PT-2018-15293 · Mit+4 · Mit Kerberos 5+4

Published 2018-12-26 · Updated 2024-06-15 · CVE-2018-20217

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions MIT Kerberos 5 (aka krb5) versions prior to 1.17

Description A Reachable Assertion issue was discovered in the KDC. 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.

Recommendations For versions prior to 1.17, update to version 1.17 or later to resolve the issue. As a temporary workaround, consider restricting the use of older encryption types (single-DES, triple-DES, or RC4) for obtaining krbtgt tickets until a patch is applied.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

ALT-PU-2019-1019

BDU:2026-01432

CVE-2018-20217

DLA-1643-1

DLA-2771-1

MGASA-2019-0028

OPENSUSE-SU-2019:0063-1

OPENSUSE-SU-2019_0063-1

OPENSUSE-SU-2019_0085-1

OPENSUSE-SU-2024:11549-1

SUSE-SU-2019:0111-1

SUSE-SU-2019:0113-1

SUSE-SU-2019:0113-2

SUSE-SU-2019_0111-1

SUSE-SU-2019_0113-1

SUSE-SU-2019_0113-2

USN-5828-1

Affected Products

Alt Linux

Linuxmint

Mit Kerberos 5

Suse

Ubuntu

References · 40

• https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086 · Patch
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-20217 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5828-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2018-20217 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-20217 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2018-20217 · Security Note
• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763 · Patch
• https://osv.dev/vulnerability/USN-5828-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20251225SE16 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11549-1 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2019-0028 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-20217 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2019-0028.html · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2019:0111-1 · Vendor Advisory