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capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers."}, {"lang": "es", "value": "Las capacidades de filtrado de la red de capa 2, como la protecci\u00f3n IPv6 RA o la inspecci\u00f3n ARP, pueden omitirse usando combinaciones de encabezados VLAN 0 y encabezados LLC/SNAP"}], "id": "CVE-2021-27853", "lastModified": "2022-11-16T17:26:33.420", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-09-27T18:15:09.527", "references": [{"source": "cret@cert.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"}, {"source": "cret@cert.org", "tags": ["Technical Description", "Third Party Advisory"], "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"}, {"source": "cret@cert.org", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://kb.cert.org/vuls/id/855201"}, {"source": "cret@cert.org", "tags": ["Vendor Advisory"], "url": "https://standards.ieee.org/ieee/802.1Q/10323/"}, {"source": "cret@cert.org", "tags": ["Vendor Advisory"], "url": "https://standards.ieee.org/ieee/802.2/1048/"}, {"source": "cret@cert.org", "tags": ["Third Party Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-VU855201-J3z8CKTX"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-290"}], "source": "cret@cert.org", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Etienne Champetier for reporting this issue.", "bugzilla": {"description": "kernel: layer 2 network filtering capabilities bypass", "id": "2010795", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2010795"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "details": ["Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers.", "Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers."], "name": "CVE-2021-27853", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-09-27T10:30:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-27853\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-27853"], "statement": "Red Hat deems this to be a configuration issue. There is no vulnerability in the Linux kernel itself, there is a lot of ways to misuse the filtering facilities provided by the kernel and do insecure filtering rules, but you also have everything to actually set up secure rules.", "threat_severity": "Moderate"}