CVE-2020-27196 Explained : Impact and Mitigation

PlayJava in Play Framework 2.6.0 through 2.8.2 is affected by a vulnerability that causes a Denial of Service due to a StackOverflowError when parsing deep JSON structures in HTTP requests.

Understanding CVE-2020-27196

This CVE involves a vulnerability in PlayJava in Play Framework versions 2.6.0 through 2.8.2 that can lead to a Denial of Service attack.

What is CVE-2020-27196?

An issue in PlayJava in Play Framework versions 2.6.0 through 2.8.2 allows for a Denial of Service attack by triggering a StackOverflowError when parsing deep JSON structures in HTTP requests.

The Impact of CVE-2020-27196

The vulnerability can be exploited to cause a Denial of Service condition, potentially disrupting the availability of affected systems.

Technical Details of CVE-2020-27196

PlayJava in Play Framework versions 2.6.0 through 2.8.2 is susceptible to a specific vulnerability.

Vulnerability Description

The issue arises from the eager parsing of HTTP request payloads based on the Content-Type header, leading to a StackOverflowError when processing deep JSON structures.

Affected Systems and Versions

Play Framework 2.6.0 through 2.8.2

Exploitation Mechanism

Sending a deep JSON structure to a valid POST endpoint can trigger the vulnerability, causing a StackOverflowError and subsequent Denial of Service.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Apply security patches provided by Play Framework promptly.
Implement network-level protections to mitigate potential attacks.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Conduct security assessments and audits to identify and address weaknesses.

Patching and Updates

Stay informed about security updates from Play Framework and apply them as soon as they are available.