UBUNTU-CVE-2019-19331

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    UBUNTU-CVE-2019-19331

    Published: 16 Dec 2019Last Modified: 22 Apr 2026
    Upstream:
    CVE-2019-19331
    Aliases:
    USN-7047-1

    Summary:

    Details: knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).

    References: https://ubuntu.com/security/CVE-2019-19331, https://www.openwall.com/lists/oss-security/2019/12/04/4, https://www.cve.org/CVERecord?id=CVE-2019-19331, https://ubuntu.com/security/notices/USN-7047-1

    Affected packages

    Package

    Name: knot-resolver

    Purl: pkg:deb/ubuntu/[email protected]~beta3-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.0.0~beta2-123-g6134920-1
    1.0.0~beta3-1
    1.0.0~beta3-1ubuntu0.1~esm1

    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