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OpenStack Neutron Race Condition vulnerability

Moderate severity GitHub Reviewed Published May 13, 2022 to the GitHub Advisory Database • Updated Feb 8, 2023

Package

pip neutron (pip)

Affected versions

< 7.2.0-12.1
>= 8.0.0, < 8.3.0-11.1
>= 9.0.0, < 9.3.1-2.1
>= 10.0.0, < 10.0.2-1.1

Patched versions

7.2.0-12.1
8.3.0-11.1
9.3.1-2.1
10.0.2-1.1

Description

A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

References

Published by the National Vulnerability Database Jul 26, 2018
Published to the GitHub Advisory Database May 13, 2022
Reviewed Feb 8, 2023
Last updated Feb 8, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.314%
(71st percentile)

Weaknesses

CVE ID

CVE-2017-7543

GHSA ID

GHSA-hvxr-2fvv-c3wq

Source code

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