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AUSCERT External Security Bulletin Redistribution
ESB-2016.2412
OSIsoft PI Web API 2015 R2 Service Account Permissions Vulnerability
14 October 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: OSIsoft PI Web
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-8353
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-287-01
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Advisory (ICSA-16-287-01)
OSIsoft PI Web API 2015 R2 Service Account Permissions Vulnerability
Original release date: October 13, 2016
Legal Notice
All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the
header. For more information about TLP, see http://www.us-cert.gov/tlp/.
OVERVIEW
OSIsoft has identified a permissions vulnerability in its own PI Web
API. OSIsoft has produced a new version to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
OSIsoft reports that the vulnerability affects the following versions of
PI Web API:
PI Web API 2015 R2 (Version 1.5.1).
IMPACT
Successful exploit of this vulnerability would allow access to the PI
System via the service account user. Unauthorized viewing or alteration of
PI System data is possible if the service account user had been configured
with elevated permissions.
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.
BACKGROUND
OSIsoft is a US-based company that maintains headquarters in San Leandro,
California, with global operations.
The affected product, PI Web API, is part of OSIsoft's PI Developer
Technologies family of products and is used to access PI system
data. According to OSIsoft, the PI Web API is deployed across several
critical infrastructure sectors. OSIsoft estimates that this product is
used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS[a]
There is a weakness in this product that may allow an attacker to access
the PI system without the proper permissions.
CVE-2016-8353[b] has been assigned to this vulnerability. A CVSS
v3 base score of 6.4 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).[c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
OSIsoft recommends upgrading to PI Web API version 2016 (1.7.0.176) or
greater to address the vulnerability.
OSIsoft recommends configuring least privilege mappings in the PI System
for the PI Web API service account user. If the PI Web API service account
user is a domain account, the implicit default mappings are to the Everyone
and PIWorld PI identities, which typically serve read-only access roles.
OSIsoft also recommends using a host-based firewall to limit access to PI
Web API port 443 to only trusted workstations and software.
For more information on this vulnerability, please refer to OSIsoft's
Security Bulletin AL00306 on this topic, which was released on OSIsoft's
web site on September 13, 2016:
https://techsupport.osisoft.com/Troubleshooting/Alerts/AL00306
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.
a.
CWE-264: Permissions, Privileges, and Access Controls,
https://cwe.mitre.org/data/definitions/264.html, web site last accessed
October 13, 2016.
b.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8353,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
c.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S...,
web site last accessed October 13, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
this product.
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