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AUSCERT External Security Bulletin Redistribution
ESB-2014.2041
Accuenergy Acuvim II Authentication Vulnerabilities
4 November 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: Accuenergy Acuvim II
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-2374 CVE-2014-2373
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-14-275-02
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Advisory (ICSA-14-275-02)
Accuenergy Acuvim II Authentication Vulnerabilities
Original release date: October 30, 2014
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
This advisory was originally posted to the US-CERT secure Portal library on
October 2, 2014, and is being released to the ICS-CERT web site.
Independent researcher Laisvis Lingvevicius has identified two authentication
vulnerabilities within the Accuenergy AXM-NET Ethernet modules web server. The
AXM-NET Ethernet module is an accessory for the Acuvim II. Accuenergy has
produced a firmware upgrade that mitigates these vulnerabilities. The
researcher has tested the firmware to validate that it resolves the
vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following Accuenergy Acuvim II accessory is affected:
AXN-NET Ethernet module v.3.04
IMPACT
The authentication bypass vulnerability allows access to the settings on the
Ethernet module web server interface without authenticating. The password
bypass vulnerability allows an attacker to display passwords using JavaScript.
A malicious user could create a denial of service for the web server by
changing the network settings.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of these vulnerabilities based on their operational environment, architecture,
and product implementation.
BACKGROUND
Accuenergy is a Canada-based company that maintains offices in several
countries around the world, including the United States, Canada, and China.
The affected product, Acuvim II, is a multifunction power metering device. The
AXM-NET Ethernet module creates a web page to display data produced by the
Acuvim II. According to Accuenergy, Acuvim II is deployed in the Energy
sector. Accuenergy estimates that this product is used primarily in North
America and China.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS [b]
By accessing a specific uniform resource locator (URL) on the web server, a
malicious user is able to access settings without authenticating. Accessible
settings are limited, and include the network settings for the AXM-NET module
web server, but not the Acuvim II device.
CVE-2014-2373 [c] has been assigned to this vulnerability. A CVSS v2 base score
of 7.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:N/C:P/I:P/A:P).[d]
PASSWORD DISCLOSURE [e]
The Acuvim II uses JavaScript to validate passwords leaving it vulnerable to a
JavaScript attack that displays passwords. Authenticated users could change
the network settings of the AXM-NET module web server, but do not have access
to the Acuvim II device.
CVE-2014-2374 [f] has been assigned to this vulnerability. A CVSS v2 base score
of 7.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:N/C:P/I:P/A:P). [g]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
Accuenergy has produced a patch to mitigate these vulnerabilities. The patch
can be downloaded at the following location:
http://www.accuenergy.com/firmware-update-axm-net
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-12-146-01BTargeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site
(www.ics-cert.org).
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.
In addition, ICS-CERT recommends that users take the following measures to
protect themselves from social engineering attacks:
1. Do not click web links or open unsolicited attachments in email messages.
2. Refer to Recognizing and Avoiding Email Scams [h] for more information on
avoiding email scams.
3. Refer to Avoiding Social Engineering and Phishing Attacks [i] for more
information on social engineering attacks.
b. CWE-592: Authentication Bypass Issues,
http://cwe.mitre.org/data/definitions/592.html, web site last accessed October
30, 2014.
c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2373,
NIST uses this advisory to create the CVE web site report.
d. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:P/I:P/A:P, web
site last accessed October 30, 2014.
e. CWE-602: Client-Side Enforcement of Server-Side Security,
http://cwe.mitre.org/data/definitions/602.html, web site last accessed October
30, 2014.
f. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2374,
NIST uses this advisory to create the CVE web site report.
g. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:P/I:P/A:P, web
site last accessed October 30, 2014.
h. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed October 30, 2014.
i. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed October
30, 2014.
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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This security bulletin is provided as a service to AusCERT's members. As
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The University of Queensland
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Internet Email: auscert@auscert.org.au
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