USN-4976-2

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Source
https://ubuntu.com/security/notices/USN-4976-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4976-2.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4976-2
Upstream
Related
Published
2022-09-07T15:22:39.782683Z
Modified
2025-12-05T10:27:10.445309Z
Summary
dnsmasq vulnerability
Details

USN-4976-1 fixed a vulnerability in Dnsmasq. This update provides the corresponding update for Ubuntu 16.04 ESM.

Dnsmasq has been updated to 2.79-1 for Ubuntu 16.04 ESM in order to fix some security issues.

Original advisory details:

Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in certain configurations. A remote attacker could possibly use this issue to facilitate DNS cache poisoning attacks.

References

Affected packages

Ubuntu:Pro:16.04:LTS / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.16.04.1+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.79-1ubuntu0.16.04.1+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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.79-1ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq"
        },
        {
            "binary_version": "2.79-1ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-base"
        },
        {
            "binary_version": "2.79-1ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-base-lua"
        },
        {
            "binary_version": "2.79-1ubuntu0.16.04.1+esm1",
            "binary_name": "dnsmasq-utils"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2021-3448",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}