Ubuntu 18.10: USN-3827-1 Critical Samba Denial of Service Issues

ubuntu

November 27, 2018

Several security issues were fixed in Samba.

Summary

Several security issues were fixed in Samba.

Software Description:

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

Details:

Florian Stuelpner discovered that Samba incorrectly handled CNAME records.

A remote attacker could use this issue to cause Samba to crash, resulting

in a denial of service. (CVE-2018-14629)

Alex MacCuish discovered that Samba incorrectly handled memory when

configured to accept smart-card authentication. A remote attacker could

possibly use this issue to cause Samba to crash, resulting in a denial of

service. (CVE-2018-16841)

Garming Sam discovered that Samba incorrectly handled memory when

processing LDAP searches. A remote attacker could possibly use this issue

to cause Samba to crash, resulting in a denial of service. (CVE-2018-16851)

Topics Covered

security advisory denial of service Ubuntu update instructions memory issue Samba

Update Instructions

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

Ubuntu 18.10:
  samba                           2:4.8.4+dfsg-2ubuntu2.1

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.5

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.18

Ubuntu 14.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.19

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