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CVE-2018-21029

CRITICAL

9.8

CVSS Severity Score

EPSS Score0.0640%

EPSS Percentile4.03th

PublishedOct 30, 2019

Last ModifiedNov 21, 2024

Vulnerability Description

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)

Affected Platforms (CPE)

📦

Systemd Project

Systemd

>= 239 and < 244

💻

Fedoraproject

Fedora

= 31

References & Advisories

🔗 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/

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