Samba 4.4.16 Available for Download

Samba 4.4.16 (gzipped)

Patch (gzipped) against Samba 4.4.15

                   Release Notes for Samba 4.4.16
                          September 20, 2017

This is a security release in order to address the following defects:

o  CVE-2017-12150 (SMB1/2/3 connections may not require signing where they
o  CVE-2017-12151 (SMB3 connections don't keep encryption across DFS redirects)
o  CVE-2017-12163 (Server memory information leak over SMB1)


o  CVE-2017-12150:
   A man in the middle attack may hijack client connections.

o  CVE-2017-12151:
   A man in the middle attack can read and may alter confidential
   documents transferred via a client connection, which are reached
   via DFS redirect when the original connection used SMB3.

o  CVE-2017-12163:
   Client with write access to a share can cause server memory contents to be
   written into a file or printer.

For more details and workarounds, please see the security advisories:


Changes since 4.4.15:

o  Jeremy Allison <>
   * BUG 12836: s3: smbd: Fix a read after free if a chained SMB1 call goes
   * BUG 13020: CVE-2017-12163: s3:smbd: Prevent client short SMB1 write from
     writing server memory to file.

o  Ralph Boehme <>
   * BUG 12885: s3/smbd: Let non_widelink_open() chdir() to directories

o  Stefan Metzmacher <>
   * BUG 12996: CVE-2017-12151: Keep required encryption across SMB3 dfs
   * BUG 12997: CVE-2017-12150: Some code path don't enforce smb signing
     when they should.