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Ubuntu Security Notice USN-4038-4

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Ubuntu Security Notice USN-4038-4
July 04, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

USN-4038-1 introduced a regression in bzip2.

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

Details:

USN-4038-1 fixed a vulnerability in bzip2. The update introduced
a regression causing bzip2 to incorrect raises CRC errors for some
files. This update provides the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

We apologize for the inconvenience.

Original advisory details:

It was discovered that bzip2 incorrectly handled certain files.
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 14.04 ESM:
bzip2 1.0.6-5ubuntu0.1~esm2
lib32bz2-1.0 1.0.6-5ubuntu0.1~esm2
lib64bz2-1.0 1.0.6-5ubuntu0.1~esm2
libbz2-1.0 1.0.6-5ubuntu0.1~esm2

Ubuntu 12.04 ESM:
bzip2 1.0.6-1ubuntu0.2
lib32bz2-1.0 1.0.6-1ubuntu0.2
lib64bz2-1.0 1.0.6-1ubuntu0.2
libbz2-1.0 1.0.6-1ubuntu0.2

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

References:
https://usn.ubuntu.com/4038-4
https://usn.ubuntu.com/4038-1
https://launchpad.net/bugs/1834494

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