Server Name Indication and Hostname Validation Issues in systemd by systemd
CVE-2018-21029

9.8CRITICAL

Key Information:

Vendor

Systemd Project

Status
Systemd
Vendor
CVE Published:
30 October 2019

What is CVE-2018-21029?

systemd versions 239 through 245 exhibit a weakness in their handling of DNS Over TLS, permitting any certificate signed by a trusted certificate authority without proper hostname validation due to the absence of Server Name Indication (SNI). This may lead to potential security risks where attackers could exploit the lack of hostname verification during DNS queries, raising concerns over the integrity of encrypted communications.

References

https://github.com/systemd/systemd/issues/9397
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https://blog.cloudflare.com/dns-encryption-explained/
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https://github.com/systemd/systemd/blob/v243/src/resolve/...
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CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.