The following updates has been released for Ubuntu Linux:

USN-4038-2: bzip2 vulnerabilities
USN-4040-1: Expat vulnerability
USN-4040-2: Expat vulnerability

USN-4038-2: bzip2 vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4038-2
June 26, 2019

bzip2 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in bzip2.

Software Description:
- bzip2: high-quality block-sorting file compressor - utilities

Details:

USN-4038-1 fixed several vulnerabilities in bzip2. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

Aladdin Mubaied discovered that bzip2 incorrectly handled certain files.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2016-3189)

It was discovered that bzip2 incorrectly handled certain files.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-12900)

Update instructions:

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

Ubuntu 14.04 ESM:
bzip2 1.0.6-5ubuntu0.1~esm1
lib32bz2-1.0 1.0.6-5ubuntu0.1~esm1
lib64bz2-1.0 1.0.6-5ubuntu0.1~esm1
libbz2-1.0 1.0.6-5ubuntu0.1~esm1

Ubuntu 12.04 ESM:
bzip2 1.0.6-1ubuntu0.1
lib32bz2-1.0 1.0.6-1ubuntu0.1
lib64bz2-1.0 1.0.6-1ubuntu0.1
libbz2-1.0 1.0.6-1ubuntu0.1

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

References:
https://usn.ubuntu.com/4038-2
https://usn.ubuntu.com/4038-1
CVE-2016-3189, CVE-2019-12900

USN-4040-1: Expat vulnerability

=========================================================================
Ubuntu Security Notice USN-4040-1
June 26, 2019

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Expat could be made to consume a high amount of RAM and CPU resources
if it received a specially crafted XML file.

Software Description:
- expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled certain XML files.
An attacker could possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 19.04:
libexpat1 2.2.6-1ubuntu0.19.04

Ubuntu 18.10:
libexpat1 2.2.6-1ubuntu0.18.10

Ubuntu 18.04 LTS:
libexpat1 2.2.5-3ubuntu0.1

Ubuntu 16.04 LTS:
lib64expat1 2.1.0-7ubuntu0.16.04.4
libexpat1 2.1.0-7ubuntu0.16.04.4

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

References:
https://usn.ubuntu.com/4040-1
CVE-2018-20843

Package Information:
https://launchpad.net/ubuntu/+source/expat/2.2.6-1ubuntu0.19.04
https://launchpad.net/ubuntu/+source/expat/2.2.6-1ubuntu0.18.10
https://launchpad.net/ubuntu/+source/expat/2.2.5-3ubuntu0.1
https://launchpad.net/ubuntu/+source/expat/2.1.0-7ubuntu0.16.04.4

USN-4040-2: Expat vulnerability

=========================================================================
Ubuntu Security Notice USN-4040-2
June 26, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Expat could be made to consume a high amount of RAM and CPU
resources if it received a specially crafted XML file.

Software Description:
- expat: XML parsing C library

Details:

USN-4040-1 fixed a vulnerability in expat. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Expat incorrectly handled certain XML files.
An attacker could possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 14.04 ESM:
lib64expat1 2.1.0-4ubuntu1.4+esm1
libexpat1 2.1.0-4ubuntu1.4+esm1

Ubuntu 12.04 ESM:
lib64expat1 2.0.1-7.2ubuntu1.6
libexpat1 2.0.1-7.2ubuntu1.6

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

References:
https://usn.ubuntu.com/4040-2
https://usn.ubuntu.com/4040-1
CVE-2018-20843