{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for openstack-neutron is now available for Red Hat OpenStack\nPlatform 16.2 (Train).\n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "Neutron is a virtual network service for OpenStack. Just like OpenStack\nNova provides an API to dynamically request and configure virtual\nservers, Neutron provides an API to dynamically request and configure\nvirtual networks. These networks connect \"interfaces\" from other\nOpenStack services (e.g., virtual NICs from Nova VMs). The Neutron\nAPI supports extensions to provide advanced network capabilities\n(e.g., QoS, ACLs, network, monitoring, etc.).\n\nSecurity Fix(es):\n\n* arbitrary dnsmasq reconfiguration via extra_dhcp_opts (CVE-2021-40085)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage listed in the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "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.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2021:3488", "url": "https://access.redhat.com/errata/RHSA-2021:3488" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1916701", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1916701" }, { "category": "external", "summary": "1929829", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1929829" }, { "category": "external", "summary": "1938966", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1938966" }, { "category": "external", "summary": "1970051", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1970051" }, { "category": "external", "summary": "1979572", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1979572" }, { "category": "external", "summary": "1998052", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998052" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3488.json" } ], "title": "Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (openstack-neutron) security update", "tracking": { "current_release_date": "2026-06-28T12:34:59+00:00", "generator": { "date": "2026-06-28T12:34:59+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:3488", "initial_release_date": 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"relates_to_product_reference": "8Base-RHOS-16.2" }, { "category": "default_component_of", "full_product_name": { "name": "openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch as a component of Red Hat OpenStack Platform 16.2", "product_id": "8Base-RHOS-16.2:openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch" }, "product_reference": "openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch", "relates_to_product_reference": "8Base-RHOS-16.2" }, { "category": "default_component_of", "full_product_name": { "name": "openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch as a component of Red Hat OpenStack Platform 16.2", "product_id": "8Base-RHOS-16.2:openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch" }, "product_reference": "openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch", "relates_to_product_reference": "8Base-RHOS-16.2" }, { "category": "default_component_of", "full_product_name": { "name": "openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch as a component of Red Hat OpenStack Platform 16.2", "product_id": "8Base-RHOS-16.2:openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch" }, "product_reference": "openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "relates_to_product_reference": "8Base-RHOS-16.2" }, { "category": "default_component_of", "full_product_name": { "name": "python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch as a component of Red Hat OpenStack Platform 16.2", "product_id": "8Base-RHOS-16.2:python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch" }, "product_reference": "python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch", "relates_to_product_reference": "8Base-RHOS-16.2" } ] }, "vulnerabilities": [ { "acknowledgments": [ { "names": [ "the OpenStack project" ] } ], "cve": "CVE-2021-40085", "cwe": { "id": "CWE-20", "name": "Improper Input Validation" }, "discovery_date": "2021-08-26T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1998052" } ], "notes": [ { "category": "description", "text": "An input-validation flaw was found in openstack-neutron, where an authenticated attacker could change the dnsmasq configuration. By crafting extra_dhcp_opts values, the attacker could crash the dnsmasq, change parameters for tenants sharing the same interface, or otherwise alter that daemon’s behavior. This flaw might also be used to trigger a configuration parsing buffer overflow in versions of dnsmasq prior to 2.81. The highest threat from this vulnerability is to system availability, but also threatens data confidentiality and integrity.", "title": "Vulnerability description" }, { "category": "summary", "text": "openstack-neutron: arbitrary dnsmasq reconfiguration via extra_dhcp_opts", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.src", "8Base-RHOS-16.2:openstack-neutron-common-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-linuxbridge-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-macvtap-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-metering-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-ml2-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2021-40085" }, { "category": "external", "summary": "RHBZ#1998052", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1998052" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2021-40085", "url": "https://www.cve.org/CVERecord?id=CVE-2021-40085" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-40085", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40085" }, { "category": "external", "summary": "https://security.openstack.org/ossa/OSSA-2021-005.html", "url": "https://security.openstack.org/ossa/OSSA-2021-005.html" } ], "release_date": "2021-08-31T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2021-09-15T13:40:58+00:00", "details": "For details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.src", "8Base-RHOS-16.2:openstack-neutron-common-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-linuxbridge-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-macvtap-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-metering-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-ml2-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2021:3488" }, { "category": "workaround", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.", "product_ids": [ "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.src", "8Base-RHOS-16.2:openstack-neutron-common-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-linuxbridge-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-macvtap-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-metering-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-ml2-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "version": "3.1" }, "products": [ "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3.src", "8Base-RHOS-16.2:openstack-neutron-common-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-linuxbridge-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-macvtap-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-metering-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-ml2-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-openvswitch-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-rpc-server-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:openstack-neutron-sriov-nic-agent-1:15.3.5-2.20210608154813.el8ost.3.noarch", "8Base-RHOS-16.2:python3-neutron-1:15.3.5-2.20210608154813.el8ost.3.noarch" ] } ], "threats": [ { "category": "impact", "details": "Important" } ], "title": "openstack-neutron: arbitrary dnsmasq reconfiguration via extra_dhcp_opts" } ] }