{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2011-4597",
        "ASSIGNER": "secalert@redhat.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "The SIP over UDP implementation in 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."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "n/a",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "n/a",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "n/a"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html",
                "refsource": "MISC",
                "name": "http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html"
            },
            {
                "url": "http://downloads.asterisk.org/pub/security/AST-2011-013.html",
                "refsource": "MISC",
                "name": "http://downloads.asterisk.org/pub/security/AST-2011-013.html"
            },
            {
                "url": "http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html",
                "refsource": "MISC",
                "name": "http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html"
            },
            {
                "url": "http://openwall.com/lists/oss-security/2011/12/09/3",
                "refsource": "MISC",
                "name": "http://openwall.com/lists/oss-security/2011/12/09/3"
            },
            {
                "url": "http://openwall.com/lists/oss-security/2011/12/09/4",
                "refsource": "MISC",
                "name": "http://openwall.com/lists/oss-security/2011/12/09/4"
            },
            {
                "url": "http://osvdb.org/77597",
                "refsource": "MISC",
                "name": "http://osvdb.org/77597"
            },
            {
                "url": "http://secunia.com/advisories/47273",
                "refsource": "MISC",
                "name": "http://secunia.com/advisories/47273"
            },
            {
                "url": "http://www.debian.org/security/2011/dsa-2367",
                "refsource": "MISC",
                "name": "http://www.debian.org/security/2011/dsa-2367"
            }
        ]
    }
}