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Esto tiene al menos dos efectos potenciales: el rendimiento del servidor recurrente puede estar potencialmente afectado por el trabajo adicional requerido para realizar estas recuperaciones, y el atacante puede explotar este comportamiento para utilizar el servidor recurrente como un reflector en un ataque de reflexi\u00f3n con un alto factor de amplificaci\u00f3n"}], "id": "CVE-2020-8616", "lastModified": "2023-11-07T03:26:38.287", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "security-officer@isc.org", "type": "Secondary"}]}, "published": "2020-05-19T14:15:11.877", "references": [{"source": "security-officer@isc.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html"}, {"source": "security-officer@isc.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html"}, {"source": "security-officer@isc.org", "tags": ["Exploit", "Third Party Advisory"], "url": "http://www.nxnsattack.com"}, {"source": "security-officer@isc.org", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2020/05/19/4"}, {"source": "security-officer@isc.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2020-8616"}, {"source": "security-officer@isc.org", "url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/"}, {"source": "security-officer@isc.org", "url": "https://security.netapp.com/advisory/ntap-20200522-0002/"}, {"source": "security-officer@isc.org", "url": "https://usn.ubuntu.com/4365-1/"}, {"source": "security-officer@isc.org", "url": "https://usn.ubuntu.com/4365-2/"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2020/dsa-4689"}, {"source": "security-officer@isc.org", "url": "https://www.synology.com/security/advisory/Synology_SA_20_12"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges Anat Bremler-Barr (Interdisciplinary Center (IDC), Herzliya), and Lior Shafir and Yehuda Afek (Tel Aviv University) as the original reporters.", "affected_release": [{"advisory": "RHSA-2020:2383", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "bind-32:9.8.2-0.68.rc1.el6_10.7", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-06-03T00:00:00Z"}, {"advisory": "RHSA-2020:3379", "cpe": "cpe:/o:redhat:rhel_aus:6.5", "package": "bind-32:9.8.2-0.23.rc1.el6_5.9", "product_name": "Red Hat Enterprise Linux 6.5 Advanced Update Support", "release_date": "2020-08-10T00:00:00Z"}, {"advisory": "RHSA-2020:3378", "cpe": "cpe:/o:redhat:rhel_aus:6.6", "package": "bind-32:9.8.2-0.30.rc1.el6_6.11", "product_name": "Red Hat Enterprise Linux 6.6 Advanced Update Support", "release_date": "2020-08-10T00:00:00Z"}, {"advisory": "RHSA-2020:2344", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "bind-32:9.11.4-16.P2.el7_8.6", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-06-01T00:00:00Z"}, {"advisory": "RHSA-2020:3471", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "bind-32:9.9.4-29.el7_2.9", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2020-08-18T00:00:00Z"}, {"advisory": "RHSA-2020:3470", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "bind-32:9.9.4-50.el7_3.4", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2020-08-18T00:00:00Z"}, {"advisory": "RHSA-2020:3470", "cpe": "cpe:/o:redhat:rhel_tus:7.3", "package": "bind-32:9.9.4-50.el7_3.4", "product_name": "Red Hat Enterprise Linux 7.3 Telco Extended Update Support", "release_date": "2020-08-18T00:00:00Z"}, {"advisory": "RHSA-2020:3470", "cpe": "cpe:/o:redhat:rhel_e4s:7.3", "package": "bind-32:9.9.4-50.el7_3.4", "product_name": "Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions", "release_date": "2020-08-18T00:00:00Z"}, {"advisory": "RHSA-2020:3433", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "bind-32:9.9.4-51.el7_4.4", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2020-08-12T00:00:00Z"}, {"advisory": "RHSA-2020:3433", "cpe": "cpe:/o:redhat:rhel_tus:7.4", "package": "bind-32:9.9.4-51.el7_4.4", "product_name": "Red Hat Enterprise Linux 7.4 Telco Extended Update Support", "release_date": "2020-08-12T00:00:00Z"}, {"advisory": "RHSA-2020:3433", "cpe": "cpe:/o:redhat:rhel_e4s:7.4", "package": "bind-32:9.9.4-51.el7_4.4", "product_name": "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions", "release_date": "2020-08-12T00:00:00Z"}, {"advisory": "RHSA-2020:3475", "cpe": "cpe:/o:redhat:rhel_eus:7.6", "package": "bind-32:9.9.4-74.el7_6.4", "product_name": "Red Hat Enterprise Linux 7.6 Extended Update Support", "release_date": "2020-08-18T00:00:00Z"}, {"advisory": "RHSA-2020:3272", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "bind-32:9.11.4-9.P2.el7_7.2", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2020-08-03T00:00:00Z"}, {"advisory": "RHSA-2020:2338", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "bind-32:9.11.13-5.el8_2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-05-28T00:00:00Z"}, {"advisory": "RHSA-2020:2338", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "bind-32:9.11.13-5.el8_2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-05-28T00:00:00Z"}, {"advisory": "RHSA-2020:2404", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "bind-32:9.11.4-19.P2.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-06-04T00:00:00Z"}, {"advisory": "RHSA-2020:2345", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "bind-32:9.11.4-26.P2.el8_1.3", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-06-01T00:00:00Z"}], "bugzilla": {"description": "bind: BIND does not sufficiently limit the number of fetches performed when processing referrals", "id": "1836118", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1836118"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-400", "details": ["A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.", "A flaw was found in BIND, where it does not sufficiently limit the number of fetches that can be performed while processing a referral response. This flaw allows an attacker to cause a denial of service attack. The attacker can also exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible."}, "name": "CVE-2020-8616", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "bind97", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-05-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-8616\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-8616\nhttps://kb.isc.org/docs/cve-2020-8616\nhttps://www.theregister.co.uk/2020/05/21/nxnaattack_bug_disclosed/"], "threat_severity": "Important", "upstream_fix": "bind 9.11.19, bind 9.14.12, bind 9.16.3"}