CVE-2018-21029 — Vulnetix

CVE-2018-21029 PUBLISHED CVSS 7.5 HIGH

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)

EPSS 1.56% · 81.8th percentile

Risk Scores

CVSS 2.0

7.5

EPSS Score

1.56%

81.8th percentile

Affected Products

Vendor	Product	Versions
n/a	n/a	n/a
fedoraproject	fedora	31
systemd_project	systemd	239

Exploit Intelligence

https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207 (nist-nvd)
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207 (nist-nvd)
https://github.com/systemd/systemd/issues/9397 (circl)
https://blog.cloudflare.com/dns-encryption-explained/ (circl)
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63 (circl)
FEDORA-2019-4c3ce3aa5c (circl)
https://security.netapp.com/advisory/ntap-20191122-0002/ (circl)
https://github.com/systemd/systemd/pull/13870 (circl)
https://tools.ietf.org/html/rfc7858#section-4.1 (circl)
glcve_test.go (github-poc)

…and 3 more exploits

Timeline

Oct 30, 2019 CVE Published
Apr 14, 2021 EPSS Score
Jun 23, 2021 EPSS Score
Aug 24, 2021 EPSS Score
Dec 27, 2021 EPSS Score
Feb 4, 2022 EPSS Score
Feb 28, 2022 EPSS Score
May 2, 2022 EPSS Score
Sep 5, 2022 EPSS Score
Nov 6, 2022 EPSS Score
Jan 8, 2023 EPSS Score
Mar 7, 2023 EPSS Score

References

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