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AUSCERT External Security Bulletin Redistribution
ESB-2017.0261
Eaton ePDU Path Traversal Vulnerability
30 January 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Eaton ePDU
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2016-9357
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-026-01
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Advisory (ICSA-17-026-01)
Eaton ePDU Path Traversal Vulnerability
Original release date: January 26, 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
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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 Maxim Rupp has identified a path traversal
vulnerability in certain legacy Eaton ePDUs. Although the affected products
are past end-of-life (EoL) and is no longer supported, Eaton has provided
defense-in-depth mitigation instructions to protect devices that are still in
use.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Eaton reports that the vulnerability affects the following products:
EAMxxx prior to June 30, 2015,
EMAxxx prior to January 31, 2014,
EAMAxx prior to January 31, 2014,
EMAAxx prior to January 31, 2014, and
ESWAxx prior to January 31, 2014.
IMPACT
An unauthenticated attacker may be able to exploit this vulnerability to
access configuration files.
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
Eaton is a US-based company that maintains offices worldwide.
The affected products, ePDUs, are rack-mounted power distribution units.
According to Eaton, ePDUs are deployed across several sectors including
Commercial Facilities, Critical Manufacturing, Energy, Water and Wastewater
Systems, and others. Eaton estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
PATH TRAVERSAL[a]
An unauthenticated attacker may be able to access configuration files with a
specially crafted URL.
CVE-2016-9357[b] 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).[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 level would be able to exploit this
vulnerability.
MITIGATION
Eaton declared these products EoL on January 31, 2014, and June 30, 2015.
Eaton recommends that users of the affected legacy products follow the
recommendations outlined in the Defense in depth section of Eatons whitepaper
titled Cybersecurity considerations for electrical distribution systems. It is
located at:
http://www.eaton.com/ecm/groups/public/@pub/@eaton/@corp/documents/content/pct_1603172.pdf
(link is external)
Additional information regarding these and other legacy products can be found
on the Eaton web site at the following location:
http://powerquality.eaton.com/EMEA/Products-services/Legacy/Legacy-Products.asp
(link is external)
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.
[a.] CWE-22: Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal') , https://cwe.mitre.org/data/definitions/22.html,
web site last accessed January 26, 2017.
[b.] NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9357
, 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:N/S..., web site last accessed
January 26, 2017
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