The following two updates has been released for Ubuntu Linux:

USN-4155-1: Aspell vulnerability
USN-4156-1: SDL vulnerabilities

USN-4155-1: Aspell vulnerability

=========================================================================
Ubuntu Security Notice USN-4155-1
October 15, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Aspell could be made to expose sensitive information if it received
a specially crafted input.

Software Description:
- aspell: GNU Aspell spell-checker

Details:

It was discovered that Aspell incorrectly handled certain inputs.
An attacker could potentially access sensitive information.

Update instructions:

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

Ubuntu 19.04:
aspell 0.60.7~20110707-6ubuntu0.1
libaspell15 0.60.7~20110707-6ubuntu0.1

Ubuntu 18.04 LTS:
aspell 0.60.7~20110707-4ubuntu0.1
libaspell15 0.60.7~20110707-4ubuntu0.1

Ubuntu 16.04 LTS:
aspell 0.60.7~20110707-3ubuntu0.1
libaspell15 0.60.7~20110707-3ubuntu0.1

Ubuntu 14.04 ESM:
aspell 0.60.7~20110707-1ubuntu1+esm1
libaspell15 0.60.7~20110707-1ubuntu1+esm1

Ubuntu 12.04 ESM:
aspell 0.60.7~20110707-1ubuntu0.1
libaspell15 0.60.7~20110707-1ubuntu0.1

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

References:
https://usn.ubuntu.com/4155-1
CVE-2019-17544

Package Information:
https://launchpad.net/ubuntu/+source/aspell/0.60.7~20110707-6ubuntu0.1
https://launchpad.net/ubuntu/+source/aspell/0.60.7~20110707-4ubuntu0.1
https://launchpad.net/ubuntu/+source/aspell/0.60.7~20110707-3ubuntu0.1

USN-4156-1: SDL vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4156-1
October 15, 2019

libsdl1.2 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in SDL.

Software Description:
- libsdl1.2: Simple DirectMedia Layer

Details:

It was discovered that SDL incorrectly handled certain images. If a user
were tricked into opening a crafted image file, a remote attacker could
use this issue to cause SDL to crash, resulting in a denial of service, or
possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
libsdl1.2debian 1.2.15+dfsg2-0.1ubuntu0.1

Ubuntu 16.04 LTS:
libsdl1.2debian 1.2.15+dfsg1-3ubuntu0.1

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

References:
https://usn.ubuntu.com/4156-1
CVE-2019-13616, CVE-2019-7572, CVE-2019-7573, CVE-2019-7574,
CVE-2019-7575, CVE-2019-7576, CVE-2019-7577, CVE-2019-7578,
CVE-2019-7635, CVE-2019-7636, CVE-2019-7637, CVE-2019-7638

Package Information:
https://launchpad.net/ubuntu/+source/libsdl1.2/1.2.15+dfsg2-0.1ubuntu0.1
https://launchpad.net/ubuntu/+source/libsdl1.2/1.2.15+dfsg1-3ubuntu0.1