[Bug 1701073] [NEW] CVE-2017-2619 regression breaks symlinks

[Dave Kettmann]

Public bug reported:

Found in current version in Xenial (4.3.11+dfsg-0ubuntu0.16.04.7). When
share's path is '/', symlinks do not work properly from Windows client.
Gives "Cannot Access" error.

To reproduce:

1. Install samba and related dependencies

apt install -y samba

2. Add a share at the end of the default file that uses '/' as the path:

[reproducer]
        comment = share
        browseable = no
        writeable = yes
        create mode = 0600
        directory mode = 0700
        path = /

3. Attempt to access a symlink somewhere within the path of the share
with a Windows client.

4. Receive "Windows cannot access..." related error

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1701073

Title:
  CVE-2017-2619 regression breaks symlinks

Status in samba package in Ubuntu:
  New

Bug description:
  Found in current version in Xenial (4.3.11+dfsg-0ubuntu0.16.04.7).
  When share's path is '/', symlinks do not work properly from Windows
  client. Gives "Cannot Access" error.

  To reproduce:

  1. Install samba and related dependencies

  apt install -y samba

  2. Add a share at the end of the default file that uses '/' as the
  path:

  [reproducer]
          comment = share
          browseable = no
          writeable = yes
          create mode = 0600
          directory mode = 0700
          path = /

  3. Attempt to access a symlink somewhere within the path of the share
  with a Windows client.

  4. Receive "Windows cannot access..." related error

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