CVEvulnerability
CVE-2018-20217
5.3 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2018-12-26
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 3.5 LOW — AV:N/AC:M/Au:S/C:N/I:N/A:P
- Weaknesses
- CWE-617
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.
Affected configurations
• mit kerberos (< 5-1.17)
• debian debian linux 8.0
• debian debian linux 9.0
Related
Weakness · CWE (1)
- CWE-617 Reachable Assertion weakness
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763 Patch, Third Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086 Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/ lists.fedoraproject.org
- https://security.netapp.com/advisory/ntap-20190416-0006/ Third Party Advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763 Patch, Third Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086 Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/ lists.fedoraproject.org
- https://security.netapp.com/advisory/ntap-20190416-0006/ Third Party Advisory