The following updates has been released for Ubuntu Linux:

USN-4073-1: libEBML vulnerability
USN-4074-1: VLC vulnerabilities

USN-4073-1: libEBML vulnerability

==========================================================================
Ubuntu Security Notice USN-4073-1
July 25, 2019

libebml vulnerability
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libEBML could be made to crash if it opened a specially crafted file.

Software Description:
- libebml: library for the EBML format

Details:

It was discovered that libEBML incorrectly handled certain media files. If
a user were tricked into opening a specially crafted media file, libEBML
could possibly be made to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 18.04 LTS:
libebml4v5 1.3.5-2ubuntu0.1

Ubuntu 16.04 LTS:
libebml4v5 1.3.3-1ubuntu0.1

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

References:
https://usn.ubuntu.com/4073-1
CVE-2019-13615

Package Information:
https://launchpad.net/ubuntu/+source/libebml/1.3.5-2ubuntu0.1
https://launchpad.net/ubuntu/+source/libebml/1.3.3-1ubuntu0.1

USN-4074-1: VLC vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4074-1
July 25, 2019

vlc vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in VLC.

Software Description:
- vlc: multimedia player and streamer

Details:

It was discovered that the VLC CAF demuxer incorrectly handled certain
files. If a user were tricked into opening a specially-crafted CAF file, a
remote attacker could use this issue to cause VLC to crash, resulting in a
denial of service. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-19857)

It was discovered that the VLC Matroska demuxer incorrectly handled certain
files. If a user were tricked into opening a specially-crafted MKV file, a
remote attacker could use this issue to cause VLC to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-12874)

It was discovered that the VLC MP4 demuxer incorrectly handled certain
files. If a user were tricked into opening a specially-crafted MP4 file, a
remote attacker could use this issue to cause VLC to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-13602)

It was discovered that the VLC AVI demuxer incorrectly handled certain
files. If a user were tricked into opening a specially-crafted AVI file, a
remote attacker could use this issue to cause VLC to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-5439)

Update instructions:

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

Ubuntu 19.04:
vlc 3.0.7.1-0ubuntu19.04.1

Ubuntu 18.04 LTS:
vlc 3.0.7.1-0ubuntu18.04.1

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

References:
https://usn.ubuntu.com/4074-1
CVE-2018-19857, CVE-2019-12874, CVE-2019-13602, CVE-2019-5439

Package Information:
https://launchpad.net/ubuntu/+source/vlc/3.0.7.1-0ubuntu19.04.1
https://launchpad.net/ubuntu/+source/vlc/3.0.7.1-0ubuntu18.04.1