Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mit | Kerberos | < 5-1.17 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763PatchThird Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763PatchThird Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory
FAQ
What is CVE-2018-20217?
CVE-2018-20217 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2018-20217?
CVE-2018-20217 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-20217?
Check the references section above for vendor advisories and patch information. Affected products include: Mit Kerberos, Debian Debian Linux.