CVE-2018-21029

A flaw in systemd-resolved was found to incorrectly verify certificates of a DNS resolver used for DNS Over TLS when the DNSOverTLS option is set to yes. A remote attacker in the network path between the vulnerable system and the DNS resolver may use this flaw to perform a man-in-the-middle attack and eavesdrop or modify DNS queries and responses. The attacker can learn the sites visited by a victim user, or redirect the victim user to malicious sites.

Versions of systemd as shipped with Red Hat Enterprise Linux 7 are not affected by this issue as they did not include support for DNSOverTLS option. Versions of systemd as shipped with Red Hat Enterprise Linux 8 are not affected by this issue as they did not support the yes value of the DNSOverTLS option.

OpenShift Container Platform 4.1 ships a version of systemd from Red Hat Enterprise Linux 8 and is thus also not affected by this issue.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.