CVE-2016-2118

Publication date 12 April 2016

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

The MS-SAMR and MS-LSAD protocol implementations in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 mishandle DCERPC connections, which allows man-in-the-middle attackers to perform protocol-downgrade attacks and impersonate users by modifying the client-server data stream, aka "BADLOCK."

Read the notes from the security team

Status

Package Ubuntu Release Status
samba 17.04 zesty
Fixed 2:4.3.8+dfsg-0ubuntu1
16.10 yakkety
Fixed 2:4.3.8+dfsg-0ubuntu1
16.04 LTS xenial
Fixed 2:4.3.8+dfsg-0ubuntu1
15.10 wily
Fixed 2:4.3.8+dfsg-0ubuntu0.15.10.2
14.04 LTS trusty
Fixed 2:4.3.8+dfsg-0ubuntu0.14.04.2
12.04 LTS precise
Fixed 2:3.6.25-0ubuntu0.12.04.2
samba4 17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life

Notes

mdeslaur

This is known as Badlock

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references