Ubuntu Security Notice USN-2054-1
11th December, 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 13.10
- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS
Several security issues were fixed in Samba.
- samba - SMB/CIFS file, print, and login server for Unix
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.
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.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 13.10:
- samba 2:3.6.18-1ubuntu3.1
- libpam-winbind 2:3.6.18-1ubuntu3.1
- Ubuntu 13.04:
- samba 2:3.6.9-1ubuntu1.2
- libpam-winbind 2:3.6.9-1ubuntu1.2
- Ubuntu 12.10:
- samba 2:3.6.6-3ubuntu5.3
- libpam-winbind 2:3.6.6-3ubuntu5.3
- Ubuntu 12.04 LTS:
- samba 2:3.6.3-2ubuntu2.9
- libpam-winbind 2:3.6.3-2ubuntu2.9
- Ubuntu 10.04 LTS:
- winbind 2:3.4.7~dfsg-1ubuntu3.13
- samba 2:3.4.7~dfsg-1ubuntu3.13
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.