CVE-2019-14322: Werkzeug Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-j544-7q9p-6xp8
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2019-14322 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Werkzeug libraries in the PyPI ecosystem. The issue involves pallets werkzeug vulnerable to path traversal. Remediation is available by upgrading affected packages to version 0.15.5.

CVE-2019-14322 at a Glance

CVE Identifier CVE-2019-14322
GHSA Identifier GHSA-j544-7q9p-6xp8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Werkzeug
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2019-14322

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

werkzeug fixed: 0.15.5 
pip install werkzeug>=0.15.5
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 werkzeug

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-14322, inspect your installed packages using pip:

pip show werkzeug

Analyze the terminal output to locate any version of Werkzeug in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.15.5), your application is affected.

Note: The pip show werkzeug 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 Werkzeug, 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

In Pallets Werkzeug before 0.15.5, SharedDataMiddleware mishandles drive names (such as C:) in Windows pathnames.

CVE-2019-14322 Affected Werkzeug Versions

1 component(s)
Fixed Versions:
0.15.5
Product / Package Ecosystem Affected Versions Fixed Version
werkzeug
pypi/werkzeug
PyPI
< 0.15.5
0.15.5

References

NVD — CVE-2019-14322 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-14322
Werkzeug Source Repository REPOSITORY
https://github.com/pallets/werkzeug
palletsprojects.com/blog/werkzeug-0-15-... WEB
https://palletsprojects.com/blog/werkzeug-0-15-5-released
Werkzeug Security Information SECURITY
http://packetstormsecurity.com/files/163398/Pallets-Werkzeug-0.15.4-Path-Traversal.html

Frequently Asked Questions

What is CVE-2019-14322?
CVE-2019-14322 is a security vulnerability in Werkzeug involving Pallets Werkzeug vulnerable to Path Traversal under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Werkzeug versions are affected?
Affected versions include releases prior to 0.15.5 across affected packages: werkzeug.
What version fixes CVE-2019-14322?
Upgrading to 0.15.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is werkzeug affected?
Yes, werkzeug is affected in releases prior to 0.15.5. Upgrade your dependency to 0.15.5 or later.
What is the CVSS score of CVE-2019-14322?
CVE-2019-14322 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2019-14322?
CVE-2019-14322 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (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.).
How can I check PyPI dependencies for CVE-2019-14322?
Run the dependency tree command: 'pip show werkzeug'. 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-j544-7q9p-6xp8",
  "modified" : "2023-02-02T01:32:51Z",
  "published" : "2022-05-24T16:51:33Z",
  "aliases" : [ "CVE-2019-14322" ],
  "summary" : "Pallets Werkzeug vulnerable to Path Traversal",
  "details" : "In Pallets Werkzeug before 0.15.5, SharedDataMiddleware mishandles drive names (such as C:) in Windows pathnames.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "werkzeug"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.15.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-14322"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pallets/werkzeug"
  }, {
    "type" : "WEB",
    "url" : "https://palletsprojects.com/blog/werkzeug-0-15-5-released"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/163398/Pallets-Werkzeug-0.15.4-Path-Traversal.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-02T01:32:51Z",
    "nvd_published_at" : "2019-07-28T13:15:00Z"
  }
}