CVE-2007-6739: Pyftpdlib Improper Input Validation Vulnerability

HIGH
Advisory Identifier: GHSA-5f3f-pg2c-cxcv
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2007-6739 is a HIGH (CVSS 7.5) improper input validation vulnerability (CWE-20: Improper Input Validation) affecting Pyftpdlib libraries in the PyPI ecosystem. The issue involves improper input validation in pyftpdlib. Remediation is available by upgrading affected packages to version 0.2.0.

CVE-2007-6739 at a Glance

CVE Identifier CVE-2007-6739
GHSA Identifier GHSA-5f3f-pg2c-cxcv
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Pyftpdlib
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:N/I:N/A:H).

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

How to Fix CVE-2007-6739

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: 0.2.0 
pip install pyftpdlib>=0.2.0
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-2007-6739, 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 0.2.0), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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 0.2.0 allows remote attackers to cause a denial of service via a long command.

CVE-2007-6739 Affected Pyftpdlib Versions

1 component(s)
Fixed Versions:
0.2.0
Product / Package Ecosystem Affected Versions Fixed Version
pyftpdlib
pypi/pyftpdlib
PyPI
< 0.2.0
0.2.0

References

NVD — CVE-2007-6739 NVD
https://nvd.nist.gov/vuln/detail/CVE-2007-6739
Pyftpdlib Source Repository REPOSITORY
https://github.com/giampaolo/pyftpdlib/issues/3
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-5f3f-pg2c-cxcv
Pyftpdlib Source Repository REPOSITORY
https://github.com/giampaolo/pyftpdlib
Pyftpdlib Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-23.yaml
code.google.com/p/pyftpdlib/issues/... WEB
http://code.google.com/p/pyftpdlib/issues/detail?id=3
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=20
code.google.com/p/pyftpdlib/source/... WEB
http://code.google.com/p/pyftpdlib/source/diff?spec=svn20&r=20&format=side&path=/trunk/pyftpdlib/FTPServer.py

Frequently Asked Questions

What is CVE-2007-6739?
CVE-2007-6739 is a security vulnerability in Pyftpdlib involving Improper Input Validation in pyftpdlib under CWE-20: Improper Input Validation.
Which Pyftpdlib versions are affected?
Affected versions include releases prior to 0.2.0 across affected packages: pyftpdlib.
What version fixes CVE-2007-6739?
Upgrading to 0.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pyftpdlib affected?
Yes, pyftpdlib is affected in releases prior to 0.2.0. Upgrade your dependency to 0.2.0 or later.
What is the CVSS score of CVE-2007-6739?
CVE-2007-6739 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:N/I:N/A:H.
What CWE is associated with CVE-2007-6739?
CVE-2007-6739 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2007-6739?
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-5f3f-pg2c-cxcv",
  "modified" : "2024-10-21T21:01:31Z",
  "published" : "2022-05-01T18:45:57Z",
  "aliases" : [ "CVE-2007-6739" ],
  "summary" : "Improper Input Validation in pyftpdlib",
  "details" : "FTPServer.py in pyftpdlib before 0.2.0 allows remote attackers to cause a denial of service via a long command.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pyftpdlib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2007-6739"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/giampaolo/pyftpdlib/issues/3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-5f3f-pg2c-cxcv"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/giampaolo/pyftpdlib"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-23.yaml"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/issues/detail?id=3"
  }, {
    "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=20"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/source/diff?spec=svn20&r=20&format=side&path=/trunk/pyftpdlib/FTPServer.py"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-08T22:28:57Z",
    "nvd_published_at" : "2010-10-19T20:00:00Z"
  }
}