CVE-2021-28658: Django Path Traversal Vulnerability
MODERATECVE-2021-28658 is a MODERATE (CVSS 5.3) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Django libraries in the PyPI ecosystem. The issue involves directory traversal in django. Remediation is available by upgrading affected packages to version 2.2.20, 3.0.14, 3.1.8.
CVE-2021-28658 at a Glance
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:L/I:N/A:N).
How to Fix CVE-2021-28658
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.
pip install Django>=2.2.20pip install Django>=3.0.14pip install Django>=3.1.8Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show DjangoHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2021-28658, inspect your installed packages using pip:
pip show DjangoAnalyze 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 2.2.20), 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. 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
CVE-2021-28658 Affected Django Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Django
|
PyPI |
≥ 2.2a1
< 2.2.20
|
2.2.20
|
|
Django
|
PyPI |
≥ 3.0a1
< 3.0.14
|
3.0.14
|
|
Django
|
PyPI |
≥ 3.1a1
< 3.1.8
|
3.1.8
|
References
Frequently Asked Questions
What is CVE-2021-28658?
Which Django versions are affected?
What version fixes CVE-2021-28658?
Is Django affected?
What is the CVSS score of CVE-2021-28658?
What CWE is associated with CVE-2021-28658?
How can I check PyPI dependencies for CVE-2021-28658?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-xgxc-v2qg-chmh",
"modified" : "2024-09-20T15:47:26Z",
"published" : "2021-04-08T18:11:48Z",
"aliases" : [ "CVE-2021-28658" ],
"summary" : "Directory Traversal in Django",
"details" : "In Django 2.2 before 2.2.20, 3.0 before 3.0.14, and 3.1 before 3.1.8, MultiPartParser allowed directory traversal via uploaded files with suitably crafted file names. Built-in upload handlers were not affected by this vulnerability.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "Django"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.2a1"
}, {
"fixed" : "2.2.20"
} ]
} ]
}, {
"package" : {
"ecosystem" : "PyPI",
"name" : "Django"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.0a1"
}, {
"fixed" : "3.0.14"
} ]
} ]
}, {
"package" : {
"ecosystem" : "PyPI",
"name" : "Django"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.1a1"
}, {
"fixed" : "3.1.8"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-28658"
}, {
"type" : "WEB",
"url" : "https://docs.djangoproject.com/en/3.1/releases/security"
}, {
"type" : "ADVISORY",
"url" : "https://github.com/advisories/GHSA-xgxc-v2qg-chmh"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/django/django"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2021-6.yaml"
}, {
"type" : "WEB",
"url" : "https://groups.google.com/g/django-announce/c/ePr5j-ngdPU"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2021/04/msg00008.html"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZVKYPHR3TKR2ESWXBPOJEKRO2OSJRZUE"
}, {
"type" : "WEB",
"url" : "https://pypi.org/project/Django"
}, {
"type" : "WEB",
"url" : "https://security.netapp.com/advisory/ntap-20210528-0001"
}, {
"type" : "WEB",
"url" : "https://www.djangoproject.com/weblog/2021/apr/06/security-releases"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2021-04-08T18:11:26Z",
"nvd_published_at" : "2021-04-06T15:15:00Z"
}
}