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AUSCERT External Security Bulletin Redistribution
ESB-2023.6004
ICS Advisory | ICSA-23-285-08 Siemens SINEC NMS
13 October 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SINEC NMS
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-44315 CVE-2022-30527
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-285-08
Comment: CVSS (Max): 7.8 CVE-2022-30527 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-23-285-08)
Siemens SINEC NMS
Release Date
October 12, 2023
As of January 10, 2023, CISA will no longer be updating ICS security advisories
for Siemens product vulnerabilities beyond the initial advisory. For the most
up-to-date information on vulnerabilities in this advisory, please see Siemens'
ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Siemens
o Equipment : SINEC NMS
o Vulnerabilities : Incorrect Permission Assignment for Critical Resource,
Improper Neutralization of Input During Web Page Generation ('Cross-site
Scripting')
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an authenticated
local attacker to inject arbitrary code and escalate privileges or a remote
attacker to perform a stored cross-site scripting(XSS) attack that may lead to
unintentional modification of application data by legitimate users.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products of Siemens, are affected:
o SINEC NMS: All versions prior to V2.0
3.2 Vulnerability Overview
3.2.1 INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732
The affected application assigns improper access rights to specific folders
containing executable files and libraries. This could allow an authenticated
local attacker to inject arbitrary code and escalate privileges.
CVE-2022-30527 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( CVSS:3.1/AV:L/AC:L/PR:L/UI:N
/S:U/C:H/I:H/A:H ).
3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The affected application improperly sanitizes certain SNMP configuration data
retrieved from monitored devices. An attacker with access to a monitored device
could prepare a stored cross-site scripting (XSS) attack that may lead to
unintentional modification of application data by legitimate users.
CVE-2023-44315 has been assigned to this vulnerability. A CVSS v3 base score of
4.7 has been assigned; the CVSS vector string is ( CVSS:3.1/AV:N/AC:H/PR:N/UI:R
/S:C/C:L/I:L/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens recommends the following:
o SINEC NMS: Update to V2.0 or later version .
Siemens also has identified the following specific workarounds and mitigations
users can apply to reduce risk:
o CVE-2023-44315: Restrict access to the SNMP servers in the device network.
o CVE-2022-30527: Ensure that only trusted persons have access to the system
and avoid the configuration of additional accounts.
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-160243 in
HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities, such as:
o Minimize network exposure for all control system devices and/or systems,
ensuring they are not accessible from the internet .
o Locate control system networks and remote devices behind firewalls and
isolating them from business networks.
o When remote access is required, use more secure methods, such as Virtual
Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be
updated to the most recent version available, and are only as secure as the
connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on cisa.gov . Several CISA products detailing cyber defense
best practices are available for reading and download, including Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies .
CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time.
5. UPDATE HISTORY
o October 12, 2023: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Siemens
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