USN-6657-2

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    USN-6657-2

    Published: 24 Apr 2024Last Modified: 25 Jun 2026

    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: https://ubuntu.com/security/notices/USN-6657-2, https://ubuntu.com/security/CVE-2023-28450, https://ubuntu.com/security/CVE-2023-50387, https://ubuntu.com/security/CVE-2023-50868

    Affected packages

    Package

    Name: dnsmasq

    Purl: pkg:deb/ubuntu/dnsmasq?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.90-0ubuntu0.16.04.1+esm1

    Affected versions

    2.75-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-6657-2 | CVE-DB