Bug 1589651 (CVE-2018-1139) - CVE-2018-1139 samba: Weak authentication protocol regression
Summary: CVE-2018-1139 samba: Weak authentication protocol regression
Status: NEW
Alias: CVE-2018-1139
Product: Security Response
Classification: Other
Component: vulnerability   
(Show other bugs)
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Whiteboard: impact=moderate,public=20180816,repor...
Keywords: Security
Depends On: 1617915 1614265 1614744 1617916
Blocks: 1577167
TreeView+ depends on / blocked
Reported: 2018-06-11 05:38 UTC by Huzaifa S. Sidhpurwala
Modified: 2018-11-06 21:34 UTC (History)
17 users (show)

Fixed In Version: samba 4.7.9, samba 4.8.4
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way samba 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.
Story Points: ---
Clone Of:
Last Closed:
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2612 None None None 2018-09-04 06:31 UTC
Red Hat Product Errata RHSA-2018:2613 None None None 2018-09-04 06:29 UTC
Red Hat Product Errata RHSA-2018:3056 None None None 2018-10-30 07:26 UTC

Description Huzaifa S. Sidhpurwala 2018-06-11 05:38:10 UTC
As per upstream advisory:

Samba releases 4.7.0 to 4.8.0 (inclusive) contain an error which allows authentication using NTLMv1 over an SMB1 transport, even when NTLMv1 is explicitly disabled. This problem does not occur over SMB2, it is a SMB1-only issue.

Normally, the use of NTLMv1 is disabled by default in favor of NTLMv2. This has been the default since Samba 4.5. A code restructuring in the NTLM authentication implementation of Samba in 4.7.0 caused this regression to occur.

Comment 2 Huzaifa S. Sidhpurwala 2018-06-11 05:45:40 UTC

Name: Vivek Das (Red Hat)

Comment 4 Sam Fowler 2018-08-16 03:32:02 UTC
External Reference:


Comment 5 Sam Fowler 2018-08-16 07:14:30 UTC
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1617916]

Comment 7 errata-xmlrpc 2018-09-04 06:29:23 UTC
This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.4 for RHEL 7

Via RHSA-2018:2613 https://access.redhat.com/errata/RHSA-2018:2613

Comment 8 errata-xmlrpc 2018-09-04 06:31:46 UTC
This issue has been addressed in the following products:

  Red Hat Gluster Storage 3.4 for RHEL 6

Via RHSA-2018:2612 https://access.redhat.com/errata/RHSA-2018:2612

Comment 9 errata-xmlrpc 2018-10-30 07:26:24 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3056 https://access.redhat.com/errata/RHSA-2018:3056

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