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CVE-2018-21029

Published: 30 October 2019

** DISPUTED ** 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).

Notes

AuthorNote
mdeslaur
DNS over TLS not enabled by default in Ubuntu.
this is only an issue in v243 because strict mode got
introduced (DNSOverTLS=yes). Versions earlier than 243 only
implemented opportunistic mode which, according to specs,
might or not validate the resolver and can also be downgraded.
Priority

Low

CVSS 3 base score: 9.8

Status

Package Release Status
systemd
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
disco Ignored
(reached end-of-life)
eoan Not vulnerable
(code not present)
precise Does not exist

trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)