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Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests."}, {"lang": "es", "value": "La implementaci\u00f3n de SIP sobre UDP de Asterisk Open Source 1.4.x anteriores a 1.4.43, 1.6.x anteriores a 1.6.2.21, y 1.8.x anteriores a 1.8.7.2 utiliza diferentes n\u00fameros de puertos para respuestas a peticiones inv\u00e1lidas dependiendo de si el nombre de usuario SIP existe, lo que permite a atacantes remotos enumerar nombres de usuario a trav\u00e9s de series de peticiones."}], "id": "CVE-2011-4597", "lastModified": "2026-06-16T23:35:06.857", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}]}, "published": "2011-12-15T03:57:34.310", "references": [{"source": "secalert@redhat.com", "url": "http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html"}, {"source": "secalert@redhat.com", "url": "http://downloads.asterisk.org/pub/security/AST-2011-013.html"}, {"source": "secalert@redhat.com", "url": "http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html"}, {"source": "secalert@redhat.com", "url": "http://openwall.com/lists/oss-security/2011/12/09/3"}, {"source": "secalert@redhat.com", "url": "http://openwall.com/lists/oss-security/2011/12/09/4"}, {"source": "secalert@redhat.com", "url": "http://osvdb.org/77597"}, {"source": "secalert@redhat.com", "url": "http://secunia.com/advisories/47273"}, {"source": "secalert@redhat.com", "url": "http://www.debian.org/security/2011/dsa-2367"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://downloads.asterisk.org/pub/security/AST-2011-013.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://openwall.com/lists/oss-security/2011/12/09/3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://openwall.com/lists/oss-security/2011/12/09/4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://osvdb.org/77597"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://secunia.com/advisories/47273"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.debian.org/security/2011/dsa-2367"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

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