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1. EXECUTIVE SUMMARY

CVSS v3 6.5
ATTENTION: Exploitable remotely/low attack complexity/public exploits are available/known public exploitation
Vendor: Suprema Inc.
Equipment: BioStar 2
Vulnerability: SQL Injection

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to perform a SQL injection to execute arbitrary commands.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Suprema BioStar 2, an access control system, are affected:

BioStar 2: version 2.8.16

3.2 Vulnerability Overview

3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND (‘SQL INJECTION’) CWE-89

Suprema BioStar 2 v2.8.16 was discovered to contain a SQL injection vulnerability via value parameters.

CVE-2023-27167 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Multiple
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: South Korea

3.4 RESEARCHER

CISA discovered a public proof of concept (PoC) as authored by Yuriy (Vander) Tsarenko and reported it to Exploit-db.

4. MITIGATIONS

SupremaINC has released BioStar 2 2.9.4 to fix this vulnerability.

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.

5. UPDATE HISTORY

September 26, 2023: Initial Publication