permission Assignment for Critical Resource (CVE-2021-41091)

medium Tenable OT Security Plugin ID 501886

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability was found in Moby (Docker Engine) where the data directory (typically /var/lib/docker) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files.

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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 of the affected product update to Version 2.0 or later.

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 Siemens Security Advisory SSA-222547

See Also

https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf

https://www.cisa.gov/news-events/ics-advisories/icsa-22-167-09

https://cwe.mitre.org/data/definitions/732.html

Plugin Details

Severity: Medium

ID: 501886

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 1/15/2024

Updated: 9/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2021-41091

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_lpe9403_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/14/2022

Vulnerability Publication Date: 4/10/2021

Reference Information

CVE: CVE-2021-41091

ICSA: 22-167-09