The following updates has been released for Ubuntu Linux:

USN-4108-1: Zstandard vulnerability
USN-4109-1: OpenJPEG vulnerabilities

USN-4108-1: Zstandard vulnerability

=========================================================================
Ubuntu Security Notice USN-4108-1
August 21, 2019

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

- Ubuntu 18.04 LTS

Summary:

Zstandard could be made to execute arbitrary code if it received
specially crafted input.

Software Description:
- libzstd: fast lossless compression algorithm -- development files

Details:

It was discovered that Zstandard incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
libzstd1 1.3.3+dfsg-2ubuntu1.1
zstd 1.3.3+dfsg-2ubuntu1.1

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

References:
https://usn.ubuntu.com/4108-1
CVE-2019-11922

Package Information:
https://launchpad.net/ubuntu/+source/libzstd/1.3.3+dfsg-2ubuntu1.1

USN-4109-1: OpenJPEG vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4109-1
August 21, 2019

openjpeg2 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in OpenJPEG.

Software Description:
- openjpeg2: JPEG 2000 image compression/decompression library

Details:

It was discovered that OpenJPEG incorrectly handled certain PGX files. An
attacker could possibly use this issue to cause a denial of service or possibly
remote code execution. (CVE-2017-17480)

It was discovered that OpenJPEG incorrectly handled certain files. An attacker
could possibly use this issue to cause a denial of service. (CVE-2018-14423)

It was discovered that OpenJPEG incorrectly handled certain PNM files. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2018-18088)

It was discovered that OpenJPEG incorrectly handled certain BMP files. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2018-5785, CVE-2018-6616)

Update instructions:

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

Ubuntu 18.04 LTS:
libopenjp2-7 2.3.0-2build0.18.04.1
libopenjp3d7 2.3.0-2build0.18.04.1
libopenjpip7 2.3.0-2build0.18.04.1

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

References:
https://usn.ubuntu.com/4109-1
CVE-2017-17480, CVE-2018-14423, CVE-2018-18088, CVE-2018-5785,
CVE-2018-6616

Package Information:
https://launchpad.net/ubuntu/+source/openjpeg2/2.3.0-2build0.18.04.1