CVE-2018-21029

CRITICAL

9.8

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)

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published10/30/2019

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

fedoraproject:fedorasystemd_project:systemd

Weaknesses (CWE)

CWE-295

References

https://blog.cloudflare.com/dns-encryption-explained/(cve@mitre.org)

https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207(cve@mitre.org)

https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207(cve@mitre.org)

https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63(cve@mitre.org)

https://github.com/systemd/systemd/issues/9397(cve@mitre.org)

https://github.com/systemd/systemd/pull/13870(cve@mitre.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20191122-0002/(cve@mitre.org)

https://tools.ietf.org/html/rfc7858#section-4.1(cve@mitre.org)

https://blog.cloudflare.com/dns-encryption-explained/(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/systemd/systemd/issues/9397(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/systemd/systemd/pull/13870(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20191122-0002/(af854a3a-2127-422b-91ae-364da2661108)

https://tools.ietf.org/html/rfc7858#section-4.1(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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