CVE-2018-14635: Neutron Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-x634-34m9-96mp
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CVSS 6.5
CWE-20
Published
Advisory Summary

CVE-2018-14635 is a HIGH (CVSS 6.5) denial of service vulnerability (CWE-20: Improper Input Validation) affecting Neutron libraries in the PyPI ecosystem. The issue involves opensstack neutron denial of service vulnerability. Remediation is available by upgrading affected packages to version 13.0.0.0b2, 11.0.6, 12.0.4.

CVE-2018-14635 at a Glance

CVE Identifier CVE-2018-14635
GHSA Identifier GHSA-x634-34m9-96mp
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Neutron
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:3.0/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-2018-14635

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

neutron fixed: 13.0.0.0b2 
pip install neutron>=13.0.0.0b2
neutron fixed: 11.0.6 
pip install neutron>=11.0.6
neutron fixed: 12.0.4 
pip install neutron>=12.0.4
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 neutron

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-14635, inspect your installed packages using pip:

pip show neutron

Analyze the terminal output to locate any version of Neutron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 13.0.0.0b2), your application is affected.

Note: The pip show neutron 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 Neutron, 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

When using the Linux bridge ml2 driver, non-privileged tenants are able to create and attach ports without specifying an IP address, bypassing IP address validation. A potential denial of service could occur if an IP address, conflicting with existing guests or routers, is then assigned from outside of the allowed allocation pool. Versions of openstack-neutron before 13.0.0.0b2, 12.0.3 and 11.0.5 are vulnerable.

CVE-2018-14635 Affected Neutron Versions

3 component(s)
Fixed Versions:
13.0.0.0b211.0.612.0.4
Product / Package Ecosystem Affected Versions Fixed Version
neutron
pypi/neutron
PyPI
≥ 13.0.0.0b1
< 13.0.0.0b2
All 1 versions
13.0.0.0b1
13.0.0.0b2
neutron
pypi/neutron
PyPI
< 11.0.6
11.0.6
neutron
pypi/neutron
PyPI
≥ 12.0.0
< 12.0.4
12.0.4

References

NVD — CVE-2018-14635 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-14635
Security Fix Commit FIX COMMIT
https://github.com/openstack/neutron/commit/54aa6e81cb17b33ce4d5d469cc11dec2869c762d
access.redhat.com/errata/rhsa-2018:27... WEB
https://access.redhat.com/errata/RHSA-2018:2710
access.redhat.com/errata/rhsa-2018:27... WEB
https://access.redhat.com/errata/RHSA-2018:2715
access.redhat.com/errata/rhsa-2018:27... WEB
https://access.redhat.com/errata/RHSA-2018:2721
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3792
bugs.launchpad.net/neutron/+bug/175748... WEB
https://bugs.launchpad.net/neutron/+bug/1757482
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14635
git.openstack.org/cgit/openstack/neut... WEB
https://git.openstack.org/cgit/openstack/neutron/commit/?id=54aa6e81cb17b33ce4d5d469cc11dec2869c762d
Neutron Source Repository REPOSITORY
https://github.com/openstack/neutron
Neutron Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2018-93.yaml

Frequently Asked Questions

What is CVE-2018-14635?
CVE-2018-14635 is a security vulnerability in Neutron involving OpensStack Neutron Denial of Service Vulnerability under CWE-20: Improper Input Validation.
Which Neutron versions are affected?
Affected versions include releases prior to 13.0.0.0b2, 11.0.6, 12.0.4 across affected packages: neutron.
What version fixes CVE-2018-14635?
Upgrading to 13.0.0.0b2, 11.0.6, 12.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is neutron affected?
Yes, neutron is affected in releases prior to 13.0.0.0b2, 11.0.6, 12.0.4. Upgrade your dependency to 13.0.0.0b2, 11.0.6, 12.0.4 or later.
What is the CVSS score of CVE-2018-14635?
CVE-2018-14635 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2018-14635?
CVE-2018-14635 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-2018-14635?
Run the dependency tree command: 'pip show neutron'. 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-x634-34m9-96mp",
  "modified" : "2024-09-25T20:45:21Z",
  "published" : "2022-05-13T01:07:33Z",
  "aliases" : [ "CVE-2018-14635" ],
  "summary" : "OpensStack Neutron Denial of Service Vulnerability",
  "details" : "When using the Linux bridge ml2 driver, non-privileged tenants are able to create and attach ports without specifying an IP address, bypassing IP address validation. A potential denial of service could occur if an IP address, conflicting with existing guests or routers, is then assigned from outside of the allowed allocation pool. Versions of openstack-neutron before 13.0.0.0b2, 12.0.3 and 11.0.5 are vulnerable.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/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" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0.0b1"
      }, {
        "fixed" : "13.0.0.0b2"
      } ]
    } ],
    "versions" : [ "13.0.0.0b1" ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "11.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-14635"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openstack/neutron/commit/54aa6e81cb17b33ce4d5d469cc11dec2869c762d"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:2710"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:2715"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:2721"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3792"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/neutron/+bug/1757482"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14635"
  }, {
    "type" : "WEB",
    "url" : "https://git.openstack.org/cgit/openstack/neutron/commit/?id=54aa6e81cb17b33ce4d5d469cc11dec2869c762d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/neutron"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2018-93.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-08T18:53:04Z",
    "nvd_published_at" : "2018-09-10T19:29:00Z"
  }
}