CVE-2022-24880 : What You Need to Know

A security vulnerability in flask-session-captcha could allow bypassing captcha verification, impacting versions prior to 1.2.1.

Understanding CVE-2022-24880

This CVE involves an issue in the

captcha.validate()

function of flask-session-captcha that could lead to a potential captcha validate bypass.

What is CVE-2022-24880?

flask-session-captcha, a Flask extension for image-based captchas, had a flaw where bypassing the captcha verification check was possible in versions less than 1.2.1.

The Impact of CVE-2022-24880

The vulnerability could be exploited to bypass captcha verification, potentially leading to security breaches and unauthorized access.

Technical Details of CVE-2022-24880

The following are some technical details of the CVE:

Vulnerability Description

Versions prior to 1.2.1 of flask-session-captcha allowed the

captcha.validate()

function to return

None

, enabling a possible captcha verify bypass.

Affected Systems and Versions

The vulnerability impacts flask-session-captcha versions earlier than 1.2.1.

Exploitation Mechanism

By submitting an empty form, attackers could exploit the flaw to bypass captcha verification if users were incorrectly checking the return value.

Mitigation and Prevention

To address CVE-2022-24880, users should take immediate action and adopt long-term security practices to enhance protection.

Immediate Steps to Take

Upgrade flask-session-captcha to version 1.2.1 or later.
Avoid directly checking that the return value of

captcha.validate()

is False.

Long-Term Security Practices

Regularly update software and extensions to the latest versions.
Conduct thorough code reviews to identify and address potential security vulnerabilities.

Patching and Updates

Ensure prompt installation of patches and updates released by flask-session-captcha to mitigate the vulnerability.