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USN-2054-1: Samba vulnerabilities

11 December 2013

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.

Update instructions

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

Ubuntu 13.10
Ubuntu 13.04
Ubuntu 12.10
Ubuntu 12.04
Ubuntu 10.04

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