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AUSCERT External Security Bulletin Redistribution
ESB-2019.1530.2
Advisory (ICSA-19-122-03) Sierra Wireless AirLink ALEOS
27 April 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Sierra Wireless AirLink ALEOS
Publisher: National 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
Resolution: Patch/Upgrade
CVE Names: CVE-2018-4069 CVE-2018-4067 CVE-2018-4066
CVE-2018-4065 CVE-2018-4063 CVE-2018-4062
CVE-2018-4061
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-19-122-03
Revision History: April 27 2020: Affected and and Updated version details released
May 3 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-19-122-03)
Sierra Wireless AirLink ALEOS (Update B)
Original release date: April 23, 2020
Legal Notice
All information products included in https://us-cert.gov/ics 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 https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.1
o ATTENTION: Exploitable remotely/low skill level to exploit/public exploits
are available
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
Sensitive Data
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-19-122-03 Sierra Wireless AirLink ALEOS (Update A) that was published
August 20, 2019, on the ICS webpage on us-cert.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow attackers to
remotely execute code, discover user credentials, upload files, or discover
file paths.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
Sierra Wireless reports the vulnerabilities affect the following AirLink ALEOS
versions and products:
- --------- Begin Update B Part 1 of 2 ---------
o LS300, GX400, GX440, and ES440: All versions prior to 4.4.9
- --------- End Update B Part 1 of 2 ---------
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
4.2 VULNERABILITY OVERVIEW
4.2.1 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/
C:H/I:H/A:H ).
4.2.2 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
vulnerability.
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/
C:H/I:L/A:H ).
4.2.3 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/
C:H/I:H/A:H ).
4.2.4 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
A specially crafted HTTP ping request can cause reflected JavaScript to be
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/
C:L/I:L/A:N ).
4.2.5 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/
C:N/I:H/A:H ).
4.2.6 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/
C:L/I:N/A:N ).
4.2.7 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/
C:H/I:N/A:N ).
4.3 BACKGROUND
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
4.4 RESEARCHER
Carl Hurd and Jared Rittle of Cisco Talos reported these vulnerabilities to
Sierra Wireless.
5. MITIGATIONS
- --------- Begin Update B Part 2 of 2 ---------
Sierra Wireless recommends users upgrade to the latest version of ALEOS for the
products and versions below. 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
The ALEOS 4.4.9 Release Note is available (login required)
o GX450, ES450: ALEOS 4.9.4.p09
o MP70, MP70E, RV50, RV50X, LX40, LX60: ALEOS 4.12
The ALEOS 4.12.0 Release Note is available (login required)
- --------- End Update B Part 2 of 2 ---------
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
console account.
When connecting directly to ACEmanager:
o Use only HTTPS.
o 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 .
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
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practice
s on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
CISA also recommends 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.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
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