CVE-2018-20217: Medium severity kerberos vulnerability
A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. 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.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is CVE-2018-20217?
CVE-2018-20217 is a vulnerability in MIT Kerberos 5 (krb5) before version 1.17 that allows an attacker with a krbtgt ticket using an older encryption type to crash the KDC by making an S4U2Self request.
How does CVE-2018-20217 affect MIT Kerberos?
CVE-2018-20217 affects MIT Kerberos 5 (krb5) before version 1.17 by causing a crash in the KDC if an attacker can obtain a krbtgt ticket with an older encryption type.
What is the severity of CVE-2018-20217?
CVE-2018-20217 has a severity rating of 5.3 (medium).
How can I fix CVE-2018-20217 in MIT Kerberos?
To fix CVE-2018-20217 in MIT Kerberos, update to version 1.17 or later.
Are there any references for CVE-2018-20217?
Yes, here are some references for CVE-2018-20217: [MIT Kerberos RT Ticket](http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763), [MIT Kerberos Commit](https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086), [Debian LTS Announcement](https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html).