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Ubuntu Security Notice USN-4217-2
December 11, 2019

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

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Samba.

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

Details:

USN-4217-1 fixed several vulnerabilities in Samba. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

 Andreas Oster discovered that the Samba DNS management server incorrectly
 handled certain records. An authenticated attacker could possibly use this
 issue to crash Samba, resulting in a denial of service. (CVE-2019-14861)

 Isaac Boukris discovered that Samba did not enforce the Kerberos
 DelegationNotAllowed feature restriction, contrary to expectations.
 (CVE-2019-14870)

Update instructions:

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

Ubuntu 14.04 ESM:
  libsmbclient                    2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4

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

References:
  https://usn.ubuntu.com/4217-2
  https://usn.ubuntu.com/4217-1
  CVE-2019-14861, CVE-2019-14870