CVE-2020-5247 : Vulnerability Insights and Analysis

In Puma (RubyGem) before 4.3.2 and before 3.12.3, a vulnerability allows attackers to inject malicious content via newline characters in response headers, leading to HTTP Response Splitting.

Understanding CVE-2020-5247

This CVE pertains to a security vulnerability in the Puma RubyGem that could be exploited for various attacks.

What is CVE-2020-5247?

CVE-2020-5247 is a vulnerability in Puma that enables attackers to manipulate response headers, potentially leading to further attacks like cross-site scripting (XSS).

The Impact of CVE-2020-5247

The vulnerability allows attackers to inject malicious content by exploiting newline characters in response headers, posing a risk of HTTP Response Splitting.

Technical Details of CVE-2020-5247

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in Puma allows attackers to end response headers with newline characters, enabling the injection of malicious content.

Affected Systems and Versions

Affected versions include Puma < 3.12.3 and >= 4.0.0, < 4.3.2

Exploitation Mechanism

Attackers can use newline characters in response headers to inject malicious content, potentially leading to HTTP Response Splitting.

Mitigation and Prevention

Protective measures to address the CVE.

Immediate Steps to Take

Update Puma to versions 4.3.2 or 3.12.3 to mitigate the vulnerability
Avoid allowing untrusted input in response headers

Long-Term Security Practices

Regularly monitor and update dependencies for known vulnerabilities
Implement input validation and output encoding to prevent injection attacks

Patching and Updates

Apply patches provided by Puma promptly to address the vulnerability