CVEvulnerability
CVE-2018-21029
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2019-10-30
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-295
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 configurations
• systemd project systemd (>= 239 < 244)
• fedoraproject fedora 31
Related
Weakness · CWE (1)
- CWE-295 Improper Certificate Validation weakness
References
- https://blog.cloudflare.com/dns-encryption-explained/ Third Party Advisory
- https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207 Exploit, Third Party Advisory
- https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207 Exploit, Third Party Advisory
- https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63 Patch, Third Party Advisory
- https://github.com/systemd/systemd/issues/9397 Issue Tracking, Third Party Advisory
- https://github.com/systemd/systemd/pull/13870 Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/ lists.fedoraproject.org
- https://security.netapp.com/advisory/ntap-20191122-0002/ Third Party Advisory
- https://tools.ietf.org/html/rfc7858#section-4.1 Third Party Advisory
- https://blog.cloudflare.com/dns-encryption-explained/ Third Party Advisory
- https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207 Exploit, Third Party Advisory
- https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207 Exploit, Third Party Advisory
- https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63 Patch, Third Party Advisory
- https://github.com/systemd/systemd/issues/9397 Issue Tracking, Third Party Advisory
- https://github.com/systemd/systemd/pull/13870 Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/ lists.fedoraproject.org
- https://security.netapp.com/advisory/ntap-20191122-0002/ Third Party Advisory
- https://tools.ietf.org/html/rfc7858#section-4.1 Third Party Advisory