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AUSCERT External Security Bulletin Redistribution
ESB-2016.0976
Sierra Wireless ACEmanager Information Exposure Vulnerability
18 April 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Sierra Wireless ACEmanager
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-6479
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-105-01
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Advisory (ICSA-16-105-01)
Sierra Wireless ACEmanager Information Exposure Vulnerability
Original release date: April 14, 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 Maxim Rupp has identified an exposure of
sensitive information vulnerability in the Sierra Wireless ACEmanager
application. Sierra Wireless has produced a new version to mitigate this
vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following Sierra Wireless versions are affected:
LS300 running ALEOS 4.4.2 and earlier,
GX400 running ALEOS 4.4.2 and earlier,
GX440 running ALEOS 4.4.2 and earlier,
ES440 running ALEOS 4.4.2 and earlier,
GX450 running ALEOS 4.4.2 and earlier, and
ES450 running ALEOS 4.4.2 and earlier.
IMPACT
Sierra Wireless has outlined the threat associated with attackers having
access to the filteredlogs.txt file. Because of the diagnostic nature of
such files, an attacker may be able to learn operational characteristics
of the gateway, e.g., the sequence of operations at boot time.
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
Sierra Wireless is a Canadian-based company that maintains offices in several
countries around the world, including the United States, France, and China.
The affected product, Sierra Wireless ACEmanager, is a gateway that provides
connectivity to industrial, enterprise, and transportation organizations
around the world. According to Sierra Wireless, ACEmanager is deployed across
several sectors including Commercial Facilities, Critical Manufacturing,
Energy, Water and Wastewater Systems, and others. Sierra Wireless estimates
that these products are used primarily in Canada, the United States,
and Europe.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
FILE AND DIRECTORY INFORMATION EXPOSURE[a]
The file filteredlogs.txt is available without authorization. No
sensitive information is written to the accessible log file, although
because of the diagnostic nature of such files an attacker may be able
to learn operational characteristics of the device, e.g., the sequence of
operations at boot time. The accessible log file only persists until the
next log view operation or until the device reboots.
CVE-2016-6479[b] has been assigned to this vulnerability. A CVSS
v3 base score of 4.3 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/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 would be able to exploit this vulnerability.
MITIGATION
Sierra Wireless has produced a new version to mitigate this
vulnerability. This update can be downloaded at:
http://source.sierrawireless.com/resources/airlink/software_downloads/updating-form-older-version-aleos/
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 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.
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
(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-538: File and Directory Information Exposure,
http://cwe.mitre.org/data/definitions/538.html, web site last accessed
April 14, 2016.
b.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-6479 ,
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 April 14, 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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