An atftp security update has been released for Ubuntu Linux 16.04 LTS.

USN-4643-1: atftp vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4643-1
November 24, 2020

atftp vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

atftp could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- atftp: Advanced TFTP Server and Client

Details:

It was discovered that atftp's FTP server did not properly handler certain
input. An attacker could use this to to cause a denial of service (crash)
or possibly execute arbitrary code. (CVE-2019-11365)

It was discovered that atftp's FTP server did not make proper use of
mutexes when locking certain data structures. An attacker could use this to
cause a denial of service via a NULL pointer dereference. (CVE-2019-11366)

Update instructions:

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

Ubuntu 16.04 LTS:
atftp 0.7.git20120829-3.1~0.16.04.1
atftpd 0.7.git20120829-3.1~0.16.04.1

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

References:
  https://usn.ubuntu.com/4643-1
CVE-2019-11365, CVE-2019-11366

Package Information:
  https://launchpad.net/ubuntu/+source/atftp/0.7.git20120829-3.1~0.16.04.1