CVE-2019-16942 : Vulnerability Insights and Analysis

A problem involving Polymorphic Typing has been identified in FasterXML jackson-databind versions 2.0.0 through 2.9.10. If Default Typing is enabled, either globally or for a specific property, for a JSON endpoint that is publicly exposed and the service includes the commons-dbcp (1.4) jar in its classpath, an attacker who can locate an RMI service endpoint can potentially exploit this to execute unauthorized code. The root of this issue lies in the mishandling of org.apache.commons.dbcp datasources.

Understanding CVE-2019-16942

This CVE involves a vulnerability in FasterXML jackson-databind versions 2.0.0 through 2.9.10 that can be exploited by attackers to execute unauthorized code.

What is CVE-2019-16942?

CVE-2019-16942 is a Polymorphic Typing issue in FasterXML jackson-databind versions 2.0.0 through 2.9.10. Enabling Default Typing for a JSON endpoint with commons-dbcp (1.4) in the classpath can lead to unauthorized code execution.

The Impact of CVE-2019-16942

The vulnerability allows attackers to potentially execute unauthorized code by exploiting the mishandling of org.apache.commons.dbcp datasources in the affected versions of FasterXML jackson-databind.

Technical Details of CVE-2019-16942

This section provides detailed technical information about the CVE.

Vulnerability Description

The issue arises from a Polymorphic Typing problem in FasterXML jackson-databind versions 2.0.0 through 2.9.10, where enabling Default Typing for a JSON endpoint with commons-dbcp (1.4) in the classpath can lead to unauthorized code execution.

Affected Systems and Versions

FasterXML jackson-databind versions 2.0.0 through 2.9.10

Exploitation Mechanism

Attackers can exploit the vulnerability by locating an RMI service endpoint and leveraging the mishandling of org.apache.commons.dbcp datasources.

Mitigation and Prevention

Protect your systems from CVE-2019-16942 with the following steps:

Immediate Steps to Take

Disable Default Typing for JSON endpoints.
Remove or update the commons-dbcp (1.4) jar from the classpath.
Monitor for any unauthorized access attempts.

Long-Term Security Practices

Regularly update software and libraries to patched versions.
Implement network segmentation to limit exposure of critical services.
Conduct regular security audits and penetration testing.

Patching and Updates

Apply the latest patches and updates provided by FasterXML for jackson-databind.
Stay informed about security advisories and updates from relevant vendors.