CVE-2022-24880 Potential Captcha Validate Bypass in flask-session-captcha

2022-04-2522:10:13

CWE-394

CWE-754

CWE-253

GitHub_M

www.cve.org

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

0.001 Low

EPSS

Percentile

34.9%

JSON

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.

CNA Affected

[
  {
    "product": "flask-session-captcha",
    "vendor": "Tethik",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.2.1"
      }
    ]
  }
]