CVE-2018-16841 Information

Description

Samba from version 4.3.0 and before versions 4.7.12 4.8.7 and 4.9.3 are vulnerable to a denial of service. 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.

CVSS Vector

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

Reference

http://www.securityfocus.com/bid/106023 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841 https://security.gentoo.org/glsa/202003-52 https://security.netapp.com/advisory/ntap-20181127-0001/ https://usn.ubuntu.com/3827-1/ https://usn.ubuntu.com/3827-2/ https://www.debian.org/security/2018/dsa-4345 https://www.samba.org/samba/security/CVE-2018-16841.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5