USN-6657-2

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Source
https://ubuntu.com/security/notices/USN-6657-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6657-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-6657-2
Upstream
Related
Published
2024-04-24T19:55:01.148553Z
Modified
2025-10-13T04:36:47Z
Summary
dnsmasq vulnerabilities
Details

USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory 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 packages

Ubuntu:Pro:16.04:LTS / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.16.04.1+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.90-0ubuntu0.16.04.1+esm1

Affected versions

2.*

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
2.79-1ubuntu0.16.04.1+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "2.90-0ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq"
        },
        {
            "binary_version": "2.90-0ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-base"
        },
        {
            "binary_version": "2.90-0ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-base-lua"
        },
        {
            "binary_version": "2.90-0ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-utils"
        }
    ]
}

Database specific 

{
    "cves_map": {
        "cves": [
            {
                "severity": [
                    {
                        "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": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                    },
                    {
                        "type": "Ubuntu",
                        "score": "medium"
                    }
                ],
                "id": "CVE-2023-50387"
            },
            {
                "severity": [
                    {
                        "type": "CVSS_V3",
                        "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
                    },
                    {
                        "type": "Ubuntu",
                        "score": "medium"
                    }
                ],
                "id": "CVE-2023-50868"
            }
        ],
        "ecosystem": "Ubuntu:Pro:16.04:LTS"
    }
}

Ubuntu:Pro:18.04:LTS / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/ubuntu/dnsmasq@2.90-0ubuntu0.18.04.1+esm1?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.90-0ubuntu0.18.04.1+esm1

Affected versions

2.*

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
2.79-1ubuntu0.7

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1",
            "binary_name": "dnsmasq"
        },
        {
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1",
            "binary_name": "dnsmasq-base"
        },
        {
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1",
            "binary_name": "dnsmasq-base-lua"
        },
        {
            "binary_version": "2.90-0ubuntu0.18.04.1+esm1",
            "binary_name": "dnsmasq-utils"
        }
    ]
}

Database specific 

{
    "cves_map": {
        "cves": [
            {
                "severity": [
                    {
                        "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": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                    },
                    {
                        "type": "Ubuntu",
                        "score": "medium"
                    }
                ],
                "id": "CVE-2023-50387"
            },
            {
                "severity": [
                    {
                        "type": "CVSS_V3",
                        "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
                    },
                    {
                        "type": "Ubuntu",
                        "score": "medium"
                    }
                ],
                "id": "CVE-2023-50868"
            }
        ],
        "ecosystem": "Ubuntu:Pro:18.04:LTS"
    }
}