[USN-4378-1] Flask vulnerability

Leonidas S. Barbosa leo.barbosa at canonical.com
Mon Jun 1 16:05:07 UTC 2020

Ubuntu Security Notice USN-4378-1
June 01, 2020

flask vulnerability

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM


Flask could be made to consume a large amount of memory if it
received a specially crafted input.

Software Description:
- flask: Micro web framework based on Werkzeug and Jinja2


It was discovered that Flask incorrectly handled certain inputs.
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 18.04 LTS:
  python-flask                    0.12.2-3ubuntu0.1
  python3-flask                   0.12.2-3ubuntu0.1

Ubuntu 16.04 LTS:
  python-flask                    0.10.1-2ubuntu0.1
  python3-flask                   0.10.1-2ubuntu0.1

Ubuntu 14.04 ESM:
  python-flask                    0.10.1-2ubuntu0.1~esm1
  python3-flask                   0.10.1-2ubuntu0.1~esm1

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


Package Information:
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