CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
56.2%
OSIsoft has identified an input validation vulnerability in its own PI AF Server. OSIsoft has produced a new version of PI AF Server 2016 to address this issue.
This vulnerability could be exploited remotely.
OSIsoft reports that the vulnerability affects the following products:
The issue exists in a component that ships with the PI AF Server. This component is used by other OSIsoft applications but is not normally used by user applications or users of the PI AF SDK or PI System Explorer. This component can be safely disabled following defensive measures without impacting other PI AF Server functionality with the condition that none of the listed OSIsoft applications are also being used.
An attacker who successfully exploits this vulnerability could cause the PI AF Server to stop responding.
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.
According to OSIsoft, the PI AF Server is a repository for asset-centric models, hierarchies, objects, and equipment. The PI System uses this core server technology to provide a framework for organizing and analyzing data. According to OSIsoft, PI AF is deployed across several critical infrastructure sectors. OSIsoft estimates that these products are used worldwide.
A denial-of-service impact occurs when the PI AF Server improperly handles input while processing a message from an authenticated connection.
CVE-2016-4518NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4518 , NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. The issue was rated by OSIsoft using the Common Vulnerability Scoring System (CVSS)CVSS Calculator, https://nvd.nist.gov/cvss.cfm?adv&calculator&version=2, web site last accessed June 14, 2016. as Medium (CVSS: 4.0-6.9).
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
OSIsoft recommends upgrading to PI AF Server 2016 to address this issue.
OSIsoft recommends using a host-based firewall to limit access to Port 5459 to only trusted workstations using PI SQL products such as PI OLEDB Enterprise. All versions of PI WebParts and PI Web Services will use PI OLEDB Enterprise for data access if it is configured as a provider for a relational data set. The following products access the PI AF Server 2016 over Port 5459 for search functionality:
OSIsoft also recommends that access to the PI AF Server should be limited to only those users who need it.
For more information on this vulnerability, please refer to OSIsoftโs Security Bulletin AL00301 on this topic, which was released on OSIsoftโs web site on May 10, 2016:
<https://techsupport.osisoft.com/Troubleshooting/PI-System-Cyber-Security>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 ICSโCERT Technical Information Paper, ICS-TIP-12-146-01BโTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).
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.
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
56.2%