USN-3353-2: Samba vulnerability

Releases

• Ubuntu 17.04
• Ubuntu 16.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• samba - SMB/CIFS file, print, and login server for Unix

Details

USN-3353-1 fixed a vulnerability in Heimdal. This update provides
the corresponding update for Samba.

Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams discovered
that Samba clients incorrectly trusted unauthenticated portions of
Kerberos tickets. A remote attacker could use this to impersonate
trusted network servers or perform other attacks.

Update instructions

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

Ubuntu 17.04

• samba-libs - 2:4.5.8+dfsg-0ubuntu0.17.04.4

Ubuntu 16.10

• samba-libs - 2:4.4.5+dfsg-2ubuntu5.8

Ubuntu 16.04

• samba-libs - 2:4.3.11+dfsg-0ubuntu0.16.04.9

Ubuntu 14.04

• samba-libs - 2:4.3.11+dfsg-0ubuntu0.14.04.10

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

References

• CVE-2017-11103

Related notices

• USN-3353-4: libsmbclient, samba
• USN-3353-1: libheimbase1-heimdal, heimdal-clients, libhcrypto4-heimdal, libgssapi3-heimdal, libhx509-5-heimdal, libkadm5clnt7-heimdal, libroken18-heimdal, heimdal-kdc, libasn1-8-heimdal, heimdal-servers, libkdc2-heimdal, libkadm5srv8-heimdal, libkafs0-heimdal, heimdal-clients-x, libwind0-heimdal, libotp0-heimdal, heimdal, heimdal-servers-x, libheimntlm0-heimdal, libhdb9-heimdal, libkrb5-26-heimdal, heimdal-kcm, heimdal-multidev, heimdal-docs, libsl0-heimdal, heimdal-dev
• USN-3353-3: heimdal, libkrb5-26-heimdal