CVE-2018-16853

Description

Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.

How to fix CVE-2018-16853

To remediate CVE-2018-16853, 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-2018-16853 being exploited?

Low — EPSS is 4.9%, meaning exploitation activity has not been observed at scale.

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-2018-16853
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2018-16853