CVE-2018-16841

MEDIUM

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.

References

http://www.securityfocus.com/bid/106023

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16841

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

Details

Source: MITRE

Published: 2018-11-28

Updated: 2019-10-09

Type: CWE-415

Risk Information

CVSS v2.0

Base Score: 4

Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 8

Severity: MEDIUM

CVSS v3.0

Base Score: 6.5

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

Impact Score: 3.6

Exploitability Score: 2.8

Severity: MEDIUM