Samba 4.3.6 Available for Download

Samba 4.3.6 (gzipped)

Patch (gzipped) against Samba 4.3.5

                   Release Notes for Samba 4.3.6
                           March 8, 2016

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

o  CVE-2015-7560 (Incorrect ACL get/set allowed on symlink path)
o  CVE-2016-0771 (Out-of-bounds read in internal DNS server)


o  CVE-2015-7560:
   All versions of Samba from 3.2.0 to 4.4.0rc3 inclusive are vulnerable to
   a malicious client overwriting the ownership of ACLs using symlinks.

   An authenticated malicious client can use SMB1 UNIX extensions to
   create a symlink to a file or directory, and then use non-UNIX SMB1
   calls to overwrite the contents of the ACL on the file or directory
   linked to.

o  CVE-2016-0771:
   All versions of Samba from 4.0.0 to 4.4.0rc3 inclusive, when deployed as
   an AD DC and choose to run the internal DNS server, are vulnerable to an
   out-of-bounds read issue during DNS TXT record handling caused by users
   with permission to modify DNS records.

   A malicious client can upload a specially constructed DNS TXT record,
   resulting in a remote denial-of-service attack. As long as the affected
   TXT record remains undisturbed in the Samba database, a targeted DNS
   query may continue to trigger this exploit.

   While unlikely, the out-of-bounds read may bypass safety checks and
   allow leakage of memory from the server in the form of a DNS TXT reply.

   By default only authenticated accounts can upload DNS records,
   as "allow dns updates = secure only" is the default.
   Any other value would allow anonymous clients to trigger this
   bug, which is a much higher risk.

Changes since 4.3.5:

o  Jeremy Allison <>
   * BUG 11648: CVE-2015-7560: Getting and setting Windows ACLs on symlinks can
     change permissions on link target.

o  Garming Sam <>
   * BUGs 11128, 11686: CVE-2016-0771: Read of uninitialized memory DNS TXT

o  Stefan Metzmacher <>
   * BUGs 11128, 11686: CVE-2016-0771: Read of uninitialized memory DNS TXT