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AUSCERT External Security Bulletin Redistribution
ESB-2016.2980
Visonic PowerLink2 Vulnerabilities
15 December 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Visonic PowerLink2
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5813 CVE-2016-5811
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-348-01
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Advisory (ICSA-16-348-01)
Visonic PowerLink2 Vulnerabilities
Original release date: December 13, 2016
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/.
OVERVIEW
Independent researcher Aditya K. Sood has identified cross-site scripting
and source code disclosure vulnerabilities in Visonic's PowerLink2
module. Visonic has produced an updated version to mitigate these
vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following PowerLink2 versions are affected:
PowerLink2, all versions prior to October 2016 firmware release.
IMPACT
Successful exploitation of these vulnerabilities allows the attacker
to gather information on how server side images are generated. Careful
analysis combined with some additional information (from testing the
product), allows the attacker to download images from the server.
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
Visonic is an Israel-based company and subsidiary of Tyco, that maintains
offices in several countries around the world, including the US, UK,
Denmark, Poland, Spain, Germany, Singapore, China, and Australia.
The affected product, PowerLink2, provides web interface to view and control
an intrusion security system. According to Visonic, PowerLink2 modules are
deployed in the Commercial Facilities sector. Visonic estimates that this
product is used primarily in the United States and Europe with a small
percentage in Asia.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
CROSS-SITE SCRIPTING[a]
User controlled input is not neutralized prior to being placed in web
page output.
CVE-2016-5811[b] has been assigned to this vulnerability. A CVSS
v3 base score of 6.1 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).[c]
INFORMATION EXPOSURE[d]
When a specific URL to an image is accessed, the downloaded image carries
with it source code used in the web server.
CVE-2016-5813[e] has been assigned to this vulnerability. A CVSS
v3 base score of 5.3 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).[f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with low skill would be able to exploit these vulnerabilities.
MITIGATION
Visonic recommends affected users employ the following mitigations:
For products that are EOL (end of life), contact the alarm service
provider to replace/upgrade the unit to PowerLink3.
For products still under production, request that the alarm service
provider remotely update the unit with the new firmware version released
October 2016.
ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. 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.
a.
CWE-79: Improper Neutralization of Input During Web Page Generation
('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html,
web site last accessed December 13, 2016.
b.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5811,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
c.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S...,
web site last accessed December 13, 2016.
d.
CWE-200: Information Exposure,
http://cwe.mitre.org/data/definitions/200.html, web site last accessed
December 13, 2016.
e.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5813,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
f.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed December 13, 2016.
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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