Bugzilla – Bug 1116320
VUL-0: CVE-2018-16841: samba: KDC Crash with PKINIT
Last modified: 2019-11-30 15:38:59 UTC
is public CVE-2018-16841.html =========================================================== == Subject: Double-free in Samba AD DC KDC with PKINIT == == CVE ID#: CVE-2018-16841 == == Versions: All versions of Samba from 4.3.0 onwards. == == Summary: A user with a valid certificate or smart card can crash the Samba AD DC's KDC. =========================================================== =========== Description =========== When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process. There is no further vulnerability associated with this issue, merely a denial of service. ================== Patch Availability ================== Patches addressing both these issues have been posted to: http://www.samba.org/samba/security/ Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to correct the defect. Samba administrators are advised to upgrade to these releases or apply the patch as soon as possible. ================== CVSSv3 calculation ================== CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (6.5) ========== Workaround ========== Remove 'enable-pkinit = true' from the krb5.conf to disable smart-card login. ======= Credits ======= Originally reported by Alex MacCuish Patches provided by Andrew Bartlett of the Samba Team and Catalyst. ========================================================== == Our Code, Our Bugs, Our Responsibility. == The Samba Team ==========================================================
SUSE-SU-2018:4066-1: An update that solves four vulnerabilities and has 5 fixes is now available. Category: security (moderate) Bug References: 1068059,1087303,1087931,1101499,1102230,1116319,1116320,1116322,1116324 CVE References: CVE-2018-14629,CVE-2018-16841,CVE-2018-16851,CVE-2018-16853 Sources used: SUSE Linux Enterprise Module for Packagehub Subpackages 15 (src): samba-4.7.11+git.140.6bd0e5b30d8-4.21.1 SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 (src): samba-4.7.11+git.140.6bd0e5b30d8-4.21.1 SUSE Linux Enterprise Module for Basesystem 15 (src): samba-4.7.11+git.140.6bd0e5b30d8-4.21.1 SUSE Linux Enterprise High Availability 15 (src): samba-4.7.11+git.140.6bd0e5b30d8-4.21.1
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