=========================================================================Ubuntu Security Notice USN-4038-1
June 26, 2019

bzip2 vulnerabilities
=========================================================================
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:

Several security issues were fixed in bzip2.

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

Details:

Aladdin Mubaied discovered that bzip2 incorrectly handled certain files.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 16.04 LTS. (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 19.04:
  bzip2                           1.0.6-9ubuntu0.19.04
  libbz2-1.0                      1.0.6-9ubuntu0.19.04

Ubuntu 18.10:
  bzip2                           1.0.6-9ubuntu0.18.10
  libbz2-1.0                      1.0.6-9ubuntu0.18.10

Ubuntu 18.04 LTS:
  bzip2                           1.0.6-8.1ubuntu0.1
  libbz2-1.0                      1.0.6-8.1ubuntu0.1

Ubuntu 16.04 LTS:
  bzip2                           1.0.6-8ubuntu0.1
  libbz2-1.0                      1.0.6-8ubuntu0.1

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

References:
  https://ubuntu.com/security/notices/USN-4038-1
  CVE-2016-3189, CVE-2019-12900

Package Information:
  https://launchpad.net/ubuntu/+source/bzip2/1.0.6-9ubuntu0.19.04
  https://launchpad.net/ubuntu/+source/bzip2/1.0.6-9ubuntu0.18.10
  https://launchpad.net/ubuntu/+source/bzip2/1.0.6-8.1ubuntu0.1
  https://launchpad.net/ubuntu/+source/bzip2/1.0.6-8ubuntu0.1