Detections
Analytics
Siemens SIMATIC NET CP 443-1 OPC UA Improper Input Validation (CVE-2016-9042)
medium Tenable OT Security Plugin ID 501098
Synopsis
The remote OT asset is affected by a vulnerability.Description
An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.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 the risk:
- Deactivate NTP-based time synchronization of the device, if enabled. The feature is disabled by default.
- Configure an additional firewall to prevent communication to Port UDP/123 of an affected device.
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens operational guidelines for industrial security, and follow the recommendations in the product manual.
Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity
For more information about this issue, please see Siemens security advisory SSA-211752
See Also
http://www.nessus.org/u?39eeaa66
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
http://www.securitytracker.com/id/1039427
http://www.securitytracker.com/id/1038123
http://www.securityfocus.com/bid/97046
http://www.nessus.org/u?547120eb
https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
https://kc.mcafee.com/corporate/index?page=content&id=SB10201
http://seclists.org/fulldisclosure/2017/Nov/7
http://seclists.org/fulldisclosure/2017/Sep/62
https://support.f5.com/csp/article/K39041624
http://www.securityfocus.com/archive/1/540403/100/0/threaded
https://bto.bluecoat.com/security-advisory/sa147
http://www.securityfocus.com/archive/1/archive/1/540464/100/0/threaded
http://www.nessus.org/u?8c049474
http://www.nessus.org/u?465d82c2
http://www.securityfocus.com/archive/1/archive/1/540403/100/0/threaded
http://www.nessus.org/u?0d2e6e6d
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11
Plugin Details
Severity: Medium
ID: 501098
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: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.4
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2016-9042
CVSS v3
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 5.3
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:siemens:simatic_net_cp_443-1_opc_ua_firmware
Required KB Items: Tenable.ot/Siemens
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/4/2018
Vulnerability Publication Date: 6/4/2018
Reference Information
CVE: CVE-2016-9042