CVE-2019-12814 : Exploit Details and Defense Strategies
Learn about CVE-2019-12814, a vulnerability in FasterXML jackson-databind 2.x allowing unauthorized access to read arbitrary local files. Find mitigation steps and update recommendations here.
A vulnerability related to Polymorphic Typing has been found in FasterXML jackson-databind 2.x until version 2.9.9. If Default Typing is enabled for a JSON endpoint and the JDOM 1.x or 2.x jar is present, an attacker could exploit this issue to gain unauthorized access.
Understanding CVE-2019-12814
This CVE involves a security vulnerability in FasterXML jackson-databind 2.x versions up to 2.9.9, allowing unauthorized access to read arbitrary local files on the server.
What is CVE-2019-12814?
This CVE identifies a Polymorphic Typing issue in FasterXML jackson-databind 2.x through 2.9.9, enabling attackers to read arbitrary local files on the server.
The Impact of CVE-2019-12814
The vulnerability allows attackers to gain unauthorized access to sensitive information on the server by exploiting the Polymorphic Typing issue in jackson-databind.
Technical Details of CVE-2019-12814
This section provides detailed technical information about the CVE.
Vulnerability Description
The vulnerability in FasterXML jackson-databind 2.x versions up to 2.9.9 allows attackers to read arbitrary local files on the server by sending a crafted JSON message.
Affected Systems and Versions
- FasterXML jackson-databind 2.x until version 2.9.9
- Systems with JDOM 1.x or 2.x jar present in the classpath
Exploitation Mechanism
- Default Typing enabled for a JSON endpoint
- Presence of JDOM 1.x or 2.x jar in the service's classpath
- Attacker sends a carefully crafted JSON message to exploit the vulnerability
Mitigation and Prevention
Protect your systems from CVE-2019-12814 with the following steps:
Immediate Steps to Take
- Disable Default Typing for JSON endpoints
- Remove JDOM 1.x or 2.x jar from the classpath if not required
- Monitor and restrict external access to sensitive endpoints
Long-Term Security Practices
- Regularly update and patch software components
- Implement network segmentation to limit exposure
- Conduct security audits and penetration testing
Patching and Updates
- Update FasterXML jackson-databind to version 2.9.9.1 or later to address the vulnerability