CVE-2021-20305

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This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en Nettle en versiones anteriores a 3.7.2, donde varias funciones de comprobaci\u00f3n de firma de Nettle (GOST DSA, EDDSA y ECDSA) resultan en la funci\u00f3n de multiplicaci\u00f3n del punto Elliptic Curve Cryptography (ECC) ser llamados con escaladores fuera de rango, posiblemente resultando en resultados incorrectos. Este fallo permite a un atacante forzar una firma no v\u00e1lida, causando un fallo de aserci\u00f3n o una posible validaci\u00f3n. La mayor amenaza para esta vulnerabilidad es la confidencialidad, la integridad y la disponibilidad del sistema"}], "id": "CVE-2021-20305", "lastModified": "2026-10-14T11:16:51.937", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-04-05T22:15:12.727", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1942533"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html"}, {"source": "secalert@redhat.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202105-31"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20211022-0002/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4933"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1942533"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202105-31"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20211022-0002/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4933"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-327"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Niels M\u00f6ller for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:1145", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "nettle-0:2.7.1-9.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-04-08T00:00:00Z"}, {"advisory": "RHSA-2021:2760", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "nettle-0:2.7.1-9.el7_3", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2021-07-19T00:00:00Z"}, {"advisory": "RHSA-2021:2758", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "nettle-0:2.7.1-9.el7_4", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2021-07-15T00:00:00Z"}, {"advisory": "RHSA-2021:2758", "cpe": "cpe:/o:redhat:rhel_tus:7.4", "package": "nettle-0:2.7.1-9.el7_4", "product_name": "Red Hat Enterprise Linux 7.4 Telco Extended Update Support", "release_date": "2021-07-15T00:00:00Z"}, {"advisory": "RHSA-2021:2758", "cpe": "cpe:/o:redhat:rhel_e4s:7.4", "package": "nettle-0:2.7.1-9.el7_4", "product_name": "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions", "release_date": "2021-07-15T00:00:00Z"}, {"advisory": "RHSA-2021:2356", "cpe": "cpe:/o:redhat:rhel_aus:7.6", "package": "nettle-0:2.7.1-9.el7_6", "product_name": "Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)", "release_date": "2021-06-09T00:00:00Z"}, {"advisory": "RHSA-2021:2356", "cpe": "cpe:/o:redhat:rhel_tus:7.6", "package": "nettle-0:2.7.1-9.el7_6", "product_name": "Red Hat Enterprise Linux 7.6 Telco Extended Update Support", "release_date": "2021-06-09T00:00:00Z"}, {"advisory": "RHSA-2021:2356", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "nettle-0:2.7.1-9.el7_6", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2021-06-09T00:00:00Z"}, {"advisory": "RHSA-2021:2280", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "nettle-0:2.7.1-9.el7_7", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2021-06-07T00:00:00Z"}, {"advisory": "RHSA-2021:1206", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "gnutls-0:3.6.14-8.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1206", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "nettle-0:3.4.1-4.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1206", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "gnutls-0:3.6.14-8.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1206", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "nettle-0:3.4.1-4.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1245", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "gnutls-0:3.6.8-10.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-19T00:00:00Z"}, {"advisory": "RHSA-2021:1245", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "nettle-0:3.4.1-2.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-19T00:00:00Z"}, {"advisory": "RHSA-2021:1246", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "gnutls-0:3.6.8-12.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-19T00:00:00Z"}, {"advisory": "RHSA-2021:1246", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "nettle-0:3.4.1-2.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-19T00:00:00Z"}], "bugzilla": {"description": "nettle: Out of bounds memory access in signature verification", "id": "1942533", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1942533"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-787", "details": ["A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.", "A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability."], "name": "CVE-2021-20305", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "nettle", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Not affected", "package_name": "nettle", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Not affected", "package_name": "nettle", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16.1", "fix_state": "Not affected", "package_name": "nettle", "product_name": "Red Hat OpenStack Platform 16.1"}], "public_date": "2021-03-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-20305\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20305\nhttps://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009457.html"], "statement": "* Although Red Hat OpenStack's dibbler package bundles nettle, it does not include the flawed functionality and is therefore unaffected.", "threat_severity": "Important"}

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