CVE-2018-16841

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.

How to fix CVE-2018-16841

To remediate CVE-2018-16841, upgrade the affected package to a fixed version below.

• —upgrade to 4.8.7-r0 or later
• —upgrade to 2:4.9.2+dfsg-2 or later

Is CVE-2018-16841 being exploited?

Moderate — EPSS is 9.5%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 4.8.7-r0
• from 0, < 2:4.9.2+dfsg-2

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2018-16841
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2018-16841