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Ubuntu Security Notice USN-4540-1
September 24, 2020

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

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in atftpd.

Software Description:
- atftp: Advanced TFTP Server and Client

Details:

Denis Andzakovic discovered that atftpd incorrectly handled certain
malformed packets. A remote attacker could send a specially crafted packet
to cause atftpd to crash, resulting in a denial of service.
(CVE-2019-11365)

Denis Andzakovic discovered that atftpd did not properly lock the thread
list mutex. An attacker could send a large number of tftpd packets
simultaneously when running atftpd in daemon mode to cause atftpd to
crash, resulting in a denial of service. (CVE-2019-11366)

Update instructions:

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

Ubuntu 18.04 LTS:
  atftpd                          0.7.git20120829-3.1~0.18.04.1

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

References:
  https://usn.ubuntu.com/4540-1
  CVE-2019-11365, CVE-2019-11366

Package Information:
  https://launchpad.net/ubuntu/+source/atftp/0.7.git20120829-3.1~0.18.04.1