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Ubuntu Security Notice USN-3426-2
November 02, 2017

samba vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in XXX-APP-XXX.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

USN-3426-1 fixed several vulnerabilities in Samba. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Stefan Metzmacher discovered that Samba incorrectly enforced SMB
 signing in certain situations. A remote attacker could use this issue
 to perform a man in the middle attack. (CVE-2017-12150)

 Yihan Lian and Zhibin Hu discovered that Samba incorrectly handled
 memory when SMB1 is being used. A remote attacker could possibly use
 this issue to obtain server memory contents. (CVE-2017-12163)

Update instructions:

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

Ubuntu 12.04 ESM:
  samba                           2:3.6.25-0ubuntu0.12.04.13

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

References:
  https://www.ubuntu.com/usn/usn-3426-2
  https://www.ubuntu.com/usn/usn-3426-1
  CVE-2017-12150, CVE-2017-12163