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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-18-191-03) Tridium Niagara
17 August 2018
AusCERT Security Bulletin Summary
Product: Tridium Niagara
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
CVE Names: CVE-2017-16748 CVE-2017-16744
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1. EXECUTIVE SUMMARY
o CVSS v3 7.4
o ATTENTION: Exploitable remotely
o Vendor: Tridium
o Equipment: Niagara
o Vulnerabilities: Path Traversal, Improper Authentication
2. REPOSTED INFORMATION
This advisory was originally posted to the HSIN ICS-CERT library on July 10,
2018, and is being released to the NCCIC/ICS-CERT website.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could crash the device being
accessed; a buffer overflow condition may allow remote code execution.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following versions of Tridum Niagara are affected while running on the
Microsoft Windows operating system:
o Niagara AX Framework Version 3.8 and prior, and
o Niagara 4 Framework Versions 4.4 and prior.
4.2 VULNERABILITY OVERVIEW
4.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
A path traversal vulnerability in Tridium Niagara AX and Niagara 4 systems
installed on Microsoft Windows Systems can be exploited by leveraging valid
platform (administrator) credentials.
CVE-2017-16744 has been assigned to this vulnerability. A CVSS v3 base score
of 6.6 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:H/UI:N/S:U
4.2.2 IMPROPER AUTHENTICATION CWE-287
An attacker can log into the local Niagara platform using a disabled account
name and a blank password, granting the attacker administrator access to the
CVE-2017-16748 has been assigned to this vulnerability. A CVSS v3 base score
of 7.4 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:N/UI:N/S:U
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Johnathan Gains and Leet Cyber Security reported these vulnerabilities to
Tridium has recommended the following mitigation:
o Niagara AX v3.8: Apply Update 4 release (3.8.401), and
o Niagara 4 Framework v4.4: Apply Update 1 release (18.104.22.168.1).
For more information about these updates, please refer to the provided link:
NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual
Private Networks (VPNs), recognizing that VPNs may have vulnerabilities
and should be updated to the most current version available. Also
recognize that VPN is only as secure as the connected devices.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly
available on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for
tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. High skill
level is needed to exploit.
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