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Ubuntu Security Notice USN-2054-1

Ubuntu Security Notice USN-2054-1
Posted Dec 12, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2054-1 - 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, root
systems | linux, ubuntu
advisories | CVE-2012-6150, CVE-2013-4408, CVE-2013-4475, CVE-2012-6150, CVE-2013-4408, CVE-2013-4475
MD5 | e9325dca9b855c1fa91ba0da3bd26f0c

Ubuntu Security Notice USN-2054-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2054-1
December 11, 2013

samba vulnerabilities
============================================================================

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

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)

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.

References:
http://www.ubuntu.com/usn/usn-2054-1
CVE-2012-6150, CVE-2013-4408, CVE-2013-4475

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:3.6.18-1ubuntu3.1
https://launchpad.net/ubuntu/+source/samba/2:3.6.9-1ubuntu1.2
https://launchpad.net/ubuntu/+source/samba/2:3.6.6-3ubuntu5.3
https://launchpad.net/ubuntu/+source/samba/2:3.6.3-2ubuntu2.9
https://launchpad.net/ubuntu/+source/samba/2:3.4.7~dfsg-1ubuntu3.13

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