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AUSCERT External Security Bulletin Redistribution
ESB-2015.0672
Honeywell XL Web Controller Directory Traversal Vulnerability
19 March 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Honeywell XL Web Controller
Publisher: US-CERT
Operating System: Linux variants
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0984
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-076-02
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Advisory (ICSA-15-076-02)
Honeywell XL Web Controller Directory Traversal Vulnerability
Original release date: March 17, 2015
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
Martin Jartelius of Outpost24 has identified a directory traversal
vulnerability in Honeywells XL Web Controller. Honeywell has produced an
update that mitigates this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following XLWeb controller versions are affected:
XL1000C50 EXCEL WEB 52 I/O,
XL1000C100 EXCEL WEB 104 I/O,
XL1000C500 EXCEL WEB 300 I/O,
XL1000C1000 EXCEL WEB 600 I/O,
XL1000C50U EXCEL WEB 52 I/O UUKL,
XL1000C100U EXCEL WEB 104 I/O UUKL,
XL1000C500U EXCEL WEB 300 I/O UUKL, and
XL1000C1000U EXCEL WEB 600 I/O UUKL.
IMPACT
An attacker may use this vulnerability to generate a valid login for an
administrative user on the Honeywell XLWeb controller giving the attacker full
administrator access to the system. The XLWEB application effectively becomes
an entry point into the network where it is located.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of this vulnerability based on their operational environment,
architecture, and product implementation.
BACKGROUND
Honeywell is a US-based company that maintains offices worldwide.
The affected products, XLWeb controllers, are web-based SCADA systems.
According to Honeywell, XLWeb controllers are deployed across several sectors
including Critical Manufacturing, Energy, Water and Wastewater Systems, and
others. Honeywell estimates that these products are used primarily in Europe
and the Middle East.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
PATH TRAVERSAL[a]
By using a directory traversal vulnerability in the FTP server, it is possible
to gain access to the web root directory.
CVE-2015-0984[b] has been assigned to this vulnerability. A CVSS v2 base score
of 10.0 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:N/C:C/I:C/A:C).[c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
The update for this vulnerability is Excel Web Linux version 2.04.01 (March,
2014) or later plus the programing tool CARE version 10.02 (March 2014) or
later. Customers are encouraged to contact their local Honeywell HBS branch to
have their sites updated to the latest version.
In the Centraline partner channel, Excel Web controllers also have been sold
under the brand name FALCON. Centraline partners can directly access
http://www.centraline.com and get these versions.
Linux:
https://www.centraline.com/index.php?id=847&route=article/index&directory_id=140&direct_link=1
CARE:
https://www.centraline.com/index.php?id=847&route=article/index&directory_id=138&direct_link=1
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 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 also provides a section for control systems security recommended
practices on the ICS-CERT web page at:
http://ics-cert.us-cert.gov/content/recommended-practices. Several recommended
practices are available for reading and download, including Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
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
(http://ics-cert.us-cert.gov/).
a. CWE-22: Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal'), http://cwe.mitre.org/data/definitions/22.html, web site
last accessed March 17, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0984,
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,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web
site last accessed March 17, 2015.
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
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