Ubuntu 13.10, USN-2054-1: Critical Samba Access Problems Explained

ubuntu

December 11, 2013

Several security issues were fixed in Samba.

Summary

Several security issues were fixed in Samba.

Software Description:

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

Details:

It was discovered that Winbind incorrectly handled invalid group names with

the require_membership_of parameter. If an administrator used an invalid

group name by mistake, access was granted instead of having the login fail.

(CVE-2012-6150)

Stefan Metzmacher and Michael Adam discovered that Samba incorrectly

handled DCE-RPC fragment length fields. A remote attacker could use this

issue to cause Samba to crash, resulting in a denial of service, or

possibly execute arbitrary code as the root user. (CVE-2013-4408)

Hemanth Thummala discovered that Samba incorrectly handled file

permissions when vfs_streams_depot or vfs_streams_xattr were enabled. A

remote attacker could use this issue to bypass intended restrictions.

(CVE-2013-4475)

Topics Covered

security advisory denial of service critical issue samba access flaw ubuntu

Update Instructions

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

Ubuntu 13.10:
  libpam-winbind                  2:3.6.18-1ubuntu3.1
  samba                           2:3.6.18-1ubuntu3.1

Ubuntu 13.04:
  libpam-winbind                  2:3.6.9-1ubuntu1.2
  samba                           2:3.6.9-1ubuntu1.2

Ubuntu 12.10:
  libpam-winbind                  2:3.6.6-3ubuntu5.3
  samba                           2:3.6.6-3ubuntu5.3

Ubuntu 12.04 LTS:
  libpam-winbind                  2:3.6.3-2ubuntu2.9
  samba                           2:3.6.3-2ubuntu2.9

Ubuntu 10.04 LTS:
  samba                           2:3.4.7~dfsg-1ubuntu3.13
  winbind                         2:3.4.7~dfsg-1ubuntu3.13

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