CVE-2020-7965 : What You Need to Know

Webargs 5.x through 5.5.2 in flaskparser.py allows JSON POST requests across domains, leading to CSRF.

Understanding CVE-2020-7965

Webargs vulnerability in flaskparser.py allows accepting JSON input without proper Content-Type validation.

What is CVE-2020-7965?

Webargs 5.x through 5.5.2 in flaskparser.py lacks Content-Type header validation for JSON input.
Accepts valid JSON even with incorrect content type, enabling CSRF via JSON POST requests.

The Impact of CVE-2020-7965

Cross-Site Request Forgery (CSRF) attacks can be executed through JSON POST requests across domains.

Technical Details of CVE-2020-7965

Webargs vulnerability in flaskparser.py with inadequate Content-Type validation.

Vulnerability Description

flaskparser.py in Webargs 5.x through 5.5.2 does not verify the Content-Type header for JSON input.

Affected Systems and Versions

Product: Webargs
Vendor: N/A
Versions: 5.x through 5.5.2

Exploitation Mechanism

Attackers can exploit this vulnerability by sending JSON POST requests with incorrect Content-Type, leading to CSRF.

Mitigation and Prevention

Steps to address and prevent CVE-2020-7965

Immediate Steps to Take

Upgrade Webargs to version 5.5.3 or later to mitigate the vulnerability.
Validate Content-Type headers for JSON input to prevent CSRF attacks.

Long-Term Security Practices

Implement strict input validation mechanisms to ensure proper Content-Type checking.
Regularly monitor and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Stay informed about security patches and updates for Webargs to address known vulnerabilities.