CVE-2020-18704: Django widgy Unrestricted Upload Of File With Vulnerability

CRITICAL
Advisory Identifier: GHSA-98hv-qff3-8793
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CVSS 9.8
CWE-434
Published
Advisory Summary

CVE-2020-18704 is a CRITICAL (CVSS 9.8) unrestricted upload of file with vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Django widgy libraries in the PyPI ecosystem. The issue involves unrestricted upload of file with dangerous type in django-widgy. Remediation is available by upgrading affected packages to version 0.9.0.

CVE-2020-18704 at a Glance

CVE Identifier CVE-2020-18704
GHSA Identifier GHSA-98hv-qff3-8793
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Django widgy
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/A:H).

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-18704

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

django-widgy fixed: 0.9.0 
pip install django-widgy>=0.9.0
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 django-widgy

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-18704, inspect your installed packages using pip:

pip show django-widgy

Analyze the terminal output to locate any version of Django widgy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.0), your application is affected.

Note: The pip show django-widgy command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Django widgy, 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

Unrestricted Upload of File with Dangerous Type in Django-Widgy v0.8.4 allows remote attackers to execute arbitrary code via the 'image' widget in the component 'Change Widgy Page'.

CVE-2020-18704 Affected Django widgy Versions

1 component(s)
Fixed Versions:
0.9.0
Product / Package Ecosystem Affected Versions Fixed Version
django-widgy
pypi/django-widgy
PyPI
< 0.9.0
0.9.0

References

NVD — CVE-2020-18704 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-18704
Django widgy Source Repository REPOSITORY
https://github.com/fusionbox/django-widgy/issues/387
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-98hv-qff3-8793
Django widgy Source Repository REPOSITORY
https://github.com/fusionbox/django-widgy
Django widgy Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/django-widgy/PYSEC-2021-336.yaml

Frequently Asked Questions

What is CVE-2020-18704?
CVE-2020-18704 is a security vulnerability in Django widgy involving Unrestricted Upload of File with Dangerous Type in django-widgy under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Django widgy versions are affected?
Affected versions include releases prior to 0.9.0 across affected packages: django-widgy.
What version fixes CVE-2020-18704?
Upgrading to 0.9.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is django-widgy affected?
Yes, django-widgy is affected in releases prior to 0.9.0. Upgrade your dependency to 0.9.0 or later.
What is the CVSS score of CVE-2020-18704?
CVE-2020-18704 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-18704?
CVE-2020-18704 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check PyPI dependencies for CVE-2020-18704?
Run the dependency tree command: 'pip show django-widgy'. 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-98hv-qff3-8793",
  "modified" : "2024-09-16T22:06:25Z",
  "published" : "2021-08-30T16:24:08Z",
  "aliases" : [ "CVE-2020-18704" ],
  "summary" : "Unrestricted Upload of File with Dangerous Type in django-widgy",
  "details" : "Unrestricted Upload of File with Dangerous Type in Django-Widgy v0.8.4 allows remote attackers to execute arbitrary code via the 'image' widget in the component 'Change Widgy Page'.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "django-widgy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-18704"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fusionbox/django-widgy/issues/387"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-98hv-qff3-8793"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/fusionbox/django-widgy"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/django-widgy/PYSEC-2021-336.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-26T19:20:22Z",
    "nvd_published_at" : "2021-08-16T18:15:00Z"
  }
}