6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.1 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
30.7%
Successful exploitation of these vulnerabilities may allow direct attacks against the product and disclose sensitive information.
The following versions of OSIsoft PI Web API, a RESTful service access layer, are affected:
Successful exploitation of this vulnerability may allow disclosure of sensitive information.
CVE-2019-13515 has been assigned to this vulnerability. A CVSS v3 base score of 8.5 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H).
The affected product is vulnerable to a direct attack due to a cross-site request forgery protection setting that has not taken effect.
CVE-2019-13516 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
OSIsoft reported these vulnerabilities to CISA.
OSIsoft recommends users upgrade to PI Web API 2018 SP1 or later to resolve these issues. To download PI Web API 2018 SP1, please access the OSIsoft customer portal (login required).
To avoid exposing sensitive information in the PI Web API Application Debug log, ensure that the Debug log is disabled on the Windows machine running PI Web API. Follow these steps to disable the Debug log:
1. Open Command Prompt and run the command eventvwr.msc.
2. Navigate to View > Show Analytic and Debug Logs.
3. Under Applications and Services Logs, find the PIWebAPI folder.
4. Right click on the log entitled Debug, and click Disable Log.
Also be sure to clear existing entries in the Debug log.
Assuming the log is Disabled but contains Events (e.g., after a troubleshooting session), enable the log and then disable it immediately.
If the log is already enabled, disable it, enable it, and finally disable it again to wipe out the contents.
The CSRF defense is enabled by default in new installations of PI Web API. OSIsoft recommends leaving the EnableCSRFDefense configuration setting unchanged so that the CSRF defense is always in effect. If it is necessary to toggle this setting, OSIsoft recommends restarting the PI Web API service after changing the state.
For more information on these vulnerabilities, please refer to OSIsoftβs Security Bulletin:
PI Web API Multiple security vulnerabilities resolved
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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 us-cert.gov. 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 webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13515
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13516
customers.osisoft.com/s/knowledgearticle?knowledgeArticleUrl=PI-Web-API-Multiple-security-vulnerabilities-resolved
cwe.mitre.org/data/definitions/532.html
cwe.mitre.org/data/definitions/693.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=OSIsoft%20PI%20Web%20API+https://www.cisa.gov/news-events/ics-advisories/icsa-19-225-02
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-19-225-02&title=OSIsoft%20PI%20Web%20API
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-19-225-02
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-225-02
www.us-cert.gov/ics
www.us-cert.gov/ics
www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01
www.us-cert.gov/ics/recommended-practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=OSIsoft%20PI%20Web%20API&body=www.cisa.gov/news-events/ics-advisories/icsa-19-225-02
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.1 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
30.7%