CVE-2018-5730: Low severity MIT Kerberos 5 vulnerability
A flaw was found in MIT krb5 1.6 or later, an authenticated kadmin user with permission to add principals to an LDAP Kerberos database can 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.
Reference: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891869
Upstream patch: https://github.com/krb5/krb5/commit/e1caf6fb74981da62039846931ebdffed71309d1
Other sources
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.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/krb5to a version that resolves this vulnerability.Fixed in 1.18.3-6+deb11u5Fixed in 1.18.3-6+deb11u7Fixed in 1.20.1-2+deb12u4Fixed in 1.20.1-2+deb12u2Fixed in 1.21.3-5Fixed in 1.22.1-2 - Upgrade
Upgrade
MIT krb5to a version that resolves this vulnerability.Fixed in 1.6 or later
Event History
Frequently Asked Questions
What is CVE-2018-5730?
CVE-2018-5730 is a vulnerability in MIT krb5 1.6 or later that allows an authenticated kadmin to circumvent a DN containership check in an LDAP Kerberos database.
How severe is CVE-2018-5730?
CVE-2018-5730 has a severity score of 3.8, which is classified as medium severity.
What software is affected by CVE-2018-5730?
MIT Kerberos 5, Fedoraproject Fedora, Debian Debian Linux, and Redhat Enterprise Linux(Different versions) are affected by CVE-2018-5730.
What is the fix for CVE-2018-5730?
To fix CVE-2018-5730, update to the recommended versions: 1.17-3+deb10u4, 1.17-3+deb10u6, 1.18.3-6+deb11u4, 1.18.3-6+deb11u3, 1.20.1-2+deb12u1, or 1.20.1-5.
Where can I find more information about CVE-2018-5730?
You can find more information about CVE-2018-5730 at the following references: http://www.securitytracker.com/id/1042071, https://access.redhat.com/errata/RHBA-2019:0327, and https://access.redhat.com/errata/RHSA-2018:3071.