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AUSCERT External Security Bulletin Redistribution
ESB-2013.1537
WellinTech KingView ActiveX Vulnerabilities
28 October 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: WellinTech KingView
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Overwrite Arbitrary Files -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-6128 CVE-2013-6127
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-13-295-01
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Advisory (ICSA-13-295-01)
WellinTech KingView ActiveX Vulnerabilities
Original release date: October 22, 2013
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/.
OVERVIEW
This advisory is a follow-up to the alert titled ICS-ALERT-13-256-01 WellinTech
KingView ActiveX Vulnerabilities[a] that was published September 13, 2013, on
the NCCIC/ICS-CERT Web site.
Independent researcher "Blake" identified ActiveX vulnerabilities and released
proof-of-concept (exploit) code for WellinTech KingView application without
coordination with NCCIC/ICS-CERT, the vendor, or any other coordinating entity
known to NCCIC/ICS-CERT. WellinTech has produced a new version that mitigates
these vulnerabilities.
These vulnerabilities could be exploited remotely. Exploits that target these
vulnerabilities are known to be publicly available.
AFFECTED PRODUCTS
The following KingView versions are affected:
KingView versions older than Version 6.53.
IMPACT
Successful exploitation of these vulnerabilities may allow an attacker to
overwrite files and copy them from one location to another on the target
machine.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.
BACKGROUND
WellinTech is a software development company specializing in automation and
control. WellinTech is based in Beijing, China, with branches in the United
States, Japan, Singapore, Europe, and Taiwan.
According to the WellinTech Web site, the KingView product is a Windows-based
control, monitoring, and data collection application deployed across several
industries including power, water, building automation, mining, and others.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
INSECURE ACTIVEX CONTROL[b]
WellinTech KingView contains a flaw in the SuperGrid.ocx ActiveX control that
allows an attacker to traverse outside a restricted path. The issue is due to
the program not properly sanitizing user input, specifically directory
traversal style attacks.
This proof of concept will copy any arbitrary file from one location to a
second location. It can also be used to overwrite existing files. This
vulnerability may be used to inject files which, in turn, may allow arbitrary
code execution.
CVE-2013-6127[c] has been assigned to this vulnerability. A CVSS v2 base score
of 5.8 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:N/I:P/A:P).[d]
ACTIVEX REMOTE FILE CREATION/OVERWRITE[e]
WellinTech KingView contains a flaw in the KChartXY.ocx ActiveX control that
allows an attacker to traverse outside a restricted path. The issue is due to
the program not properly sanitizing user input.
Proof of concept overwrites the win.ini file.
CVE-2013-6128[f] has been assigned to this vulnerability. A CVSS v2 base score
of 5.8 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:N/I:P/A:P).[g]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
Exploits that target these vulnerabilities are publicly available.
DIFFICULTY
An attacker with a medium skill would be able to exploit these vulnerabilities.
MITIGATION
WellinTech has provided the following links to download new versions of the
affected files:
SuperGrid.ocx Version number:65.30.30000.10002
http://www.kingview.com/en/downloads/Downloads/SuperGrid.rar
KChartXY.ocx Version number:65.30.30000.10002
http://www.kingview.com/en/downloads/Downloads/KChartXY.rar
It is also possible to correct the flaw by implementing the following
workarounds:
Set the kill-bit on the KChartXY ActiveX Control
(CLSID A9A2011A-1E02-4242-AAE0-B239A6F88BAC).
Set the kill-bit on the SuperGrid ActiveX Control
(CLSID F494550F-A028-4817-A7B5-E5F2DCB4A47E).
For specific information on mitigating ActiveX vulnerabilities, see Microsoft
KB article 240797.[h]
NCCIC/ICS-CERT encourages asset owners to take additional defensive measures to
protect against this and other cybersecurity risks.
Minimize network exposure for all control system devices. Critical devices
should not directly face 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 VPN is only as secure as the connected
devices.
NCCIC/ICS-CERT also provides a section for control systems security
recommended practices on the NCCIC/ICS-CERT Web page. Several recommended
practices are available for reading and download, including Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.[i]
NCCIC/ICS-CERT reminds organizations to perform proper impact analysis and
risk assessment prior to taking defensive measures.
Additional mitigation guidance and recommended practices are publicly available
in the NCCIC/ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B-Targeted
Cyber Intrusion Mitigation Strategies,[j] that is available for download from
the NCCIC/ICS-CERT Web page (http://ics-cert.us-cert.gov/).
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC/ICS-CERT for
tracking and correlation against other incidents.
a. ICS-ALERT-13-256-01 WellinTech KingView ActiveX Vulnerabilities,
http://ics-cert.us-cert.gov/alerts/ICS-ALERT-13-256-01,
Web site last accessed October 22, 2013.
b. CWE-40: Path Traversal: '\\UNC\share\name\' (Windows UNC Share),
http://cwe.mitre.org/data/definitions/40.html, Web site last accessed
October 22, 2013.
c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6127,
NIST uses this advisory to create the CVE Web site report. This Web site
will be active sometime after publication of this advisory.
d. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:P/A:P,
Web site last visited October 22, 2013.
e. CWE-28: Path Traversal: '..\filedir',
http://cwe.mitre.org/data/definitions/28.html,
Web site last accessed October 22, 2013.
f. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6128,
NIST uses this advisory to create the CVE Web site report. This Web site
will be active sometime after publication of this advisory.
g. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:P/A:P,
Web site last visited October 22, 2013.
h. Microsoft Support article: How to stop an ActiveX control from running in
Internet Explorer, http://support.microsoft.com/kb/240797, Web site last
accessed October 22, 2013.
i. CSSP Recommended Practices,
http://ics-cert.us-cert.gov/content/recommended-practices, Web site last
accessed October 22, 2013.
j. Targeted Cyber Intrusion Detection and Mitigation Strategies,
http://ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B, Web site last
accessed October 22, 2013.
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 answering a short series of questions about this product at the
following URL: https://forms.us-cert.gov/ncsd-feedback/.
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