Access Restriction Bypass Affecting flask-session-captcha Open this link in a new tab package, versions [,1.2.1)


0.0
medium
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • snyk-id

    SNYK-PYTHON-FLASKSESSIONCAPTCHA-2803309

  • published

    26 Apr 2022

  • disclosed

    26 Apr 2022

  • credit

    Guillaume Gomez

How to fix?

Upgrade flask-session-captcha to version 1.2.1 or higher.

Overview

flask-session-captcha is a Captcha implementation for flask and flask-session.

Affected versions of this package are vulnerable to Access Restriction Bypass by manipulating the captcha.validate() to return False, in that way the captcha verification check will be bypassed.

PoC:

if captcha.validate() == False:
    ... # abort
else:
   ... # do stuff