USN-4217-1: Samba vulnerabilities

10 December 2019

samba vulnerabilities

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

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Samba.

Software Description

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

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 19.10
libsmbclient - 2:4.10.7+dfsg-0ubuntu2.3
samba - 2:4.10.7+dfsg-0ubuntu2.3
Ubuntu 19.04
libsmbclient - 2:4.10.0+dfsg-0ubuntu2.7
samba - 2:4.10.0+dfsg-0ubuntu2.7
Ubuntu 18.04 LTS
libsmbclient - 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
Ubuntu 16.04 LTS
libsmbclient - 2:4.3.11+dfsg-0ubuntu0.16.04.24
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.24

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References