CVE-2020-13254: Django Data Leakage Vulnerability

HIGH
Advisory Identifier: GHSA-wpjr-j57x-wxfw
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CVSS 5.9
CWE-295
Published
Advisory Summary

CVE-2020-13254 is a HIGH (CVSS 5.9) data leakage vulnerability (CWE-295: Improper Certificate Validation) affecting Django libraries in the PyPI ecosystem. The issue involves data leakage via cache key collision in django. Remediation is available by upgrading affected packages to version 2.2.13, 3.0.7.

CVE-2020-13254 at a Glance

CVE Identifier CVE-2020-13254
GHSA Identifier GHSA-wpjr-j57x-wxfw
Severity HIGH
CVSS v3.1 Base Score 5.9
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Django
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

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

How to Fix CVE-2020-13254

To remediate this vulnerability, upgrade all affected Django 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 fixed: 2.2.13 
pip install Django>=2.2.13
Django fixed: 3.0.7 
pip install Django>=3.0.7
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

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-13254, inspect your installed packages using pip:

pip show Django

Analyze the terminal output to locate any version of Django in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.13), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Django, 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

An issue was discovered in Django version 2.2 before 2.2.13 and 3.0 before 3.0.7. In cases where a memcached backend does not perform key validation, passing malformed cache keys could result in a key collision, and potential data leakage.

CVE-2020-13254 Affected Django Versions

2 component(s)
Fixed Versions:
2.2.133.0.7
Product / Package Ecosystem Affected Versions Fixed Version
Django
pypi/Django
PyPI
≥ 2.2
< 2.2.13
2.2.13
Django
pypi/Django
PyPI
≥ 3.0
< 3.0.7
3.0.7

References

usn.ubuntu.com/4381-2 WEB
https://usn.ubuntu.com/4381-2
Django Security Information SECURITY
https://www.debian.org/security/2020/dsa-4705
NVD — CVE-2020-13254 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13254
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/07e59caa02831c4569bbebb9eb773bdd9cb4b206
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/84b2da5552e100ae3294f564f6c862fef8d0e693
Django Release RELEASE
https://docs.djangoproject.com/en/3.0/releases/security
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-wpjr-j57x-wxfw
Django Source Repository REPOSITORY
https://github.com/django/django
Django Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2020-31.yaml
groups.google.com/d/msg/django-announ... WEB
https://groups.google.com/d/msg/django-announce/pPEmb2ot4Fo/X-SMalYSBAAJ
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2020/06/msg00016.html
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4A2AP4T7RKPBCLTI2NNQG3T6MINDUUMZ
Django Security Information SECURITY
https://security.netapp.com/advisory/ntap-20200611-0002
usn.ubuntu.com/4381-1 WEB
https://usn.ubuntu.com/4381-1
Django Release RELEASE
https://www.djangoproject.com/weblog/2020/jun/03/security-releases
Django Security Information SECURITY
https://www.oracle.com/security-alerts/cpujan2021.html

Frequently Asked Questions

What is CVE-2020-13254?
CVE-2020-13254 is a security vulnerability in Django involving Data leakage via cache key collision in Django under CWE-295: Improper Certificate Validation.
Which Django versions are affected?
Affected versions include releases prior to 2.2.13, 3.0.7 across affected packages: Django.
What version fixes CVE-2020-13254?
Upgrading to 2.2.13, 3.0.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Django affected?
Yes, Django is affected in releases prior to 2.2.13, 3.0.7. Upgrade your dependency to 2.2.13, 3.0.7 or later.
What is the CVSS score of CVE-2020-13254?
CVE-2020-13254 has a CVSS v3.1 base score of 5.9 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2020-13254?
CVE-2020-13254 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check PyPI dependencies for CVE-2020-13254?
Run the dependency tree command: 'pip show Django'. 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-wpjr-j57x-wxfw",
  "modified" : "2024-11-18T16:26:05Z",
  "published" : "2020-06-05T16:20:44Z",
  "aliases" : [ "CVE-2020-13254" ],
  "summary" : "Data leakage via cache key collision in Django",
  "details" : "An issue was discovered in Django version 2.2 before 2.2.13 and 3.0 before 3.0.7. In cases where a memcached backend does not perform key validation, passing malformed cache keys could result in a key collision, and potential data leakage.",
  "severity" : [ {
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  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
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    } ]
  } ],
  "references" : [ {
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  }, {
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    "url" : "https://github.com/django/django/commit/07e59caa02831c4569bbebb9eb773bdd9cb4b206"
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    "type" : "WEB",
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  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2020-31.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/d/msg/django-announce/pPEmb2ot4Fo/X-SMalYSBAAJ"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2020/06/msg00016.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4A2AP4T7RKPBCLTI2NNQG3T6MINDUUMZ"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20200611-0002"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4381-1"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4381-2"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2020/dsa-4705"
  }, {
    "type" : "WEB",
    "url" : "https://www.djangoproject.com/weblog/2020/jun/03/security-releases"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpujan2021.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-04T18:32:36Z",
    "nvd_published_at" : "2020-06-03T14:15:00Z"
  }
}