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

bzip2 vulnerabilities
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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