Ubuntu Security Notice USN-4510-2
September 17, 2020
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.04 ESM
Samba would allow unintended access to files over the network.
– samba: SMB/CIFS file, print, and login server for Unix
USN-4510-1 fixed a vulnerability in Samba. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
Tom Tervoort discovered that the Netlogon protocol implemented by Samba
incorrectly handled the authentication scheme. A remote attacker could use
this issue to forge an authentication token and steal the credentials of
the domain admin.
This update fixes the issue by changing the “server schannel” setting to
default to “yes”, instead of “auto”, which will force a secure netlogon
channel. This may result in compatibility issues with older devices. A
future update may allow a finer-grained control over this setting.
The problem can be corrected by updating your system to the following
Ubuntu 14.04 ESM:
In general, a standard system update will make all the necessary changes.