CVE-2023-6976: Mlflow Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-wv8q-4f85-2p8p
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CVSS 8.8
CWE-434
Published
Advisory Summary

CVE-2023-6976 is a HIGH (CVSS 8.8) path traversal vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Mlflow libraries in the PyPI ecosystem. The issue involves mlflow path traversal vulnerability. Remediation is available by upgrading affected packages to version 2.9.2.

CVE-2023-6976 at a Glance

CVE Identifier CVE-2023-6976
GHSA Identifier GHSA-wv8q-4f85-2p8p
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Mlflow
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2023-6976

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

mlflow fixed: 2.9.2 
pip install mlflow>=2.9.2
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 mlflow

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-6976, inspect your installed packages using pip:

pip show mlflow

Analyze the terminal output to locate any version of Mlflow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.9.2), your application is affected.

Note: The pip show mlflow 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 Mlflow, 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

This vulnerability is capable of writing arbitrary files into arbitrary locations on the remote filesystem in the context of the server process.

CVE-2023-6976 Affected Mlflow Versions

1 component(s)
Fixed Versions:
2.9.2
Product / Package Ecosystem Affected Versions Fixed Version
mlflow
pypi/mlflow
PyPI
< 2.9.2
2.9.2

References

NVD — CVE-2023-6976 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6976
Security Fix Commit FIX COMMIT
https://github.com/mlflow/mlflow/commit/5044878da0c1851ccfdd5c0a867157ed9a502fbc
Mlflow Source Repository REPOSITORY
https://github.com/mlflow/mlflow
huntr.com/bounties/2408a52b-f... WEB
https://huntr.com/bounties/2408a52b-f05b-4cac-9765-4f74bac3f20f

Frequently Asked Questions

What is CVE-2023-6976?
CVE-2023-6976 is a security vulnerability in Mlflow involving MLflow Path Traversal Vulnerability under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Mlflow versions are affected?
Affected versions include releases prior to 2.9.2 across affected packages: mlflow.
What version fixes CVE-2023-6976?
Upgrading to 2.9.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mlflow affected?
Yes, mlflow is affected in releases prior to 2.9.2. Upgrade your dependency to 2.9.2 or later.
What is the CVSS score of CVE-2023-6976?
CVE-2023-6976 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2023-6976?
CVE-2023-6976 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-2023-6976?
Run the dependency tree command: 'pip show mlflow'. 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-wv8q-4f85-2p8p",
  "modified" : "2023-12-20T20:36:28Z",
  "published" : "2023-12-20T06:30:25Z",
  "aliases" : [ "CVE-2023-6976" ],
  "summary" : "MLflow Path Traversal Vulnerability",
  "details" : "This vulnerability is capable of writing arbitrary files into arbitrary locations on the remote filesystem in the context of the server process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "mlflow"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.9.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6976"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mlflow/mlflow/commit/5044878da0c1851ccfdd5c0a867157ed9a502fbc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mlflow/mlflow"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.com/bounties/2408a52b-f05b-4cac-9765-4f74bac3f20f"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-20T20:36:28Z",
    "nvd_published_at" : "2023-12-20T06:15:45Z"
  }
}