CISA Advisory: MegaSys Computer Technologies Telenium Online Web Application

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1. EXECUTIVE SUMMARY

• CVSS v4 9.3
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: MegaSys Computer Technologies
• Equipment: Telenium Online Web Application
• Vulnerability: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to inject arbitrary Perl code through a crafted HTTP request, leading to remote code execution on the server.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following MegaSys Computer Technologies products are affected:

• Telenium Online Web Application: versions 8.3 and prior

3.2 Vulnerability Overview

3.2.1 IMPROPER INPUT VALIDATION CWE-20

Telenium Online Web Application is vulnerable due to a Perl script that is called to load the login page. Due to improper input validation, an attacker can inject arbitrary Perl code through a crafted HTTP request, leading to remote code execution on the server.

CVE-2024-6404 has been assigned to this vulnerability. A CVSS v3.1 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-6404. A base score of 9.3 has been calculated; the CVSS vector string is (CVSS4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Information Technology, Communications
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Canada

3.4 RESEARCHER

Blake Rash and Bryan Sears reported this vulnerability to CISA.

4. MITIGATIONS

MegaSys Computer technologies released the following patches:

• Telenium Online Web Application: v7.4.72
• Telenium Online Web Application: v8.3.36

If users are unable to promptly install the patched versions that address the vulnerability, MegaSys Computer Technologies recommends mitigating the risk by disabling the web/browser-based interface.

For additional information or assistance, contact Megasys Computer Technologies support directly.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more 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 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 practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• September 19, 2024: Initial Publication