VulnerabilityModified
CVE-2018-20217
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.
MEDIUM 5.3EPSS 1.42%
Does this matter?
Lower severity and a low EPSS score (1.42%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.42% probability · 71th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-617
- Affected
- mit/kerberos · debian/debian linux
- Source
- cve@mitre.org
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763Patch, Third Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
- https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763Patch, Third Party Advisory
- https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
- https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.