Vulnerability-Lookup

PYSEC-2022-193

Vulnerability from pysec - Published: 2022-04-25 22:15 - Updated: 2022-05-17 23:28

Details

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.

Impacted products

Name	purl
flask-session-captcha	pkg:pypi/flask-session-captcha

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-session-captcha",
        "purl": "pkg:pypi/flask-session-captcha"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2811ae23a38d33b620fb7a07de8837c6d65c13e4"
            }
          ],
          "repo": "https://github.com/Tethik/flask-session-captcha",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.1.0",
        "1.2.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2022-24880",
    "GHSA-7r87-cj48-wj45"
  ],
  "details": "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.",
  "id": "PYSEC-2022-193",
  "modified": "2022-05-17T23:28:25.264091Z",
  "published": "2022-04-25T22:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/pull/27"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45"
    }
  ]
}

CVE-2022-24880 (GCVE-0-2022-24880)

Vulnerability from cvelistv5 – Published: 2022-04-25 22:10 – Updated: 2025-04-23 18:32

Title

Potential Captcha Validate Bypass in flask-session-captcha

Summary

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.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 15:55 UTC

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

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/Tethik/flask-session-captcha/s…	x_refsource_CONFIRM
https://github.com/Tethik/flask-session-captcha/pull/27	x_refsource_MISC
https://github.com/Tethik/flask-session-captcha/c…	x_refsource_MISC
https://github.com/Tethik/flask-session-captcha/r…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Tethik	flask-session-captcha	Affected: < 1.2.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "providerMetadata": {
          "dateUpdated": "2024-08-03T04:29:00.717Z",
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          },
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            "url": "https://github.com/Tethik/flask-session-captcha/pull/27"
          },
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            "tags": [
              "x_refsource_MISC",
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            "url": "https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1"
          }
        ],
        "title": "CVE Program Container"
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        "metrics": [
          {
            "other": {
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                "id": "CVE-2022-24880",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2025-04-23T15:55:15.375455Z",
                "version": "2.0.3"
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      "metrics": [
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            "confidentialityImpact": "NONE",
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          "url": "https://github.com/Tethik/flask-session-captcha/pull/27"
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        {
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          "url": "https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1"
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      ],
      "source": {
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        "discovery": "UNKNOWN"
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      "title": "Potential Captcha Validate Bypass in flask-session-captcha",
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          "ID": "CVE-2022-24880",
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          "TITLE": "Potential Captcha Validate Bypass in flask-session-captcha"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "flask-session-captcha",
                      "version": {
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                            "version_value": "\u003c 1.2.1"
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        "impact": {
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            "version": "3.1"
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                  "value": "CWE-253: Incorrect Check of Function Return Value"
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                  "lang": "eng",
                  "value": "CWE-394: Unexpected Status Code or Return Value"
                }
              ]
            },
            {
              "description": [
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                  "lang": "eng",
                  "value": "CWE-754: Improper Check for Unusual or Exceptional Conditions"
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        "references": {
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            },
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

GHSA-7R87-CJ48-WJ45

Vulnerability from github – Published: 2022-04-26 21:19 – Updated: 2024-09-20 21:03

Summary

Potential Captcha Validate Bypass in flask-session-captcha

Details

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:

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.

if not captcha.validate():
    ... # abort
else:
   ... # do stuff

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

Severity

5.3 (Medium)


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

6.9 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-session-captcha"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-24880"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-253",
      "CWE-394",
      "CWE-754"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-04-26T21:19:52Z",
    "nvd_published_at": "2022-04-25T22:15:00Z",
    "severity": "MODERATE"
  },
  "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",
  "id": "GHSA-7r87-cj48-wj45",
  "modified": "2024-09-20T21:03:06Z",
  "published": "2022-04-26T21:19:52Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Potential Captcha Validate Bypass in flask-session-captcha"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

PYSEC-2022-193

CVE-2022-24880 (GCVE-0-2022-24880)

GHSA-7R87-CJ48-WJ45

Impact

Patches

Workarounds

References

For more information

Tags

Sightings

Nomenclature

Related by attack behaviour