CVE-2021-43362 in HBYS
Summary
by MITRE • 11/17/2021
Due to improper sanitization MedData HBYS software suffers from a remote SQL injection vulnerability. An unauthenticated attacker with the web access is able to extract critical information from the system.
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Analysis
by VulDB Data Team • 11/21/2021
The CVE-2021-43362 vulnerability represents a critical remote SQL injection flaw in MedData HBYS software that stems from inadequate input sanitization mechanisms within the application's web interface. This vulnerability classifies under CWE-89 which specifically addresses SQL injection weaknesses where insufficient validation of user-supplied data allows malicious actors to manipulate database queries. The flaw exists in the software's handling of web-based inputs that are directly incorporated into SQL command strings without proper parameterization or escaping mechanisms, creating an exploitable attack surface for remote adversaries.
The technical exploitation of this vulnerability enables unauthenticated attackers to execute arbitrary SQL commands against the underlying database system through web access points. This occurs when user-controllable parameters are improperly processed and concatenated directly into SQL queries, allowing attackers to inject malicious SQL syntax that can bypass authentication mechanisms, extract sensitive data, modify database contents, or even execute system commands depending on the database management system in use. The vulnerability affects the software's web interface components that handle user inputs, making it accessible to anyone with network access to the web application without requiring prior authentication credentials.
The operational impact of CVE-2021-43362 extends beyond simple data exfiltration to potentially compromise entire database infrastructures and expose sensitive medical information. Given that MedData HBYS software is typically used in healthcare environments, successful exploitation could lead to unauthorized access to patient records, medical histories, personal health information, and other confidential data that would violate healthcare privacy regulations such as HIPAA. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet without requiring physical access to the network, significantly expanding the potential attack surface and threat landscape.
Organizations utilizing MedData HBYS software should implement immediate mitigations including applying vendor-provided patches, implementing web application firewalls to detect and block SQL injection attempts, and conducting comprehensive input validation across all web-facing components. Network segmentation and access controls should be strengthened to limit exposure, while database access should be restricted to only necessary applications and users with least privilege principles. The vulnerability aligns with ATT&CK technique T1190 which describes exploiting vulnerabilities in web applications, and T1071.004 which covers application layer protocols including web protocols that can be leveraged for data extraction. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the healthcare information system infrastructure.