CVE-2018-20217
First published: Wed Dec 26 2018(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| MIT Kerberos | <5-1.17 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
- 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@lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
- https://security.netapp.com/advisory/ntap-20190416-0006/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
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).
- collector/nvd-index
- agent/type
- agent/softwarecombine
- agent/remedy
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/last-modified-date
- agent/author
- agent/weakness
- agent/severity
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/mit
- canonical/mit kerberos
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/8.0
- version/debian debian linux/9.0