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AUSCERT External Security Bulletin Redistribution
ESB-2017.0380
Sielco Sistemi Winlog SCADA Software
9 February 2017
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AusCERT Security Bulletin Summary
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Product: Sielco Sistemi Winlog
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-5161
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-038-01
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Advisory (ICSA-17-038-01)
Sielco Sistemi Winlog SCADA Software
Original release date: February 07, 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/.
CVSS v3 7.2
Vendor: Sielco Sistemi
Equipment: Winlog SCADA Software
Vulnerability: Uncontrolled Search Path Element
AFFECTED PRODUCTS
The following Sielco Sistemi products are affected:
Winlog Lite SCADA Software, versions prior to Version 3.02.01, and
Winlog Pro SCADA Software, versions prior to Version 3.02.01
IMPACT
Successful exploitation of this vulnerability may allow an attacker to load a
malicious DLL and execute code on the affected system with the same privileges
as the application that loaded the malicious DLL.
MITIGATION
Sielco Sistemi has released new versions of the Winlog Lite and Winlog Pro
SCADA software that mitigate the uncontrolled search path element
vulnerability.
The most current versions of Winlog Lite and Winlog Pro SCADA software are
available here:
https://www.sielcosistemi.com/en/download/public/download.html (link is
external)
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 ICSCERT 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:
1.Do not click web links or open unsolicited attachments in email messages.
2.Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
3.Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target this vulnerability. This
vulnerability is not remotely exploitable. High skill level is needed to
exploit.
VULNERABILITY OVERVIEW
UNCONTROLLED SEARCH PATH ELEMENT (CWE-427)
An uncontrolled search path element (DLL Hijacking) vulnerability has been
identified. Exploitation of this vulnerability could give an attacker access
to the system with the same level of privilege as the application that
utilizes the malicious DLL.
CVE-2017-5161 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is
(AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H).
RESEARCHER
Researcher Karn Ganeshen identified this vulnerability.
BACKGROUND
Critical Infrastructure Sectors: Communications, Critical Manufacturing,
Energy, Water and Wastewater
Countries Deployed: Deployed worldwide
Company Headquarters Location: Italy
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