{
    "data_type": "CVE",
    "data_format": "MITRE",
    "data_version": "4.0",
    "CVE_data_meta": {
        "DATE_PUBLIC": "2022-09-21T09:39:29.000Z",
        "ID": "CVE-2022-2795",
        "ASSIGNER": "security-officer@isc.org",
        "STATE": "PUBLIC",
        "TITLE": "Processing large delegations may severely degrade resolver performance"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "BIND9",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_name": "Open Source Branches 9.0 through 9.16",
                                            "version_value": "9.0.0 through versions before 9.16.33"
                                        },
                                        {
                                            "version_name": "Open Source Branch 9.18",
                                            "version_value": "9.18.0 through versions before 9.18.7"
                                        },
                                        {
                                            "version_name": "Supported Preview Branches 9.9-S through 9.11-S",
                                            "version_value": "9.9.3-S1 through versions up to and including 9.11.37-S1"
                                        },
                                        {
                                            "version_name": "Supported Preview Branch 9.16-S",
                                            "version_value": "9.16.8-S1 through versions before 9.16.33-S1"
                                        },
                                        {
                                            "version_name": "Development Branch 9.19",
                                            "version_value": "9.19.0 through versions before 9.19.5"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "ISC"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "ISC would like to thank Yehuda Afek from Tel-Aviv University and Anat Bremler-Barr & Shani Stajnrod from Reichman University for bringing this vulnerability to our attention."
        }
    ],
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service."
            }
        ]
    },
    "exploit": [
        {
            "lang": "eng",
            "value": "We are not aware of any active exploits."
        }
    ],
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "In BIND 9.0.0 -> 9.16.32, 9.18.0 -> 9.18.6, versions 9.9.3-S1 -> 9.11.37-S1, 9.16.8-S1 -> 9.16.32-S1 of the BIND Supported Preview Edition, and versions 9.19.0 -> 9.19.4 of the BIND 9.19 development branch, a flaw in resolver code can cause named to spend excessive amounts of time on processing large delegations."
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://kb.isc.org/docs/cve-2022-2795",
                "refsource": "CONFIRM",
                "url": "https://kb.isc.org/docs/cve-2022-2795"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20220921 ISC has disclosed six vulnerabilities in BIND (CVE-2022-2795, CVE-2022-2881, CVE-2022-2906, CVE-2022-3080, CVE-2022-38177, CVE-2022-38178)",
                "url": "http://www.openwall.com/lists/oss-security/2022/09/21/3"
            },
            {
                "refsource": "DEBIAN",
                "name": "DSA-5235",
                "url": "https://www.debian.org/security/2022/dsa-5235"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-ef038365de",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CV4GQWBPF7Y52J2FA24U6UMHQAOXZEF7/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-8268735e06",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MRHB6J4Z7BKH4HPEKG5D35QGRD6ANNMT/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2022-b197d64471",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YZJQNUASODNVAWZV6STKG5SD6XIJ446S/"
            },
            {
                "refsource": "MLIST",
                "name": "[debian-lts-announce] 20221005 [SECURITY] [DLA 3138-1] bind9 security update",
                "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00007.html"
            },
            {
                "refsource": "GENTOO",
                "name": "GLSA-202210-25",
                "url": "https://security.gentoo.org/glsa/202210-25"
            }
        ]
    },
    "solution": [
        {
            "lang": "eng",
            "value": "Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.33, BIND 9.18.7, BIND 9.19.5, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.16.33-S1."
        }
    ],
    "source": {
        "discovery": "EXTERNAL"
    },
    "work_around": [
        {
            "lang": "eng",
            "value": "No workarounds known."
        }
    ]
}