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USN-6657-1 (UBUNTU-CVE-2023-28450)
Vulnerability from osv_ubuntu – Published: 2024-02-26 13:52 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
dnsmasq vulnerabilities
Details
Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Dnsmasq icorrectly handled validating DNSSEC messages. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of service. (CVE-2023-50387)
It was discovered that Dnsmasq incorrectly handled preparing an NSEC3 closest encloser proof. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of service. (CVE-2023-50868)
It was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP packet size as required by DNS Flag Day 2020. This issue only affected Ubuntu 23.10. (CVE-2023-28450)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2023-50387",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"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"
}
]
},
{
"id": "CVE-2023-50868",
"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"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.90-0ubuntu0.20.04.1"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.90-0ubuntu0.20.04.1"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.90-0ubuntu0.20.04.1"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.90-0ubuntu0.20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.90-0ubuntu0.20.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.80-1ubuntu2",
"2.80-1ubuntu4",
"2.80-1.1ubuntu1",
"2.80-1.1ubuntu1.2",
"2.80-1.1ubuntu1.3",
"2.80-1.1ubuntu1.4",
"2.80-1.1ubuntu1.5",
"2.80-1.1ubuntu1.6",
"2.80-1.1ubuntu1.7"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2023-50387",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"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"
}
]
},
{
"id": "CVE-2023-50868",
"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"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.90-0ubuntu0.22.04.1"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.90-0ubuntu0.22.04.1"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.90-0ubuntu0.22.04.1"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.90-0ubuntu0.22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.90-0ubuntu0.22.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.85-1ubuntu2",
"2.86-1.1",
"2.86-1.1ubuntu0.1",
"2.86-1.1ubuntu0.2",
"2.86-1.1ubuntu0.3",
"2.86-1.1ubuntu0.4",
"2.86-1.1ubuntu0.5"
]
}
],
"aliases": [],
"details": "Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered\nthat Dnsmasq icorrectly handled validating DNSSEC messages. A remote\nattacker could possibly use this issue to cause Dnsmasq to consume\nresources, leading to a denial of service. (CVE-2023-50387)\n\nIt was discovered that Dnsmasq incorrectly handled preparing an NSEC3\nclosest encloser proof. A remote attacker could possibly use this issue to\ncause Dnsmasq to consume resources, leading to a denial of service.\n(CVE-2023-50868)\n\nIt was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP\npacket size as required by DNS Flag Day 2020. This issue only affected\nUbuntu 23.10. (CVE-2023-28450)\n",
"id": "USN-6657-1",
"modified": "2026-04-27T14:11:32Z",
"published": "2024-02-26T13:52:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6657-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-28450"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-50387"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-50868"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "dnsmasq vulnerabilities",
"upstream": [
"UBUNTU-CVE-2023-28450",
"UBUNTU-CVE-2023-50387",
"UBUNTU-CVE-2023-50868"
]
}
UBUNTU-CVE-2023-28450 (CVE-2023-28450)
Vulnerability from osv_ubuntu – Published: 2023-03-15 21:15 – Updated: 2025-07-16 05:09 – Source website
VLAI
Details
An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.68-1ubuntu0.2+esm2"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.68-1ubuntu0.2+esm2"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.68-1ubuntu0.2+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.68-1ubuntu0.2+esm2?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.68-1ubuntu0.2+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.66-4ubuntu1",
"2.67-1",
"2.68-1",
"2.68-1ubuntu0.1",
"2.68-1ubuntu0.2",
"2.68-1ubuntu0.2+esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.79-1ubuntu0.16.04.1+esm2"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.79-1ubuntu0.16.04.1+esm2"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.79-1ubuntu0.16.04.1+esm2"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.79-1ubuntu0.16.04.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.16.04.1+esm2?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.79-1ubuntu0.16.04.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.75-1",
"2.75-1ubuntu0.16.04.1",
"2.75-1ubuntu0.16.04.2",
"2.75-1ubuntu0.16.04.3",
"2.75-1ubuntu0.16.04.4",
"2.75-1ubuntu0.16.04.5",
"2.75-1ubuntu0.16.04.7",
"2.75-1ubuntu0.16.04.8",
"2.75-1ubuntu0.16.04.10",
"2.75-1ubuntu0.16.04.10+esm1",
"2.79-1ubuntu0.16.04.1+esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.79-1ubuntu0.7"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.79-1ubuntu0.7"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.79-1ubuntu0.7"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.79-1ubuntu0.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.7?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.79-1ubuntu0.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.78-1",
"2.78-3",
"2.79-1",
"2.79-1ubuntu0.2",
"2.79-1ubuntu0.3",
"2.79-1ubuntu0.4",
"2.79-1ubuntu0.5",
"2.79-1ubuntu0.6"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.80-1.1ubuntu1.7"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.80-1.1ubuntu1.7"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.80-1.1ubuntu1.7"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.80-1.1ubuntu1.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.80-1.1ubuntu1.7?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.80-1.1ubuntu1.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.80-1ubuntu2",
"2.80-1ubuntu4",
"2.80-1.1ubuntu1",
"2.80-1.1ubuntu1.2",
"2.80-1.1ubuntu1.3",
"2.80-1.1ubuntu1.4",
"2.80-1.1ubuntu1.5",
"2.80-1.1ubuntu1.6"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dnsmasq",
"binary_version": "2.86-1.1ubuntu0.3"
},
{
"binary_name": "dnsmasq-base",
"binary_version": "2.86-1.1ubuntu0.3"
},
{
"binary_name": "dnsmasq-base-lua",
"binary_version": "2.86-1.1ubuntu0.3"
},
{
"binary_name": "dnsmasq-utils",
"binary_version": "2.86-1.1ubuntu0.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "dnsmasq",
"purl": "pkg:deb/ubuntu/dnsmasq@2.86-1.1ubuntu0.3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.86-1.1ubuntu0.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.85-1ubuntu2",
"2.86-1.1",
"2.86-1.1ubuntu0.1",
"2.86-1.1ubuntu0.2"
]
}
],
"aliases": [],
"details": "An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.",
"id": "UBUNTU-CVE-2023-28450",
"modified": "2025-07-16T05:09:19Z",
"published": "2023-03-15T21:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-28450"
},
{
"type": "REPORT",
"url": "https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=CHANGELOG"
},
{
"type": "REPORT",
"url": "https://capec.mitre.org/data/definitions/495.html"
},
{
"type": "REPORT",
"url": "https://thekelleys.org.uk/dnsmasq/doc.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6034-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6657-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-28450"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6657-2"
}
],
"related": [
"USN-6034-1",
"USN-6657-1",
"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:N/A:H",
"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": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-28450"
]
}
UBUNTU-CVE-2023-50387 (CVE-2023-50387)
Vulnerability from osv_ubuntu – Published: 2024-02-13 00:00 – Updated: 2026-06-02 19:36 – Source website
VLAI
Details
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
| URL | Type | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "bind9",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "bind9-host",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "bind9utils",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "dnsutils",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "host",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "libbind9-90",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "libdns100",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "libisc95",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "libisccc90",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "libisccfg90",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "liblwres90",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
},
{
"binary_name": "lwresd",
"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "bind9",
"purl": "pkg:deb/ubuntu/bind9@1:9.9.5.dfsg-3ubuntu0.19+esm12?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.9.5.dfsg-3ubuntu0.19+esm12"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:9.9.3.dfsg.P2-4ubuntu1",
"1:9.9.3.dfsg.P2-4ubuntu2",
"1:9.9.3.dfsg.P2-4ubuntu3",
"1:9.9.5.dfsg-2",
"1:9.9.5.dfsg-3",
"1:9.9.5.dfsg-3ubuntu0.1",
"1:9.9.5.dfsg-3ubuntu0.2",
"1:9.9.5.dfsg-3ubuntu0.3",
"1:9.9.5.dfsg-3ubuntu0.4",
"1:9.9.5.dfsg-3ubuntu0.5",
"1:9.9.5.dfsg-3ubuntu0.6",
"1:9.9.5.dfsg-3ubuntu0.7",
"1:9.9.5.dfsg-3ubuntu0.8",
"1:9.9.5.dfsg-3ubuntu0.9",
"1:9.9.5.dfsg-3ubuntu0.10",
"1:9.9.5.dfsg-3ubuntu0.11",
"1:9.9.5.dfsg-3ubuntu0.12",
"1:9.9.5.dfsg-3ubuntu0.13",
"1:9.9.5.dfsg-3ubuntu0.14",
"1:9.9.5.dfsg-3ubuntu0.15",
"1:9.9.5.dfsg-3ubuntu0.16",
"1:9.9.5.dfsg-3ubuntu0.17",
"1:9.9.5.dfsg-3ubuntu0.18",
"1:9.9.5.dfsg-3ubuntu0.19",
"1:9.9.5.dfsg-3ubuntu0.19+esm1",
"1:9.9.5.dfsg-3ubuntu0.19+esm2",
"1:9.9.5.dfsg-3ubuntu0.19+esm3",
"1:9.9.5.dfsg-3ubuntu0.19+esm4",
"1:9.9.5.dfsg-3ubuntu0.19+esm5",
"1:9.9.5.dfsg-3ubuntu0.19+esm6",
"1:9.9.5.dfsg-3ubuntu0.19+esm7",
"1:9.9.5.dfsg-3ubuntu0.19+esm9",
"1:9.9.5.dfsg-3ubuntu0.19+esm10",
"1:9.9.5.dfsg-3ubuntu0.19+esm11"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm3"
},
{
"binary_name": "python-unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm3"
},
{
"binary_name": "unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm3"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm3"
},
{
"binary_name": "unbound-host",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound@1.4.22-1ubuntu4.14.04.3+esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.20-1",
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"details": "Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \"KeyTrap\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.",
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{
"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-2023-50387"
},
{
"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:N/A:H",
"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-2023-50387"
]
}
UBUNTU-CVE-2023-50868 (CVE-2023-50868)
Vulnerability from osv_ubuntu – Published: 2024-02-13 00:00 – Updated: 2026-06-02 19:36 – Source website
VLAI
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
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|
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{
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"binary_version": "1.13.1-1ubuntu5.4"
},
{
"binary_name": "unbound-host",
"binary_version": "1.13.1-1ubuntu5.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound@1.13.1-1ubuntu5.4?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.13.1-1ubuntu5.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.13.1-1ubuntu1",
"1.13.1-1ubuntu3",
"1.13.1-1ubuntu5",
"1.13.1-1ubuntu5.1",
"1.13.1-1ubuntu5.2",
"1.13.1-1ubuntu5.3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "knot-resolver",
"binary_version": "5.4.4-1ubuntu0.1~esm1"
},
{
"binary_name": "knot-resolver-module-http",
"binary_version": "5.4.4-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "knot-resolver",
"purl": "pkg:deb/ubuntu/knot-resolver@5.4.4-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.3.1-1",
"5.4.2-1",
"5.4.3-1",
"5.4.4-1",
"5.4.4-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.6.0-1ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"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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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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