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==========================================================================
Ubuntu Security Notice USN-2855-2
February 16, 2016

samba regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-2855-1 introduced a regression in Samba.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

USN-2855-1 fixed vulnerabilities in Samba. The upstream fix for
CVE-2015-5252 introduced a regression in certain specific environments.
This update fixes the problem.

Original advisory details:

 Thilo Uttendorfer discovered that the Samba LDAP server incorrectly handled
 certain packets. A remote attacker could use this issue to cause the LDAP
 server to stop responding, resulting in a denial of service. This issue
 only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10.
 (CVE-2015-3223)
  Jan Kasprzak discovered that Samba incorrectly handled certain symlinks. A
 remote attacker could use this issue to access files outside the exported
 share path. (CVE-2015-5252)
  Stefan Metzmacher discovered that Samba did not enforce signing when
 creating encrypted connections. If a remote attacker were able to perform a
 man-in-the-middle attack, this flaw could be exploited to view sensitive
 information. (CVE-2015-5296)
  It was discovered that Samba incorrectly performed access control when
 using the VFS shadow_copy2 module. A remote attacker could use this issue
 to access snapshots, contrary to intended permissions. (CVE-2015-5299)
  Douglas Bagnall discovered that Samba incorrectly handled certain string
 lengths. A remote attacker could use this issue to possibly access
 sensitive information. (CVE-2015-5330)
  It was discovered that the Samba LDAP server incorrectly handled certain
 packets. A remote attacker could use this issue to cause the LDAP server to
 stop responding, resulting in a denial of service. This issue only affected
 Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-7540)
  Andrew Bartlett discovered that Samba incorrectly checked administrative
 privileges during creation of machine accounts. A remote attacker could
 possibly use this issue to bypass intended access restrictions in certain
 environments. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and
 Ubuntu 15.10. (CVE-2015-8467)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.10:
  samba                           2:4.1.17+dfsg-4ubuntu3.2

Ubuntu 14.04 LTS:
  samba                           2:4.1.6+dfsg-1ubuntu2.14.04.12

Ubuntu 12.04 LTS:
  samba                           2:3.6.3-2ubuntu2.14

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2855-2
  http://www.ubuntu.com/usn/usn-2855-1
  https://launchpad.net/bugs/1545750

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.1.17+dfsg-4ubuntu3.2
  https://launchpad.net/ubuntu/+source/samba/2:4.1.6+dfsg-1ubuntu2.14.04.12
  https://launchpad.net/ubuntu/+source/samba/2:3.6.3-2ubuntu2.14



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