=========================================================================
Ubuntu Security Notice USN-4568-1
October 05, 2020

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Brotli could be made to crash if it received a specially crafted
input.

Software Description:
- brotli: lossless compression algorithm and format (command line utility)

Details:

It was discovered that Brotli incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a crash.

Update instructions:

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

Ubuntu 20.04 LTS:
  brotli                          1.0.7-6ubuntu0.1
  libbrotli1                      1.0.7-6ubuntu0.1
  python3-brotli                  1.0.7-6ubuntu0.1

Ubuntu 18.04 LTS:
  brotli                          1.0.3-1ubuntu1.3
  libbrotli1                      1.0.3-1ubuntu1.3
  python-brotli                   1.0.3-1ubuntu1.3
  python3-brotli                  1.0.3-1ubuntu1.3

Ubuntu 16.04 LTS:
  brotli                          1.0.3-1ubuntu1~16.04.2
  libbrotli1                      1.0.3-1ubuntu1~16.04.2
  python-brotli                   1.0.3-1ubuntu1~16.04.2
  python3-brotli                  1.0.3-1ubuntu1~16.04.2

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

References:
  https://usn.ubuntu.com/4568-1
  CVE-2020-8927

Package Information:
  https://launchpad.net/ubuntu/+source/brotli/1.0.7-6ubuntu0.1
  https://launchpad.net/ubuntu/+source/brotli/1.0.3-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/brotli/1.0.3-1ubuntu1~16.04.2