CVE-2016-8635

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An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group."}, {"lang": "es", "value": "Se ha descubierto que el manejo del intercambio de claves de cliente Diffie Hellman en NSS 3.21.x era vulnerable a un ataque de confinamiento de subgrupo peque\u00f1o. Un atacante podr\u00eda emplear este error para recuperar claves privadas confinando la clave DH del cliente en un subgrupo peque\u00f1o del grupo deseado."}], "id": "CVE-2016-8635", "lastModified": "2026-06-17T00:54:39.220", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-08-01T13:29:00.217", "references": [{"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "http://rhn.redhat.com/errata/RHSA-2016-2779.html"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/94346"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8635"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/201701-46"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://rhn.redhat.com/errata/RHSA-2016-2779.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/94346"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8635"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/201701-46"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-358"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-320"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "This issue was discovered by Hubert Kario (Red Hat).", "affected_release": [{"advisory": "RHSA-2016:2779", "cpe": "cpe:/o:redhat:enterprise_linux:5", "package": "nss-0:3.21.3-2.el5_11", "product_name": "Red Hat Enterprise Linux 5", "release_date": "2016-11-16T00:00:00Z"}, {"advisory": "RHSA-2016:2779", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "nss-0:3.21.3-2.el6_8", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-11-16T00:00:00Z"}, {"advisory": "RHSA-2016:2779", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "nss-util-0:3.21.3-1.el6_8", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-11-16T00:00:00Z"}, {"advisory": "RHSA-2016:2779", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "nss-0:3.21.3-2.el7_3", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-11-16T00:00:00Z"}, {"advisory": "RHSA-2016:2779", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "nss-util-0:3.21.3-1.1.el7_3", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-11-16T00:00:00Z"}], "bugzilla": {"description": "nss: small-subgroups attack flaw", "id": "1391818", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1391818"}, "csaw": false, "cvss": {"cvss_base_score": "4.3", "cvss_scoring_vector": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "status": "verified"}, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "verified"}, "details": ["It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.", "It was found that Diffie Hellman Client key exchange handling in NSS was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group."], "name": "CVE-2016-8635", "public_date": "2016-11-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-8635\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-8635"], "threat_severity": "Moderate"}

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