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AUSCERT External Security Bulletin Redistribution
ESB-2015.0353
Advantech EKI-1200 Buffer Overflow
12 February 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Advantech EKI-1200 products
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-8385
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-041-01
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Advisory (ICSA-15-041-01)
Advantech EKI-1200 Buffer Overflow
Original release date: February 10, 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
Enrique Nissim and Pablo Lorenzzato from Core Security Engineering Team have
identified a buffer overflow vulnerability in Advantech EKI-1200 product line.
Advantech has produced a patch that mitigates this vulnerability. CORE
Security has tested the patch to validate that it resolves the vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Advantech reports that the vulnerability affects the following products:
EKI-1200 product line.
IMPACT
An exploit of this vulnerability could allow an attacker to execute arbitrary
code.
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
Advantech is based in Taiwan and has distribution offices in 21 countries
worldwide.
The EKI-1200 series Modbus gateways are bi-directional gateways for
integrating Modbus/RTU and Modbus/ASCII serial devices to TCP/IP
networked-based devices. These products are deployed in industrial automation
globally.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
BUFFER OVERFLOW [a]
Advantech EKI-1200 products are vulnerable to a buffer overflow, which can be
exploited by remote attackers to execute arbitrary code.
CVE-2014-8385 [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
Advantech has created new firmware Version 1.63 to mitigate this
vulnerability. Users may download the patch from the following location at
Advantechs web site:
http://support.advantech.com.tw/Support/DownloadSRDetail_New.aspx?SR_ID=1-V6XOHK&Doc_Source=Download
For additional information about the EKI 1221, please visit the following
Advantech web site:
http://www.advantech.com/products/INDUSTRIAL_COMMUNICATION/EKI-1221/mod_A4DB49EB-38F0-4745-A83C-B0EAC73AC0B3.aspx
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/).
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-122: Heap-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/122.html, web site last accessed
February 10, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8385,
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 February 10, 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
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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