What’s Vulnerable › Vulnerabilities

CVE-2018-5730

• Severity: low (CVSS 3.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-06 · updated 2026-06-17
• Weakness: CWE-90

Description

MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to circumvent a DN containership check by supplying both a "linkdn" and "containerdn" database argument, or by supplying a DN string which is a left extension of a container DN string but is not hierarchically within the container DN.

Affected products

• Debian Linux: 8.0, 9.0
• Fedoraproject Fedora: 26, 27
• MIT Kerberos 5: from 5-1.6 before 5-1.21.2 — fixed in 5-1.21.2
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Workstation: 7.0

How to fix

Upgrade to a fixed version: MIT Kerberos 5 5-1.21.2. Check the vendor advisory for mitigations.

References

• http://www.securitytracker.com/id/1042071
• https://access.redhat.com/errata/RHBA-2019:0327
• https://access.redhat.com/errata/RHSA-2018:3071
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891869
• https://bugzilla.redhat.com/show_bug.cgi?id=1551082
• https://github.com/krb5/krb5/commit/e1caf6fb74981da62039846931ebdffed71309d1
• https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html
• https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GK5T6JPMBHBPKS7HNGHYUUF4KKRMNSNU/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIFUL3CPM4S5TOXTTOCQ3CUZN6XCXUTR/
• http://www.securitytracker.com/id/1042071
• https://access.redhat.com/errata/RHBA-2019:0327

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