Vulnerabilities in pkg:pypi/flask-session-captcha

PACKAGE
Advisory Identifier: GHSA-7r87-cj48-wj45
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Advisory Summary

CVE-2022-24880 is a MODERATE (CVSS 5.3) potential captcha validate bypass vulnerability (CWE-253: Incorrect Check of Function Return Value) affecting Flask session captcha libraries in the PyPI ecosystem. The issue involves potential captcha validate bypass in flask-session-captcha. Remediation is available by upgrading affected packages to version 1.2.1.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/flask-session-captcha

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/flask-session-captcha. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-7r87-cj48-wj45 CVE-2022-24880 MODERATE Potential Captcha Validate Bypass in flask-session-captcha

CVE-2022-24880 at a Glance

CVE Identifier CVE-2022-24880
GHSA Identifier GHSA-7r87-cj48-wj45
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-253: Incorrect Check of Function Return Value
Affected Product Flask session captcha
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2022-24880

To remediate this vulnerability, upgrade all affected Flask session captcha dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

flask-session-captcha fixed: 1.2.1 
pip install flask-session-captcha>=1.2.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show flask-session-captcha

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-24880, inspect your installed packages using pip:

pip show flask-session-captcha

Analyze the terminal output to locate any version of Flask session captcha in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.1), your application is affected.

Note: The pip show flask-session-captcha command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-253: Incorrect Check of Function Return Value, where the product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions. In Flask session captcha, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. The `captcha.validate()` function would return `None` if passed no value (e.g. by submitting a request with an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Sample vulnerable code: ```python if captcha.validate() == False: ... # abort else: ... # do stuff ``` ### Patches A new version (1.2.1) is available that fixes the issue. ### Workarounds Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work. ```python if not captcha.validate(): ... # abort else: ... # do stuff ``` ```python if captcha.validate(): ... # do stuff else: ... # abort ``` ### References https://github.com/Tethik/flask-session-captcha/pull/27 ### For more information If you have any questions or comments about this advisory: * Open an issue in [the github repo](https://github.com/Tethik/flask-session-captcha)

CVE-2022-24880 Affected Flask session captcha Versions

1 component(s)
Fixed Versions:
1.2.1
Product / Package Ecosystem Affected Versions Fixed Version
flask-session-captcha
pypi/flask-session-captcha
PyPI
< 1.2.1
1.2.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45
NVD — CVE-2022-24880 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-24880
Flask session captcha Source Repository REPOSITORY
https://github.com/Tethik/flask-session-captcha/pull/27
Security Fix Commit FIX COMMIT
https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4
Flask session captcha Source Repository REPOSITORY
https://github.com/Tethik/flask-session-captcha
Flask session captcha Release RELEASE
https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1
Flask session captcha Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/flask-session-captcha/PYSEC-2022-193.yaml

Frequently Asked Questions

What is CVE-2022-24880?
CVE-2022-24880 is a security vulnerability in Flask session captcha involving Potential Captcha Validate Bypass in flask-session-captcha under CWE-253: Incorrect Check of Function Return Value.
Which Flask session captcha versions are affected?
Affected versions include releases prior to 1.2.1 across affected packages: flask-session-captcha.
What version fixes CVE-2022-24880?
Upgrading to 1.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is flask-session-captcha affected?
Yes, flask-session-captcha is affected in releases prior to 1.2.1. Upgrade your dependency to 1.2.1 or later.
What is the CVSS score of CVE-2022-24880?
CVE-2022-24880 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2022-24880?
CVE-2022-24880 is classified under CWE-253: Incorrect Check of Function Return Value (The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions.).
How can I check PyPI dependencies for CVE-2022-24880?
Run the dependency tree command: 'pip show flask-session-captcha'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7r87-cj48-wj45",
  "modified" : "2024-09-20T21:03:06Z",
  "published" : "2022-04-26T21:19:52Z",
  "aliases" : [ "CVE-2022-24880" ],
  "summary" : "Potential Captcha Validate Bypass in flask-session-captcha",
  "details" : "### Impact\nflask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session.\n\nThe `captcha.validate()` function would return `None` if passed no value (e.g. by submitting a request with an empty form).\n\nIf implementing users were checking the return value to be **False**, the captcha verification check could be bypassed.\n\nSample vulnerable code:\n```python\nif captcha.validate() == False:\n    ... # abort\nelse:\n   ... # do stuff\n```\n\n### Patches\nA new version (1.2.1) is available that fixes the issue.\n\n### Workarounds\nUsers can workaround the issue by not explicitly checking that the value is False. \n\nChecking the return value less explicitly should still work. \n\n```python\nif not captcha.validate():\n    ... # abort\nelse:\n   ... # do stuff\n```\n\n```python\nif captcha.validate():\n    ... # do stuff\nelse:\n   ... # abort\n```\n\n### References\nhttps://github.com/Tethik/flask-session-captcha/pull/27\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [the github repo](https://github.com/Tethik/flask-session-captcha)\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "flask-session-captcha"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-24880"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Tethik/flask-session-captcha/pull/27"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Tethik/flask-session-captcha"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/flask-session-captcha/PYSEC-2022-193.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-253", "CWE-394", "CWE-754" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-26T21:19:52Z",
    "nvd_published_at" : "2022-04-25T22:15:00Z"
  }
}