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AUSCERT External Security Bulletin Redistribution
ESB-2021.1839
Advisory (icsa-21-147-03) MesaLabs AmegaView
28 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: AmegaView
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27453 CVE-2021-27451 CVE-2021-27449
CVE-2021-27447 CVE-2021-27445
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-147-03
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ICS Advisory (ICSA-21-147-03)
MesaLabs AmegaView
Original release date: May 27, 2021
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 10.0
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Mesa Labs
o Equipment: AmegaView
o Vulnerabilities: Command Injection, Improper Authentication, Authentication
Bypass Using an Alternate Path or Channel, Improper Privilege Management
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow remote code
execution or allow access to the device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of AmegaView, a continuous monitoring hardware and
software platform, are affected:
o AmegaView Versions 3.0 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
INJECTION') CWE-77
The affected product is vulnerable to a command injection, which may allow an
attacker to remotely execute arbitrary code.
CVE-2021-27447 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/
C:H/I:H/A:H ).
3.2.2 IMPROPER AUTHENTICATION CWE-287
The affected product's passcode is generated by an easily reversible algorithm,
which may allow an attacker to gain access to the device.
CVE-2021-27451 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L ).
3.2.3 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
The affected product uses default cookies that could be set to bypass
authentication to the web application, which may allow an attacker to gain
access.
CVE-2021-27453 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L ).
3.2.4 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
INJECTION') CWE-77
The affected product has a command injection vulnerability that can be
exploited to execute commands in the web server.
CVE-2021-27449 has been assigned to this vulnerability. A CVSS v3 base score of
9.9 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:H/A:H ).
3.2.5 IMPROPER PRIVILEGE MANAGEMENT CWE-269
The affected product has insecure file permissions that could be exploited to
escalate privileges on the device.
CVE-2021-27445 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health, Food and
Agriculture
o COUNTRIES/AREAS DEPLOYED: United States
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Stephen Yackey of Securifera reported these vulnerabilities to CISA.
4. MITIGATIONS
MesaLabs has scheduled AmegaView for end-of-life at the end of 2021. Due to
this discontinued service, MesaLabs does not plan to release an update to
address these vulnerabilities. MesaLabs recommends users upgrade to the newer
ViewPoint software that is compatible with AmegaView hardware.
CISA 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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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 practices
on the ICS webpage on us-cert.cisa.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.cisa.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.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA 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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