CVE-2018-20217 Information

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 Vector

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

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.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/ https://security.netapp.com/advisory/ntap-20190416-0006/

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.3