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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-19-122-03) Sierra Wireless AirLink ALEOS
3 May 2019
AusCERT Security Bulletin Summary
Product: Sierra Wireless AirLink ALEOS
Publisher: ational Cybersecurity and Communications Integration Center
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Cross-site Request Forgery -- Remote with User Interaction
Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2018-4069 CVE-2018-4067 CVE-2018-4066
CVE-2018-4065 CVE-2018-4063 CVE-2018-4062
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Sierra Wireless AirLink ALEOS
Original release date: May 02, 2019
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provided"as is" for informational purposes only. The Department of Homeland
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For more information about TLP, see http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.1
o ATTENTION: Exploitable remotely/low skill level to exploit/public exploits
o Vendor: Sierra Wireless
o Equipment: AirLink ALEOS
o Vulnerabilities: OS Command Injection, Use of Hard-coded Credentials,
Unrestricted Upload of File with Dangerous Type, Cross-site Scripting,
Cross-site Request Forgery, Information Exposure, Missing Encryption of
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow attackers to
remotely execute code, discover user credentials, upload files, or discover
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Sierra Wireless reports the vulnerabilities affect the following AirLink ALEOS
versions and products:
o LS300, GX400, GX440, and ES440: Version 4.4.8 and prior
o GX450 and ES450: All versions prior to 4.9.4
o MP70, MP70E, RV50, RV50X, LX40, and LX60: All versions prior to 4.12
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
A specially crafted authenticated HTTP request can inject arbitrary commands,
resulting in remote code execution.
CVE-2018-4061 has been assigned to this vulnerability. A CVSS v3 base score of
9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/
3.2.2 USE OF HARD-CODED CREDENTIALS CWE-798
Activating SNMPD outside of the WebUI can cause the activation of the
hard-coded credentials, resulting in the exposure of a privileged user. An
attacker can activate SNMPD without any configuration changes to trigger this
CVE-2018-4062 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:H/UI:N/S:U/
3.2.3 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434
A specially crafted authenticated HTTP request can upload a file, resulting in
an executable, routable code upload to the web server.
CVE-2018-4063 has been assigned to this vulnerability. A CVSS v3 base score of
9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/
3.2.4 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
executed and run on the user's browser. An attacker can exploit this by
convincing a user to click a link or embedded URL that redirects to the
reflected cross-site scripting vulnerability.
CVE-2018-4065 has been assigned to this vulnerability. A CVSS v3 base score of
6.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
3.2.5 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
A specially crafted HTTP request can cause an authenticated user to perform
privileged requests unknowingly, resulting in unauthenticated requests through
an authenticated user. Triggering this vulnerability may allow an attacker
access to authenticated pages via an authenticated user.
CVE-2018-4066 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
3.2.6 INFORMATION EXPOSURE CWE-200
A specially crafted authenticated HTTP request can cause an information leak,
resulting in the disclosure of internal file paths.
CVE-2018-4067 has been assigned to this vulnerability. A CVSS v3 base score of
4.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/
3.2.7 MISSING ENCRYPTION OF SENSITIVE DATA CWE-311
The ACEManager authentication functionality is delivered in plaintext XML to
the web server. An attacker can listen to network traffic upstream from the
device, which may allow access to credentials.
CVE-2018-4069 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Communications,
Emergency Services, Energy, Government Facilities, Transportation Systems,
Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
Carl Hurd and Jared Rittle of Cisco Talos reported these vulnerabilities to
Sierra Wireless recommends users upgrade to the latest version of ALEOS for the
products and versions below (Some updates are not yet available). For upgrade
assistance contact an authorized AirLink reseller, Sierra Wireless sales,
technical representative, or Sierra Wireless technical support.
o LS300, GX400, GX440, ES440: ALEOS 4.4.9 (Available by the end of 2019)
o GX450, ES450ALEOS 4.9.4.p09 (Currently available)
o MP70, MP70E, RV50, RV50X, LX40, LX60: ALEOS 4.12 (Available by the end of
Sierra Wireless recommends users follow the actions outlined below:
o Ensure a strong password is set for the user account. For guidance on
password strength, Sierra Wireless recommends the "memorized secret
authenticator" guidelines in NIST SP800-63B.
o If ALEOS Application Framework (AAF) is enabled, ensure a strong password
is set for the AAF User account.
o If Telnet or SSH is enabled, ensure a strong password is set for the
o When connecting directly to ACEmanager:
Use only HTTPS.
Utilize an up-to-date, modern web browser with built-in CSS and CSRF
protection, such as Chrome, Firefox, or Edge.
For more information, see the Sierra Wireless security advisory using the
The following SNORT rules will detect exploitation attempts. Note that
additional rules may be released at a future date and current rules are subject
to change pending additional vulnerability information. For the most current
rule information, please refer to a Firepower Management Center or Snort.org.
Snort Rules: 48600, 48635, 48614 - 48621, 48747
NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC 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
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.
NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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