RHSA-2017:2452

Vulnerability from csaf_redhat - Published: 2017-08-08 22:50 - Updated: 2025-11-21 18:01
Summary
Red Hat Security Advisory: openstack-neutron security update
Severity
Important
Notes
Topic: An update for openstack-neutron is now available for Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: OpenStack Networking (neutron) is a pluggable, scalable, and API-driven system that provisions networking services to virtual machines. Its main function is to manage connectivity to and from virtual machines. Security Fix(es): * A race-condition flaw was discovered in openstack-neutron 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. (CVE-2017-7543) This issue was discovered by Paul Needle (Red Hat).
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2017-7543

A race-condition flaw was discovered in openstack-neutron 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.

5.3 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2017:2452
Workaround To determine whether your system is impacted, run: $ sudo sysctl net.bridge.bridge-nf-call-ip6tables $ sudo sysctl net.bridge.bridge-nf-call-iptables Both should be set to 1 To reset security groups to '1': 1. Apply the following configuration modification: $ sudo sed -i.back -e 's/reapply_sysctl = 0/reapply_sysctl = 1/' /etc/tuned/tuned-main.conf 2. Ensure the modification was successful: $ grep reapply_sysctl /etc/tuned/tuned-main.conf should be "reapply_sysctl = 1" 3. Check whether tuned is running: $ sudo systemctl status tuned 4. Restart tuned to apply the new configuration: $ sudo systemctl restart tuned 5. Recheck your security groups and the status of 'reapply_sysctl'.
References
Acknowledgments
Red Hat Paul Needle
To clipboard 

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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "openstack-neutron: iptables not active after update",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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            "7Server-RH7-RHOS-6.0:python-neutron-0:2014.2.3-42.el7ost.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2017:2452"
        },
        {
          "category": "workaround",
          "details": "To determine whether your system is impacted, run:\n$ sudo sysctl net.bridge.bridge-nf-call-ip6tables \n$ sudo sysctl net.bridge.bridge-nf-call-iptables\nBoth should be set to 1\n\nTo reset security groups to \u00271\u0027:\n1. Apply the following configuration modification:\n$ sudo sed -i.back -e \u0027s/reapply_sysctl = 0/reapply_sysctl = 1/\u0027 /etc/tuned/tuned-main.conf\n\n2. Ensure the modification was successful:\n$ grep reapply_sysctl /etc/tuned/tuned-main.conf\nshould be \"reapply_sysctl = 1\"\n\n3. Check whether tuned is running:\n$ sudo systemctl status tuned\n\n4. Restart tuned to apply the new configuration:\n$ sudo systemctl restart tuned\n\n5. Recheck your security groups and the status of \u0027reapply_sysctl\u0027.",
          "product_ids": [
            "7Server-RH7-RHOS-6.0:openstack-neutron-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-0:2014.2.3-42.el7ost.src",
            "7Server-RH7-RHOS-6.0:openstack-neutron-bigswitch-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-brocade-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-cisco-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-common-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-embrane-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-hyperv-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ibm-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-linuxbridge-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-mellanox-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-metaplugin-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-metering-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-midonet-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ml2-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-nec-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-nuage-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ofagent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-oneconvergence-nvsd-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-opencontrail-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-openvswitch-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-plumgrid-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ryu-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-sriov-nic-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-vmware-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-vpn-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:python-neutron-0:2014.2.3-42.el7ost.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.0"
          },
          "products": [
            "7Server-RH7-RHOS-6.0:openstack-neutron-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-0:2014.2.3-42.el7ost.src",
            "7Server-RH7-RHOS-6.0:openstack-neutron-bigswitch-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-brocade-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-cisco-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-common-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-embrane-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-hyperv-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ibm-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-linuxbridge-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-mellanox-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-metaplugin-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-metering-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-midonet-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ml2-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-nec-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-nuage-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ofagent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-oneconvergence-nvsd-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-opencontrail-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-openvswitch-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-plumgrid-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-ryu-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-sriov-nic-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-vmware-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:openstack-neutron-vpn-agent-0:2014.2.3-42.el7ost.noarch",
            "7Server-RH7-RHOS-6.0:python-neutron-0:2014.2.3-42.el7ost.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "openstack-neutron: iptables not active after update"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.