CVE-2018-21029

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    CVE-2018-21029

    Published: 30 Oct 2019Last Modified: 7 Aug 2026

    Summary:

    Details: systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/, https://blog.cloudflare.com/dns-encryption-explained/, https://security.netapp.com/advisory/ntap-20191122-0002/, https://tools.ietf.org/html/rfc7858#section-4.1, https://github.com/systemd/systemd/issues/9397, https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63, https://github.com/systemd/systemd/pull/13870, https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207, https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- de7436b02badc82200dc127ff190b8155769b8e7
    Fixed -db9c5ae73e23d816e2df2a3e10a9a2a60b5b3ed7

    Affected versions

    v244-rc1

    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
    CVE-2018-21029 | CVE-DB