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

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

* CVE-2019-11365
* CVE-2019-11366

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