From 1d3bbd71736365b745a29f4e6bfafc2537d7aa71 Mon Sep 17 00:00:00 2001 From: Karolin Seeger Date: Fri, 18 Sep 2020 13:18:55 +0200 Subject: WHATSNEW: Add release notes for Samba 4.10.18. CVE-2020-1472: Samba impact of "ZeroLogon". Signed-off-by: Karolin Seeger --- WHATSNEW.txt | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 111 insertions(+), 2 deletions(-) diff --git a/WHATSNEW.txt b/WHATSNEW.txt index a99a8bdcef5..382676dbf22 100644 --- a/WHATSNEW.txt +++ b/WHATSNEW.txt @@ -1,3 +1,112 @@ + =============================== + Release Notes for Samba 4.10.18 + September 18, 2020 + =============================== + + +This is a security release in order to address the following defect: + +o CVE-2020-1472: Unauthenticated domain takeover via netlogon ("ZeroLogon"). + +The following applies to Samba used as domain controller only (most +seriously the Active Directory DC, but also the classic/NT4-style DC). + +Installations running Samba as a file server only are not directly +affected by this flaw, though they may need configuration changes to +continue to talk to domain controllers (see "file servers and domain +members" below). + +The netlogon protocol contains a flaw that allows an authentication +bypass. This was reported and patched by Microsoft as CVE-2020-1472. +Since the bug is a protocol level flaw, and Samba implements the +protocol, Samba is also vulnerable. + +However, since version 4.8 (released in March 2018), the default +behaviour of Samba has been to insist on a secure netlogon channel, +which is a sufficient fix against the known exploits. This default is +equivalent to having 'server schannel = yes' in the smb.conf. + +Therefore versions 4.8 and above are not vulnerable unless they have +the smb.conf lines 'server schannel = no' or 'server schannel = auto'. + +Samba versions 4.7 and below are vulnerable unless they have 'server +schannel = yes' in the smb.conf. + +Note each domain controller needs the correct settings in its smb.conf. + +Vendors supporting Samba 4.7 and below are advised to patch their +installations and packages to add this line to the [global] section if +their smb.conf file. + +The 'server schannel = yes' smb.conf line is equivalent to Microsoft's +'FullSecureChannelProtection=1' registry key, the introduction of +which we understand forms the core of Microsoft's fix. + +Some domains employ third-party software that will not work with a +'server schannel = yes'. For these cases patches are available that +allow specific machines to use insecure netlogon. For example, the +following smb.conf: + + server schannel = yes + server require schannel:triceratops$ = no + server require schannel:greywacke$ = no + +will allow only "triceratops$" and "greywacke$" to avoid schannel. + +More details can be found here: +https://www.samba.org/samba/security/CVE-2020-1472.html + + +Changes since 4.10.17 +--------------------- + +o Jeremy Allison + * BUG 14497: CVE-2020-1472(ZeroLogon): s3:rpc_server/netlogon: Protect + netr_ServerPasswordSet2 against unencrypted passwords. + +o Günther Deschner + * BUG 14497: CVE-2020-1472(ZeroLogon): s3:rpc_server/netlogon: Support + "server require schannel:WORKSTATION$ = no" about unsecure configurations. + +o Bjoern Jacke + * BUG 14422: util: Fix build on AIX by fixing the order of replace.h include. + +o Gary Lockyer + * BUG 14497: CVE-2020-1472(ZeroLogon): s4 torture rpc: repeated bytes in + client challenge. + +o Stefan Metzmacher + * BUG 14497: CVE-2020-1472(ZeroLogon): libcli/auth: Reject weak client + challenges in netlogon_creds_server_init() + "server require schannel:WORKSTATION$ = no" + +o Martin Schwenke + * BUG 14415: Fix build on FreeBSD. + + +####################################### +Reporting bugs & Development Discussion +####################################### + +Please discuss this release on the samba-technical mailing list or by +joining the #samba-technical IRC channel on irc.freenode.net. + +If you do report problems then please try to send high quality +feedback. If you don't provide vital information to help us track down +the problem then you will probably be ignored. All bug reports should +be filed under the "Samba 4.1 and newer" product in the project's Bugzilla +database (https://bugzilla.samba.org/). + + +====================================================================== +== Our Code, Our Bugs, Our Responsibility. +== The Samba Team +====================================================================== + + +Release notes for older releases follow: +---------------------------------------- + =============================== Release Notes for Samba 4.10.17 July 02, 2020 @@ -79,8 +188,8 @@ database (https://bugzilla.samba.org/). ====================================================================== -Release notes for older releases follow: ----------------------------------------- +---------------------------------------------------------------------- + =============================== Release Notes for Samba 4.10.16 -- cgit v1.2.1