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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0078
                         Advisory (ICSA-17-010-01)
                              11 January 2017

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

Product:           OSIsoft PI Coresight and PI Web API
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2017-5153  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-010-01

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Advisory (ICSA-17-010-01)
CVSS V3 6.1

Original release date: January 10, 2017

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/.

Vendor: OSIsoft
Equipment: PI Coresight, PI Web API
Vulnerability: Information Exposure Through Server Log Files

AFFECTED PRODUCTS

OSIsoft reports that the vulnerability affects the following versions:

    PI Coresight 2016 R2 and earlier versions, and
    PI Web API 2016 R2 when deployed using the PI AF Services 2016 R2
    integrated install kit.

IMPACT

Anyone with access to the server file system can obtain the service account
passwords for the affected services. This is accomplished by examining
the installation log file when a nondefault service account and password
are specified during installation or upgrade. This potentially leads to
unauthorized shutdown of the affected PI services as well as potential
reuse of domain credentials.

MITIGATION

The recommendation is to follow the workaround detailed in the security
bulletin until a software update is available.

The security bulletin with detailed workaround can be found at:

https://techsupport.osisoft.com/Troubleshooting/Alerts/AL00312

NCCIC/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.

In addition, ICS-CERT recommends that users take the following measures
to protect themselves from social engineering attacks:

    Do not click web links or open unsolicited attachments in email messages.
    Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
    Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target this vulnerability. Not
remotely exploitable. Low skill level is needed to exploit.

VULNERABILITY OVERVIEW

INFORMATION EXPOSURE THROUGH SERVER LOG FILES CWE-533

An information exposure through server log files vulnerability has been
identified, which may allow service account passwords to become exposed
for the affected services, potentially leading to unauthorized shutdown
of the affected PI services as well as potential reuse of domain credentials.

CVE-2017-5153 has been assigned to this vulnerability. A CVSS v3
base score of 6.1 has been assigned; the CVSS vector string is
(AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H).

RESEARCHER

Vint Maggs from Savannah River Nuclear Solutions reported this issue
to OSIsoft.

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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        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
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The University of Queensland
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Internet Email: auscert@auscert.org.au
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