CVE-2018-1057: Canonical Ubuntu Linux

High severity, CVSS 8.8. EPSS: 10% chance of exploitation in the next 30 days.

On a Samba 4 AD DC the LDAP server in all versions of Samba from 4.0.0 onwards incorrectly validates permissions to modify passwords over LDAP allowing authenticated users to change any other users' passwords, including administrative users and privileged service accounts (eg Domain Controllers).

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 17.10 only
• Debian Debian Linux: version 8.0 only
• Samba Samba: from 4.0.0, before 4.5.16 (fixed in 4.5.16); from 4.6.0, before 4.6.14 (fixed in 4.6.14); from 4.7.0, before 4.7.6 (fixed in 4.7.6)

Published 2018-03-13. Last modified 2026-06-17.