=========================================================================Ubuntu Security Notice USN-4611-1
November 02, 2020
samba vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- 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:
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
samba 2:4.12.5+dfsg-3ubuntu4.1
Ubuntu 20.04 LTS:
samba 2:4.11.6+dfsg-0ubuntu1.6
Ubuntu 18.04 LTS:
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.21
Ubuntu 16.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.16.04.32
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4611-1
CVE-2020-14318, CVE-2020-14323, CVE-2020-14383
Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.12.5+dfsg-3ubuntu4.1
https://launchpad.net/ubuntu/+source/samba/2:4.11.6+dfsg-0ubuntu1.6
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.21
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.32
