CVE-2007-6740: Pyftpdlib Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-cx59-cp6c-9fr8
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CVSS 6.5
CWE-770
Published
Advisory Summary

CVE-2007-6740 is a HIGH (CVSS 6.5) remote code execution vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Pyftpdlib libraries in the PyPI ecosystem. The issue involves pyftpdlib vulnerable to allocation of resources without limits. Remediation is available by upgrading affected packages to version 0.2.0.

CVE-2007-6740 at a Glance

CVE Identifier CVE-2007-6740
GHSA Identifier GHSA-cx59-cp6c-9fr8
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Pyftpdlib
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2007-6740

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-2007-6740, 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. 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

The ftp_STOU function in FTPServer.py in pyftpdlib before 0.2.0 does not limit the number of attempts to discover a unique filename, which might allow remote authenticated users to cause a denial of service via a STOU command.

CVE-2007-6740 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-2007-6740 NVD
https://nvd.nist.gov/vuln/detail/CVE-2007-6740
Pyftpdlib Source Repository REPOSITORY
https://github.com/giampaolo/pyftpdlib/issues/25
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-cx59-cp6c-9fr8
Pyftpdlib Source Repository REPOSITORY
https://github.com/giampaolo/pyftpdlib
Pyftpdlib Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-24.yaml
code.google.com/p/pyftpdlib/issues/... WEB
http://code.google.com/p/pyftpdlib/issues/detail?id=25
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=37
code.google.com/p/pyftpdlib/source/... WEB
http://code.google.com/p/pyftpdlib/source/diff?spec=svn37&r=37&format=side&path=/trunk/pyftpdlib/FTPServer.py

Frequently Asked Questions

What is CVE-2007-6740?
CVE-2007-6740 is a security vulnerability in Pyftpdlib involving pyftpdlib vulnerable to allocation of resources without limits under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Pyftpdlib versions are affected?
Affected versions include releases prior to 0.2.0 across affected packages: pyftpdlib.
What version fixes CVE-2007-6740?
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-2007-6740?
CVE-2007-6740 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2007-6740?
CVE-2007-6740 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check PyPI dependencies for CVE-2007-6740?
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-cx59-cp6c-9fr8",
  "modified" : "2024-10-21T21:02:01Z",
  "published" : "2022-05-01T18:45:58Z",
  "aliases" : [ "CVE-2007-6740" ],
  "summary" : "pyftpdlib vulnerable to allocation of resources without limits",
  "details" : "The ftp_STOU function in FTPServer.py in pyftpdlib before 0.2.0 does not limit the number of attempts to discover a unique filename, which might allow remote authenticated users to cause a denial of service via a STOU command.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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-2007-6740"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/giampaolo/pyftpdlib/issues/25"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-cx59-cp6c-9fr8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/giampaolo/pyftpdlib"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-24.yaml"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/issues/detail?id=25"
  }, {
    "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=37"
  }, {
    "type" : "WEB",
    "url" : "http://code.google.com/p/pyftpdlib/source/diff?spec=svn37&r=37&format=side&path=/trunk/pyftpdlib/FTPServer.py"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-08T22:33:05Z",
    "nvd_published_at" : "2010-10-19T20:00:00Z"
  }
}