UBUNTU-CVE-2022-30698

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    UBUNTU-CVE-2022-30698

    Published: 1 Aug 2022Last Modified: 2 Jun 2026
    Upstream:
    CVE-2022-30698
    Aliases:
    USN-5569-1

    Summary:

    Details: NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.

    References: https://ubuntu.com/security/CVE-2022-30698, https://www.nlnetlabs.nl/downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt, https://ubuntu.com/security/notices/USN-5569-1, https://www.cve.org/CVERecord?id=CVE-2022-30698

    Affected packages

    Package

    Name: unbound

    Purl: pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.4.20-1
    1.4.21-1
    1.4.21-1ubuntu1
    1.4.21-1ubuntu2
    1.4.22-1ubuntu1
    1.4.22-1ubuntu2
    1.4.22-1ubuntu3
    1.4.22-1ubuntu4
    1.4.22-1ubuntu4.14.04.1
    1.4.22-1ubuntu4.14.04.2
    1.4.22-1ubuntu4.14.04.3
    1.4.22-1ubuntu4.14.04.3+esm1
    1.4.22-1ubuntu4.14.04.3+esm2
    1.4.22-1ubuntu4.14.04.3+esm3

    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
    UBUNTU-CVE-2022-30698 | CVE-DB