CVE-2016-2114

Publication date 12 April 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The SMB1 protocol implementation in Samba 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 does not recognize the “server signing = mandatory” setting, which allows man-in-the-middle attackers to spoof SMB servers by modifying the client-server data stream.

Read the notes from the security team

Status

Show unmaintained releases

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	Not affected
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

4.0.0+ only

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-2950-1
Samba vulnerabilities
18 April 2016