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Ubuntu LinuxOperating system · Canonical

CVE-2014-0187

HIGH · 9.0 CVSS v2.0 Published 2014-04-28
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
96/100
Remediation priority · Urgent
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The openvswitch-agent process in OpenStack Neutron 2013.1 before 2013.2.4 and 2014.1 before 2014.1.1 allows remote authenticated users to bypass security group restrictions via an invalid CIDR in a security group rule, which prevents further rules from being applied.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

In OpenStack Neutron's openvswitch-agent, security group rules are processed sequentially. When an invalid CIDR (e.g., malformed or out-of-range) is submitted in a security group rule, the agent fails to parse it and halts processing of subsequent rules entirely. This allows an authenticated attacker to bypass security group enforcement by inserting an invalid CIDR rule, causing all rules after it to be ignored by the firewall.

MitigationUpgrade Neutron to version 2013.2.4 or 2014.1.1 or later, which includes proper validation of CIDR inputs before processing security group rules. Alternatively, implement input validation at the API layer to reject invalid CIDR formats before they reach the openvswitch-agent.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ubuntu LinuxOperating system
Affected:= 13.04= 14.04
NeutronApplication
Affected:= 2013.1= 2013.1.1= 2013.1.2= 2013.1.3= 2013.1.4= 2013.1.5= 2013.2= 2013.2.1= 2013.2.2= 2013.2.3= 2014.1
OpensuseOperating system
Affected:= 13.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:S/C:C/I:C/A:C

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Neutron installation and version
    Run 'neutron --version' or check the installed package version via package manager (dpkg -l | grep neutron or rpm -qa | grep neutron)
    Affected if The installed version matches any of: 2013.1, 2013.1.1, 2013.1.2, 2013.1.3, 2013.1.4, 2013.1.5, 2013.2, 2013.2.1, 2013.2.2, 2013.2.3, 2014.1 (or Ubuntu 13.04/14.04 or openSUSE 13.1 with neutron packages from these releases)
  2. Verify openvswitch-agent is deployed
    Check running processes for 'neutron-openvswitch-agent' or check /etc/neutron/plugins/openvswitch/ for configuration files
    Affected if The openvswitch-agent service is running and handling security groups
  3. Confirm security groups are in use
    List security groups with 'neutron security-group-list' or check neutron configuration files for 'enable_security_group = True' in /etc/neutron/
    Affected if Security groups are enabled and instances are using them
  4. Identify the firewall driver
    Check neutron configuration (usually /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini) for 'firewall_driver' setting under the securitygroup section
    Affected if The firewall driver is set to use openvswitch-agent (e.g., neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver or similar openvswitch-based firewall driver)

You are affected if Neutron version is 2013.1 through 2014.1 (or Ubuntu 13.04/14.04/openSUSE 13.1 packages from these releases) AND the openvswitch-agent is handling security groups with a vulnerable firewall driver.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Neutron to version 2013.2.4 or 2014.1.1 or later, which includes proper validation of CIDR inputs before processing security group rules. Alternatively, implement input validation at the API layer to reject invalid CIDR formats before they reach the openvswitch-agent.

Recommended fix High confidence

Neutron 2013.2.4 or later (for 2013.x branch) or Neutron 2014.1.1 or later (for 2014.x branch)

  1. 1. Identify the current Neutron version by running: neutron --version or dpkg -l | grep neutron
  2. 2. For Ubuntu systems: Run 'apt-get update' and 'apt-get install neutron' to upgrade to the latest available fixed version
  3. 3. For openSUSE systems: Run 'zypper update neutron' to apply the security patch
  4. 4. After upgrading, restart the openvswitch-agent service: 'service neutron-plugin-openvswitch-agent restart'
  5. 5. Verify the upgrade was successful by checking the Neutron version again
  6. 6. Test that security group rules with invalid CIDRs are now properly handled and don't cause rule bypass
Caveat Neutron upgrades may require corresponding upgrades to other OpenStack components (Nova, Keystone, etc.) to maintain compatibility; review OpenStack upgrade documentation before proceeding

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ubuntu Linux Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,380
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2014-0187 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data