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CVE-2018-16860

Published: 14 May 2019

A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
heimdal
Launchpad, Ubuntu, Debian
bionic
Released (7.5.0+dfsg-1ubuntu0.1)
cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Not vulnerable
(7.5.0+dfsg-3build1)
focal Not vulnerable
(7.5.0+dfsg-3build1)
groovy Not vulnerable
(7.5.0+dfsg-3build1)
hirsute Not vulnerable
(7.5.0+dfsg-3build1)
impish Not vulnerable
(7.5.0+dfsg-3build1)
jammy Not vulnerable
(7.5.0+dfsg-3build1)
kinetic Not vulnerable
(7.5.0+dfsg-3build1)
trusty
Released (1.6~git20131207+dfsg-1ubuntu1.2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (7.6, 7.5.0+dfsg-3, 7.1.0+dfsg-13+deb9u3)
xenial
Released (1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://github.com/heimdal/heimdal/commit/c6257cc2c842c0faaeb4ef34e33890ee88c4cbba
samba
Launchpad, Ubuntu, Debian
bionic
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.10)
cosmic
Released (2:4.8.4+dfsg-2ubuntu2.4)
disco
Released (2:4.10.0+dfsg-0ubuntu2.1)
focal
Released (2:4.10.0+dfsg-0ubuntu2.1)
jammy
Released (2:4.10.0+dfsg-0ubuntu2.1)
kinetic
Released (2:4.10.0+dfsg-0ubuntu2.1)
upstream Needs triage

xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.20)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H