Ubuntu Security Notice USN-3092-1
28th September, 2016
samba vulnerability
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary
Samba could be tricked into connecting to impersonated servers.
Software description
- samba
– SMB/CIFS file, print, and login server for Unix
Details
Stefan Metzmacher discovered that Samba incorrectly handled certain flags
in SMB2/3 client connections. A remote attacker could use this issue to
disable client signing and impersonate servers by performing a man in the
middle attack.
Samba has been updated to 4.3.11 in Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
In addition to the security fix, the updated packages contain bug fixes,
new features, and possibly incompatible changes.
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 16.04 LTS:
-
samba
2:4.3.11+dfsg-0ubuntu0.16.04.1
- Ubuntu 14.04 LTS:
-
samba
2:4.3.11+dfsg-0ubuntu0.14.04.1
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.