ALT-PU-2019-3220-1
Closed vulnerabilities
Published: 2019-10-31
Modified: 2024-11-21
Modified: 2024-11-21
CVE-2018-21029
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)
Severity: CRITICAL (9.8)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References:
- https://blog.cloudflare.com/dns-encryption-explained/
- 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/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/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/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63
- https://github.com/systemd/systemd/issues/9397
- https://github.com/systemd/systemd/issues/9397
- https://github.com/systemd/systemd/pull/13870
- https://github.com/systemd/systemd/pull/13870
- FEDORA-2019-4c3ce3aa5c
- FEDORA-2019-4c3ce3aa5c
- https://security.netapp.com/advisory/ntap-20191122-0002/
- https://security.netapp.com/advisory/ntap-20191122-0002/
- https://tools.ietf.org/html/rfc7858#section-4.1
- https://tools.ietf.org/html/rfc7858#section-4.1