CVE-2019-9735: Neutron OpenStack Neutron's Unsupported Dport Option Vulnerability

HIGH
Advisory Identifier: GHSA-9773-3fqg-8w25
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CVSS 6.5
CWE-755
Published
Advisory Summary

CVE-2019-9735 is a HIGH (CVSS 6.5) openstack neutron's unsupported dport option vulnerability (CWE-755: Improper Handling of Exceptional Conditions) affecting Neutron libraries in the PyPI ecosystem. The issue involves openstack neutron's unsupported dport option prevents applying security groups. Remediation is available by upgrading affected packages to version 10.0.8, 11.0.7, 12.0.6, 13.0.3.

CVE-2019-9735 at a Glance

CVE Identifier CVE-2019-9735
GHSA Identifier GHSA-9773-3fqg-8w25
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-755: Improper Handling of Exceptional Conditions
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-2019-9735

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: 10.0.8 
pip install neutron>=10.0.8
neutron fixed: 11.0.7 
pip install neutron>=11.0.7
neutron fixed: 12.0.6 
pip install neutron>=12.0.6
neutron fixed: 13.0.3 
pip install neutron>=13.0.3
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-2019-9735, 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 10.0.8), 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-755: Improper Handling of Exceptional Conditions, where the product does not handle or incorrectly handles an exceptional condition. 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

An issue was discovered in the iptables firewall module in OpenStack Neutron before 10.0.8, 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. By setting a destination port in a security group rule along with a protocol that doesn't support that option (for example, VRRP), an authenticated user may block further application of security group rules for instances from any project/tenant on the compute hosts to which it's applied. (Only deployments using the iptables security group driver are affected.)

CVE-2019-9735 Affected Neutron Versions

4 component(s)
Fixed Versions:
10.0.811.0.712.0.613.0.3
Product / Package Ecosystem Affected Versions Fixed Version
neutron
pypi/neutron
PyPI
< 10.0.8
10.0.8
neutron
pypi/neutron
PyPI
≥ 11.0.0
< 11.0.7
11.0.7
neutron
pypi/neutron
PyPI
≥ 12.0.0
< 12.0.6
12.0.6
neutron
pypi/neutron
PyPI
≥ 13.0.0
< 13.0.3
13.0.3

References

NVD — CVE-2019-9735 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-9735
access.redhat.com/errata/rhsa-2019:08... WEB
https://access.redhat.com/errata/RHSA-2019:0879
access.redhat.com/errata/rhsa-2019:09... WEB
https://access.redhat.com/errata/RHSA-2019:0916
access.redhat.com/errata/rhsa-2019:09... WEB
https://access.redhat.com/errata/RHSA-2019:0935
Neutron Source Repository REPOSITORY
https://github.com/openstack/neutron
Neutron Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2019-190.yaml
launchpad.net/bugs/1818385 WEB
https://launchpad.net/bugs/1818385
seclists.org/bugtraq/2019/mar/24 WEB
https://seclists.org/bugtraq/2019/Mar/24
Neutron Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2019-001.html
usn.ubuntu.com/4036-1 WEB
https://usn.ubuntu.com/4036-1
Neutron Security Information SECURITY
https://web.archive.org/web/20201208185619/http://www.securityfocus.com/bid/107390
Neutron Security Information SECURITY
https://www.debian.org/security/2019/dsa-4409
Neutron Security Information SECURITY
http://www.openwall.com/lists/oss-security/2019/03/18/2
Neutron Security Information SECURITY
http://www.securityfocus.com/bid/107390

Frequently Asked Questions

What is CVE-2019-9735?
CVE-2019-9735 is a security vulnerability in Neutron involving OpenStack Neutron's unsupported dport option prevents applying security groups under CWE-755: Improper Handling of Exceptional Conditions.
Which Neutron versions are affected?
Affected versions include releases prior to 10.0.8, 11.0.7, 12.0.6, 13.0.3 across affected packages: neutron.
What version fixes CVE-2019-9735?
Upgrading to 10.0.8, 11.0.7, 12.0.6, 13.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is neutron affected?
Yes, neutron is affected in releases prior to 10.0.8, 11.0.7, 12.0.6, 13.0.3. Upgrade your dependency to 10.0.8, 11.0.7, 12.0.6, 13.0.3 or later.
What is the CVSS score of CVE-2019-9735?
CVE-2019-9735 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-2019-9735?
CVE-2019-9735 is classified under CWE-755: Improper Handling of Exceptional Conditions (The product does not handle or incorrectly handles an exceptional condition.).
How can I check PyPI dependencies for CVE-2019-9735?
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-9773-3fqg-8w25",
  "modified" : "2024-10-03T21:27:55Z",
  "published" : "2022-05-13T01:07:34Z",
  "aliases" : [ "CVE-2019-9735" ],
  "summary" : "OpenStack Neutron's unsupported dport option prevents applying security groups",
  "details" : "An issue was discovered in the iptables firewall module in OpenStack Neutron before 10.0.8, 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. By setting a destination port in a security group rule along with a protocol that doesn't support that option (for example, VRRP), an authenticated user may block further application of security group rules for instances from any project/tenant on the compute hosts to which it's applied. (Only deployments using the iptables security group driver are affected.)",
  "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" : "0"
      }, {
        "fixed" : "10.0.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.0.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "12.0.0"
      }, {
        "fixed" : "12.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "neutron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "fixed" : "13.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-9735"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0879"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0916"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0935"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/neutron"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2019-190.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://launchpad.net/bugs/1818385"
  }, {
    "type" : "WEB",
    "url" : "https://seclists.org/bugtraq/2019/Mar/24"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2019-001.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4036-1"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20201208185619/http://www.securityfocus.com/bid/107390"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2019/dsa-4409"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2019/03/18/2"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/107390"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-755" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-08T18:55:25Z",
    "nvd_published_at" : "2019-03-13T02:29:00Z"
  }
}