samba -- nss_info plugin privilege escalation vulnerability

The Samba development team reports:

The idmap_ad.so library provides an nss_info extension to
Winbind for retrieving a user’s home directory path, login
shell and primary group id from an Active Directory domain
controller. This functionality is enabled by defining the
“winbind nss info” smb.conf option to either “sfu” or
“rfc2307”.
Both the Windows “Identity Management for Unix” and
“Services for Unix” MMC plug-ins allow a user to be assigned
a primary group for Unix clients that differs from the user’s
Windows primary group. When the rfc2307 or sfu nss_info plugin
has been enabled, in the absence of either the RFC2307 or SFU
primary group attribute, Winbind will assign a primary group ID
of 0 to the domain user queried using the getpwnam() C library
call.