{
    "CVE_data_meta": {
        "ASSIGNER": "security-officer@isc.org",
        "DATE_PUBLIC": "2018-02-28T00:00:00.000Z",
        "ID": "CVE-2018-5733",
        "STATE": "PUBLIC",
        "TITLE": "A malicious client can overflow a reference counter in ISC dhcpd"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "ISC DHCP",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_name": "ISC DHCP",
                                            "version_value": "4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "ISC"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "ISC would like to thank Felix Wilhelm, Google Security Team, for reporting this vulnerability."
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.0"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Successful exploitation of this vulnerability may exhaust the memory available to dhcpd and/or cause it to crash, resulting in a denial of service to clients."
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://kb.isc.org/docs/aa-01567",
                "refsource": "CONFIRM",
                "url": "https://kb.isc.org/docs/aa-01567"
            },
            {
                "name": "RHSA-2018:0469",
                "refsource": "REDHAT",
                "url": "https://access.redhat.com/errata/RHSA-2018:0469"
            },
            {
                "name": "DSA-4133",
                "refsource": "DEBIAN",
                "url": "https://www.debian.org/security/2018/dsa-4133"
            },
            {
                "name": "USN-3586-2",
                "refsource": "UBUNTU",
                "url": "https://usn.ubuntu.com/3586-2/"
            },
            {
                "name": "RHSA-2018:0483",
                "refsource": "REDHAT",
                "url": "https://access.redhat.com/errata/RHSA-2018:0483"
            },
            {
                "name": "USN-3586-1",
                "refsource": "UBUNTU",
                "url": "https://usn.ubuntu.com/3586-1/"
            },
            {
                "name": "103188",
                "refsource": "BID",
                "url": "http://www.securityfocus.com/bid/103188"
            },
            {
                "name": "1040437",
                "refsource": "SECTRACK",
                "url": "http://www.securitytracker.com/id/1040437"
            },
            {
                "name": "[debian-lts-announce] 20180322 [SECURITY] [DLA 1313-1] isc-dhcp security update",
                "refsource": "MLIST",
                "url": "https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html"
            }
        ]
    },
    "solution": [
        {
            "lang": "eng",
            "value": "Upgrade to the patched release most closely related to your current version of DHCP.\n\n    DHCP 4.1-ESV-R15-P1\n    DHCP 4.3.6-P1\n    DHCP 4.4.1"
        }
    ],
    "source": {
        "discovery": "EXTERNAL"
    }
}