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In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6."}, {"lang": "es", "value": "Asterisk es un conjunto de herramientas de telefon\u00eda y centralita privada de c\u00f3digo abierto. En Asterisk anteriores a las versiones 18.20.1, 20.5.1 y 21.0.1; as\u00ed como certificado-asterisco anterior a 18.9-cert6; Asterisk es susceptible a un DoS debido a una condici\u00f3n de ejecuci\u00f3n en la fase \"hello handshake\" del protocolo DTLS cuando maneja DTLS-SRTP para la configuraci\u00f3n de medios. Este ataque se puede realizar de forma continua, negando as\u00ed nuevas llamadas cifradas DTLS-SRTP durante el ataque. El abuso de esta vulnerabilidad puede provocar una denegaci\u00f3n de servicio masiva en servidores Asterisk vulnerables para llamadas que dependen de DTLS-SRTP. El commit d7d7764cb07c8a1872804321302ef93bf62cba05 contiene una soluci\u00f3n, que forma parte de las versiones 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6."}], "id": "CVE-2023-49786", "lastModified": "2024-11-21T08:33:50.533", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2023-12-14T20:15:52.927", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2023/Dec/24"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2023/12/15/7"}, {"source": "security-advisories@github.com", "tags": ["Exploit"], "url": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq"}, {"source": "security-advisories@github.com", "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2023/Dec/24"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2023/12/15/7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit"], "url": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-703"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}