// For flags

CVE-2022-24880

Potential Captcha Validate Bypass in flask-session-captcha

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work.

flask-session-captcha es un paquete que permite a usuarios ampliar Flask al añadir un captcha basado en una imagen almacenada en una sesión del lado del servidor. En versiones anteriores a 1.2.1, la función "captcha.validate()" devolvía "None" si no le es pasado ningún valor (por ejemplo, al enviar un formulario vacío). Si usuarios implementadores comprobaban que el valor de retorno era **False**, la comprobación del captcha podía omitirse. La versión 1.2.1 corrige el problema. Los usuarios pueden mitigar el problema al no comprobar explícitamente que el valor es False. Comprobar el valor de retorno de forma menos explícita debería seguir funcionando

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-02-10 CVE Reserved
  • 2022-04-25 CVE Published
  • 2024-08-03 CVE Updated
  • 2024-11-03 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-253: Incorrect Check of Function Return Value
  • CWE-394: Unexpected Status Code or Return Value
  • CWE-754: Improper Check for Unusual or Exceptional Conditions
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Flask-session-captcha Project
Search vendor "Flask-session-captcha Project"
 Flask-session-captcha
Search vendor "Flask-session-captcha Project" for product "Flask-session-captcha"
 < 1.2.1
Search vendor "Flask-session-captcha Project" for product "Flask-session-captcha" and version " < 1.2.1"
-
Affected