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CVE-2018-20217

Date: December 26, 2018

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.

Language: C

Severity Score

Related Resources (11)

https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
https://access.redhat.com/security/cve/CVE-2018-20217
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
https://security.netapp.com/advisory/ntap-20190416-0006/
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
https://security.alpinelinux.org/vuln/CVE-2018-20217
https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html
https://nvd.nist.gov/vuln/detail/CVE-2018-20217
https://security-tracker.debian.org/tracker/CVE-2018-20217
https://www.mend.io/vulnerability-database/CVE-2018-20217

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Reachable Assertion

CWE-617

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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