ICS Advisory (ICSA-21-147-03)

MesaLabs AmegaView

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1. EXECUTIVE SUMMARY

  • CVSS v3 10.0
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Mesa Labs
  • Equipment: AmegaView
  • 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:

  • 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

  • CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health, Food and Agriculture
  • COUNTRIES/AREAS DEPLOYED: United States
  • 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:

  • 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 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.


Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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