CVE-2018-1139

Publication date 14 August 2018

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.1 · High

Score breakdown

Description

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.

Read the notes from the security team

Status

Package Ubuntu Release Status
samba 18.04 LTS bionic
Fixed 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

4.7.0 to 4.8.3 only

Severity score breakdown

Parameter Value
Base score 8.1 · High
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references