CVE-2009-5012: Pyftpdlib Improper Access Control Vulnerability

HIGH
Advisory Identifier: GHSA-h4g7-8m7r-87r9
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CWE-284
Published
Advisory Summary

CVE-2009-5012 is a HIGH improper access control vulnerability (CWE-284: Improper Access Control) affecting Pyftpdlib libraries in the PyPI ecosystem. The issue involves improper access control in pyftpdlib. Remediation is available by upgrading affected packages to version 0.5.2.

CVE-2009-5012 at a Glance

CVE Identifier CVE-2009-5012
GHSA Identifier GHSA-h4g7-8m7r-87r9
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-284: Improper Access Control
Affected Product Pyftpdlib
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2009-5012

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

pyftpdlib fixed: 0.5.2 
pip install pyftpdlib>=0.5.2
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 pyftpdlib

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2009-5012, inspect your installed packages using pip:

pip show pyftpdlib

Analyze the terminal output to locate any version of Pyftpdlib in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.2), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Pyftpdlib, 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

ftpserver.py in pyftpdlib before 0.5.2 does not require the l permission for the MLST command, which allows remote authenticated users to bypass intended access restrictions and list the root directory via an FTP session.

CVE-2009-5012 Affected Pyftpdlib Versions

1 component(s)
Fixed Versions:
0.5.2
Product / Package Ecosystem Affected Versions Fixed Version
pyftpdlib
pypi/pyftpdlib
PyPI
< 0.5.2
0.5.2

References

NVD — CVE-2009-5012 NVD
https://nvd.nist.gov/vuln/detail/CVE-2009-5012
Pyftpdlib Source Repository REPOSITORY
https://github.com/giampaolo/pyftpdlib
Pyftpdlib Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-9.yaml
code.google.com/p/pyftpdlib/issues/... WEB
http://code.google.com/p/pyftpdlib/issues/detail?id=114
code.google.com/p/pyftpdlib/source/... WEB
http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY
code.google.com/p/pyftpdlib/source/... WEB
http://code.google.com/p/pyftpdlib/source/detail?r=596
code.google.com/p/pyftpdlib/source/... WEB
http://code.google.com/p/pyftpdlib/source/diff?spec=svn596&r=596&format=side&path=/trunk/pyftpdlib/ftpserver.py

Frequently Asked Questions

What is CVE-2009-5012?
CVE-2009-5012 is a security vulnerability in Pyftpdlib involving Improper Access Control in pyftpdlib under CWE-284: Improper Access Control.
Which Pyftpdlib versions are affected?
Affected versions include releases prior to 0.5.2 across affected packages: pyftpdlib.
What version fixes CVE-2009-5012?
Upgrading to 0.5.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pyftpdlib affected?
Yes, pyftpdlib is affected in releases prior to 0.5.2. Upgrade your dependency to 0.5.2 or later.
What CWE is associated with CVE-2009-5012?
CVE-2009-5012 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check PyPI dependencies for CVE-2009-5012?
Run the dependency tree command: 'pip show pyftpdlib'. 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-h4g7-8m7r-87r9",
  "modified" : "2024-10-14T16:52:32Z",
  "published" : "2022-05-02T04:00:26Z",
  "aliases" : [ "CVE-2009-5012" ],
  "summary" : "Improper Access Control in pyftpdlib",
  "details" : "ftpserver.py in pyftpdlib before 0.5.2 does not require the l permission for the MLST command, which allows remote authenticated users to bypass intended access restrictions and list the root directory via an FTP session.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pyftpdlib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.5.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2009-5012"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/giampaolo/pyftpdlib"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-9.yaml"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/issues/detail?id=114"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/source/detail?r=596"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/source/diff?spec=svn596&r=596&format=side&path=/trunk/pyftpdlib/ftpserver.py"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-17T22:29:32Z",
    "nvd_published_at" : "2010-10-19T20:00:00Z"
  }
}