Samba [Bug 13272] [SECURITY] CVE-2018-1057

[Andrew Bartlett]

Please ensure that Ubuntu includes the fixes for https://bugzilla.samba.org/show_bug.cgi?id=13272 urgently as soon as the embargo is lifted. This is a serious issue.

Ideally also ensure that for the 4.7 series in 18.04 that you pick up the new 4.7.6 tarball and so avoid shipping https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1755057 (rather than just applying the patch).

Thanks!

[Andrew Bartlett (abartlet)]

Additionally, it seems Ubuntu is shipping Samba 4.3, to which patches have not been provided (as they don't backport cleanly) in 14.04 and 16.04.

Are you planning to simply upgrade Samba, otherwise there isn't much time to attempt a backport!

This is a very serious issue (CVSS 8.2)

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:
    8.8
Impact Subscore:
    5.9
Exploitability Subscore:
    2.8
CVSS Temporal Score:
    8.2
CVSS Environmental Score:
    NA
Modified Impact Subscore:
    NA
Overall CVSS Score:
    8.2

[Tyler Hicks (tyhicks)]

Hello! Updates for 17.10, 16.04 LTS, and 14.04 LTS have already been prepared and will be published on the day that the embargo is lifted. Thanks for reaching out to us.

[Tyler Hicks (tyhicks)]

Updates were released for this issue:

  https://usn.ubuntu.com/3595-1/

[Launchpad Janitor (janitor)]

This bug was fixed in the package samba - 2:4.7.6+dfsg~ubuntu-0ubuntu1

---------------
samba (2:4.7.6+dfsg~ubuntu-0ubuntu1) bionic; urgency=medium

  * New upstream version:
    - Fix database corruption bug when upgrading from samba 4.6 or lower
      AD controllers (LP: #1755057)
    - Fix security issues: CVE-2018-1050 and CVE-2018-1057 (LP: #1755059)
  * Remaining changes:
    - debian/VERSION.patch: Update vendor string to "Ubuntu".
    - debian/smb.conf;
      + Add "(Samba, Ubuntu)" to server string.
      + Comment out the default [homes] share, and add a comment about
        "valid users = %s" to show users how to restrict access to
        \\server\username to only username.
    - debian/samba-common.config:
      + Do not change priority to high if dhclient3 is installed.
    - Add apport hook:
      + Created debian/source_samba.py.
      + debian/rules, debian/samba-common-bin.install: install hook.
    - Add extra DEP8 tests to samba (LP #1696823):
      + d/t/control, d/t/cifs-share-access: access a file in a share using cifs
      + d/t/control, d/t/smbclient-anonymous-share-list: list available shares
        anonymously
      + d/t/control, d/t/smbclient-authenticated-share-list: list available
        shares using an authenticated connection
      + d/t/control, d/t/smbclient-share-access: create a share and download a
        file from it
    - d/samba-common.dhcp: If systemctl is available, use it to query the
      status of the smbd service before trying to reload it. Otherwise,
      keep the same check as before and reload the service based on the
      existence of the initscript. (LP #1579597)
    - d/control, d/rules: Disable glusterfs support because it's not in main.
      MIR bug is https://launchpad.net/bugs/1274247

 -- Andreas Hasenack <email address hidden> Tue, 13 Mar 2018 16:58:49 -0300