CVE-2019-14439 : Exploit Details and Defense Strategies
Learn about CVE-2019-14439, a Polymorphic Typing issue in FasterXML jackson-databind 2.x. Find out the impact, affected systems, exploitation mechanism, and mitigation steps to secure your systems.
In versions prior to 2.9.9.2, a problem related to Polymorphic Typing was identified in FasterXML jackson-databind 2.x. This issue occurs when Default Typing is activated for a JSON endpoint that is publicly accessible, and the service includes the logback jar in its classpath.
Understanding CVE-2019-14439
A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9.2. This occurs when Default Typing is enabled for an externally exposed JSON endpoint and the service has the logback jar in the classpath.
What is CVE-2019-14439?
- Problem related to Polymorphic Typing in FasterXML jackson-databind 2.x
- Default Typing activation for a publicly accessible JSON endpoint
- Inclusion of the logback jar in the service's classpath
The Impact of CVE-2019-14439
- Allows for potential security vulnerabilities in affected systems
- Risk of unauthorized access and data compromise
Technical Details of CVE-2019-14439
In-depth technical information about the vulnerability.
Vulnerability Description
- Polymorphic Typing issue in FasterXML jackson-databind 2.x
- Default Typing enabled for exposed JSON endpoint
- Presence of logback jar in the classpath
Affected Systems and Versions
- Versions prior to 2.9.9.2 of FasterXML jackson-databind 2.x
- Systems with Default Typing activated for JSON endpoints
Exploitation Mechanism
- Activation of Default Typing for a publicly accessible JSON endpoint
- Inclusion of the logback jar in the service's classpath
Mitigation and Prevention
Steps to address and prevent the CVE-2019-14439 vulnerability.
Immediate Steps to Take
- Update FasterXML jackson-databind to version 2.9.9.2 or later
- Disable Default Typing for JSON endpoints if not required
- Remove the logback jar from the classpath if possible
Long-Term Security Practices
- Regularly monitor for security updates and patches
- Conduct security audits to identify vulnerabilities
Patching and Updates
- Apply security patches promptly
- Stay informed about security advisories and updates