ESB-2019.0441 - [Win] OSIsoft PI Vision: Cross-site scripting - Existing account 2019-02-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0441
                Advisory (ICSA-19-043-01) OSIsoft PI Vision
                             13 February 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           OSIsoft PI Vision
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Cross-site Scripting -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19006  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-043-01

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Advisory (ICSA-19-043-01)

OSIsoft PI Vision

Original release date: February 12, 2019

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1. EXECUTIVE SUMMARY

  o CVSS v4.8
  o ATTENTION: Low skill level to exploit
  o Vendor: OSIsoft
  o Equipment: PI Vision
  o Vulnerability: Cross-site Scripting

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to read
and modify the contents of the PI Vision web page and data related to the PI
Vision application in the victim's browser.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of PI Vision, a process visualization tool are affected:

  o PI Vision 2017, and
  o PI Vision 2017 R2

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79

The application contains a cross-site scripting vulnerability where displays
that reference AF elements and attributes containing JavaScript are affected.
This vulnerability requires the ability of authorized AF users to store
JavaScript in AF elements and attributes.

CVE-2018-19006 has been assigned to this vulnerability. A CVSS v3 base score of
4.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:R/S:C/
C:L/I:L/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Multiple
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

OSIsoft reported this vulnerability to NCCIC.

4. MITIGATIONS

OSIsoft recommends users upgrade to PI Vision 2017 R2 SP1 to address this
issue. This update can be obtained directly from OSIsoft.

Additionally, OSIsoft recommends the following defensive measures. All access
to the AF Server is protected by Windows authentication, so the modifications
to AF data items required by an attacker would have to be performed by a user
with write access to either the AF hierarchy or templates. Periodic review of
AF Server permissions to ensure only intended users are granted write access to
elements, element templates, and event frame templates is a good practice to
reduce exposure.

Similarly, which data items are available to PI Vision is controlled by the PI
Vision administrators through the administrative site. Only add data sources to
PI Vision that you can verify as legitimate with appropriate access control
configured.

For additional guidance on web security for PI Vision, please see KB01631 -
Security Tips for PI Vision using the link below:

https://techsupport.osisoft.com/Troubleshooting/KB/KB01631/

For more information on this vulnerability, please refer to OSIsoft's Security
Bulletin AL00344 using the link below:

https://techsupport.osisoft.com/Troubleshooting/Alerts/AL00344

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
Strategies .

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 this vulnerability. This
vulnerability is not exploitable remotely.

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