ubuntu-cve-2023-50868
Vulnerability from osv_ubuntu
Published
2024-02-13 00:00
Modified
2026-06-02 19:36
Summary
Details
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
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{
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"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor@4.6.0-1ubuntu1+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.2-3",
"4.6.0-1ubuntu1",
"4.6.0-1ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "isc-dhcp-client",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-client-ddns",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-common",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-keama",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-relay",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server-ldap",
"binary_version": "4.4.3-P1-4ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "isc-dhcp",
"purl": "pkg:deb/ubuntu/isc-dhcp@4.4.3-P1-4ubuntu2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.3-P1-2ubuntu5",
"4.4.3-P1-4ubuntu1",
"4.4.3-P1-4ubuntu2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libunbound8",
"binary_version": "1.19.1-1ubuntu1"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.19.1-1ubuntu1"
},
{
"binary_name": "unbound",
"binary_version": "1.19.1-1ubuntu1"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.19.1-1ubuntu1"
},
{
"binary_name": "unbound-host",
"binary_version": "1.19.1-1ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound@1.19.1-1ubuntu1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.19.1-1ubuntu1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.17.1-2",
"1.18.0-2ubuntu1",
"1.18.0-2ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "isc-dhcp-client",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-client-ddns",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-common",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-keama",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-relay",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server-ldap",
"binary_version": "4.4.3-P1-4ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "isc-dhcp",
"purl": "pkg:deb/ubuntu/isc-dhcp@4.4.3-P1-4ubuntu2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.3-P1-4ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "isc-dhcp-client",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-client-ddns",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-common",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-keama",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-relay",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server",
"binary_version": "4.4.3-P1-4ubuntu2"
},
{
"binary_name": "isc-dhcp-server-ldap",
"binary_version": "4.4.3-P1-4ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "isc-dhcp",
"purl": "pkg:deb/ubuntu/isc-dhcp@4.4.3-P1-4ubuntu2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.4.3-P1-4ubuntu2"
]
}
],
"aliases": [],
"details": "The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the \"NSEC3\" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.",
"id": "UBUNTU-CVE-2023-50868",
"modified": "2026-06-02T19:36:46Z",
"published": "2024-02-13T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-50868"
},
{
"type": "REPORT",
"url": "https://kb.isc.org/docs/cve-2023-50868"
},
{
"type": "REPORT",
"url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html"
},
{
"type": "REPORT",
"url": "https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html"
},
{
"type": "REPORT",
"url": "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released"
},
{
"type": "REPORT",
"url": "https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/"
},
{
"type": "REPORT",
"url": "https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6633-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6642-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6657-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6665-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6723-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-50868"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6657-2"
}
],
"related": [
"USN-6633-1",
"USN-6642-1",
"USN-6657-1",
"USN-6665-1",
"USN-6723-1",
"USN-6657-2"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-50868"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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