Bug 1589651 (CVE-2018-1139)

Summary:	CVE-2018-1139 samba: Weak authentication protocol regression
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abokovoy, anoopcs, asn, gdeschner, jarrpa, jstephen, lmohanty, madam, rhs-smb, sankarshan, sbose, security-response-team, sisharma, ssaha, ssorce, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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:		Environment:
Last Closed:	2019-06-10 10:28:36 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1614265, 1614744, 1617915, 1617916
Bug Blocks:	1577167

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

Acknowledgments:

Name: Vivek Das (Red Hat)

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

External Reference:

https://www.samba.org/samba/security/CVE-2018-1139.html

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