Bug 41034 – Set "ntlm auth = no" in smb.conf (Samba/AD)

Bug 41034 - Set "ntlm auth = no" in smb.conf (Samba/AD)


Summary:	Set "ntlm auth = no" in smb.conf (Samba/AD)

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Samba4
Version:	UCS 4.1
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 4.1-1-errata
Assigned To:	Arvid Requate
QA Contact:	Felix Botner

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Depends on:
Blocks:
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Reported:	2016-04-12 11:13 CEST by Arvid Requate
Modified:	2016-09-21 18:10 CEST (History)
CC List:	0 users

See Also:	41033
What kind of report is it?:	Security Issue
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Description Arvid Requate

2016-04-12 11:13:12 CEST

+++ This bug was initially created as a clone of Bug #41033 +++

Without 'ntlm auth = no', there may still be clients not using NTLMv2. The elder original protocol version sends the password hashes across the wire, which may be observed and brute-forced easily. As far as I currently know Samba/AD DCs running 4.3.7 will default to this setting, but for member/file-servers it would be good to adjust the default too.

Comment 1 Arvid Requate

2016-04-12 11:15:11 CEST

We should also consider setting "smb signing = required", which also appears to be default for Samba 4.3.7 AD DCs.

Comment 2 Arvid Requate

2016-04-12 16:32:33 CEST

It's "server signing = mandatory" instead of "smb signing = required".

Comment 3 Arvid Requate

2016-04-13 14:20:43 CEST

Advisory: univention-samba4.yaml

Comment 4 Felix Botner

2016-04-14 14:48:51 CEST

FAIL - new ucr vars descriptions

/var/univention/buildsystem2/logs/ucs_4.1-0-0-errata4.1-1/univention-samba4_5.0.1-32.664.201604131409.log.bz2:
make[1]: Entering directory `/var/build/temp/tmp.GeeqAE1W3b/univention-samba4-5.0.1'
univention-install-config-registry
Incomplete entries in variable definition univention-samba4.univention-config-registry-variables
  samba/ntlm/auth:
    categories

univention-samba4.univention-config-registry-variables is not up-to-date.


OK - no changes in default settings
OK - new ucr vars

Comment 5 Arvid Requate

2016-04-14 17:13:35 CEST

Fixed, rebuilt, advisory updated.

Comment 6 Felix Botner

2016-04-15 10:09:39 CEST

(In reply to Arvid Requate from comment #5)
> Fixed, rebuilt, advisory updated.

OK - ucr desc
OK - YAML

Comment 7 Philipp Hahn

2016-04-15 14:49:40 CEST

<http://errata.software-univention.de/ucs/4.1/153.html>