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    CVE-2018-21029

    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)

    Published:Jun 24, 2018
    Last Modified:Nov 21, 2024
    EPS:Oct 30, 2019
    EPSS Score:0.0156
    CVSS Score:9.8

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Systemd Project
    Product
    Systemd

    Exploits

    https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

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    References

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

    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