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AUSCERT External Security Bulletin Redistribution
OSIsoft PI System Incomplete Model of Endpoint Features Vulnerability
10 November 2016
AusCERT Security Bulletin Summary
Product: PI Asset Framework (AF) Client
PI Software Development Kit (SDK)
PI Buffer Subsystem
PI Data Archive
Operating System: Windows
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2016-8365
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OSIsoft PI System Incomplete Model of Endpoint Features Vulnerability
Original release date: November 08, 2016
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OSIsoft has identified an incomplete model of endpoint features vulnerability
in OSIsoft's PI System software. OSIsoft has produced new versions to
mitigate this vulnerability.
The following PI System software versions are affected:
Applications using PI Asset Framework (AF) Client versions prior to
PI AF Client 2016, Version 2.8.0,
Applications using PI Software Development Kit (SDK) versions prior
to PI SDK 2016, Version 1.4.6,
PI Buffer Subsystem, versions prior to and including, Version 4.4, and
PI Data Archive versions prior to PI Data Archive 2015, Version
Successful exploitation of this vulnerability could cause a shutdown
of the PI Data Archive or connected applications. In the case of the PI
Buffer Subsystem Service, this shutdown can result in unrecoverable data
loss. Desktop clients, web servers, and other data access servers could
also be potential targets of this type of shutdown.
Impact to individual organizations depends on many factors that are unique
to each organization. NCCIC/ICS-CERT recommends that organizations evaluate
the impact of this vulnerability based on their operational environment,
architecture, and product implementation.
OSIsoft is a US-based company that maintains headquarters in San Leandro,
California, with global operations.
The affected products are PI AF Client, PI SDK, PI Buffer Subsystem, and
PI Data Archive. The AF Client is a repository for asset-centric models,
hierarchies, objects, and equipment. The PI SDK is a programming library
providing access to PI Servers. Both the PI AF Client and PI SDK are
frequently included with other software packages. The PI Data Archive is the
core server technology used in the PI System for real time data storage and
distribution of instrument data. PI Buffer Subsystem provides buffering for
most current PI Client applications, as well as PI Interfaces. According
to OSIsoft, these products are deployed across multiple sectors. OSIsoft
estimates that these products are used worldwide.
INCOMPLETE MODEL OF ENDPOINT FEATURES[a]
The affected products operate between endpoints without a complete model of
endpoint features potentially causing the product to perform actions based
on this incomplete model, which could result in a denial of service. OSIsoft
reports that in order to exploit the vulnerability an attacker would need
to be locally connected to a server.
CVE-2016-8365[b] has been assigned to this vulnerability. A CVSS
v3 base score of 7.1 has been assigned; the CVSS vector string is
This vulnerability is not exploitable remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
To fully address potential for data loss or disconnection due to this issue,
OSIsoft encourages users to upgrade to:
PI Buffer Subsystem, Version 4.5.0 or later,
PI AF Client 2016, Version 2.8.0 or later,
PI SDK 2016, Version 1.4.6 or later, and
PI Data Archive 2016, Version 3.4.400.1162 or later.
For additional information about the vulnerability and recommended
mitigation plan, OSIsoft's security bulletin AL00308, OSIsoft Releases
Security Updates for Core Networking Component in PI System 2016 is
available at the following location:
In order to perform the upgrades, users can use the PI AF Client 2016 Install
Kit to upgrade PI AF Client and the PI Buffer Subsystem together. Users
can use the PI SDK 2016 Install Kit to upgrade the PI SDK. If PI Buffer
Subsystem is installed on a machine without PI AF Client, users can use
the PI Interface Configuration Utility (ICU) Install Kit (184.108.40.206B)
to upgrade buffering without installing the PI AF Client software.
OSIsoft also offers the following defensive measures:
Use transport security protection for all remote connections to the
PI Data Archive Server to block attacks from adjacent networks.
PI AF Client 2015, Version 2.7 and PI Buffer Subsystem, Version 4.4
automatically enable transport security with PI Data Archive Server
2015, Version 3.4.395.64 or later when the connecting application uses
Windows Integrated Security (WIS).
In order to verify an application is connecting with WIS and using
transport security, review the PI Data Archive Server message log
entries. For each successful connection, there will be a message
with event ID 7082. The Method should be "Windows Login," and if the
connection is using transport security, then the ciphers will also
If users are running PI Data Archive PR1, Version 3.4.375.38, to
avoid data loss, it is imperative to upgrade PI SDK, PI AF Client,
and PI Buffer Subsystem nodes before the PI Data Archive.
ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of this vulnerability. Specifically, users should:
Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls,
and isolate them from the business network.
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.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT 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 in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
CWE-437: Incomplete Model of Endpoint Features,
https://cwe.mitre.org/data/definitions/437.html, web site last accessed
November 08, 2016.
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
web site last accessed November 08, 2016.
For any questions related to this report, please contact ICS-CERT at:
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
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