CVE-2021-41843 : Security Advisory and Response
Learn about CVE-2021-41843, an authenticated SQL injection flaw in OpenEMR 6.0.0, allowing attackers to read data from all database tables. Discover mitigation steps and preventive measures.
OpenEMR 6.0.0 before patch 3 has an authenticated SQL injection vulnerability in the calendar search function, allowing unauthorized access to all database tables.
Understanding CVE-2021-41843
An overview of the SQL injection vulnerability in OpenEMR.
What is CVE-2021-41843?
The CVE-2021-41843 vulnerability allows attackers to extract data from all database tables using the provider_id parameter in the calendar search function of OpenEMR 6.0.0 before patch 3.
The Impact of CVE-2021-41843
This vulnerability enables unauthorized users to read sensitive data stored in the database, posing a significant risk to data confidentiality and integrity.
Technical Details of CVE-2021-41843
Exploring the technical aspects of the SQL injection flaw.
Vulnerability Description
The issue resides in OpenEMR's calendar search function, where improper input validation on the provider_id parameter permits SQL injection attacks, leading to unauthorized data retrieval.
Affected Systems and Versions
- OpenEMR 6.0.0 versions prior to patch 3
Exploitation Mechanism
- Attackers exploit the SQL injection by manipulating the provider_id parameter in the /interface/main/calendar/index.php?module=PostCalendar&func=search URI to extract data from all database tables.
Mitigation and Prevention
Measures to address and prevent the CVE-2021-41843 vulnerability.
Immediate Steps to Take
- Apply the latest patch provided by OpenEMR to remediate the SQL injection issue.
- Monitor database access and queries for any suspicious activities.
- Restrict user privileges to limit access to sensitive data.
Long-Term Security Practices
- Conduct regular security assessments and penetration testing to identify and patch vulnerabilities proactively.
- Educate users on secure coding practices and the importance of parameterized queries to prevent SQL injection attacks.
Patching and Updates
- Ensure timely installation of software updates and security patches to mitigate known vulnerabilities and enhance system security.