Detections
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Siemens SCALANCE X-200RNA Switch Devices Inappropriate Encoding For Output Context (CVE-2019-6110)

medium Tenable OT Security Plugin ID 500838

Synopsis

The remote OT asset is affected by a vulnerability.

Description

In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in- The-Middle attacker) can manipulate the client output, for example to use ANSI control codes to hide additional files being transferred.

 - In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-The-Middle attacker) can manipulate the client output, for example to use ANSI control codes to hide additional files being transferred. (CVE-2019-6110)

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 released updates for the affected product and recommends updating to the latest version:

- Update to V3.2.7 or later version.

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

- Restrict access to the affected systems, especially to ports 22/tcp and 443/tcp to trusted IP addresses only.
- Deactivate the webserver if not required, and if deactivation is supported by the product.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following the recommendations in the product manuals.
Siemens provides additional information on industrial security.

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact Siemens.

For more information, see the associated Siemens security advisory SSA-412672 in HTML and CSAF.

See Also

https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

https://www.cisa.gov/news-events/ics-advisories/icsa-22-349-21

https://cvsweb.openbsd.org/src/usr.bin/ssh/scp.c

https://cvsweb.openbsd.org/src/usr.bin/ssh/progressmeter.c

https://www.exploit-db.com/exploits/46193/

https://security.netapp.com/advisory/ntap-20190213-0001/

https://security.gentoo.org/glsa/201903-16

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Plugin Details

Severity: Medium

ID: 500838

Version: 1.5

Type: remote

Family: Tenable.ot

Published: 2/23/2023

Updated: 12/12/2023

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.1

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

CVSS Score Source: CVE-2019-6110

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 6.1

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

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_x204rna_eec_firmware, cpe:/o:siemens:scalance_x204rna_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/31/2019

Vulnerability Publication Date: 1/31/2019

Reference Information

CVE: CVE-2019-6110

CWE: 838

GLSA: GLSA-201903-16