USN-2054-1: Samba vulnerabilities

Releases

• Ubuntu 13.10
• Ubuntu 13.04
• Ubuntu 12.10
• Ubuntu 12.04
• Ubuntu 10.04

Packages

• 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)

Update instructions

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

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

• samba - 2:3.6.3-2ubuntu2.9
• libpam-winbind - 2:3.6.3-2ubuntu2.9

Ubuntu 10.04

• winbind - 2:3.4.7~dfsg-1ubuntu3.13
• samba - 2:3.4.7~dfsg-1ubuntu3.13

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

References

• CVE-2012-6150
• CVE-2013-4408
• CVE-2013-4475