CVE-2018-20217

Name of the Vulnerable Software and Affected Versions MIT Kerberos 5 (aka krb5) versions prior to 1.17

Description A Reachable Assertion issue was discovered in the KDC. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.

Recommendations For versions prior to 1.17, update to version 1.17 or later to resolve the issue. As a temporary workaround, consider restricting the use of older encryption types (single-DES, triple-DES, or RC4) for obtaining krbtgt tickets until a patch is applied.