[USN-6019-1] Flask-CORS vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-6019-1
April 13, 2023

python-flask-cors vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

Applications using Flask-CORS could be made to expose sensitive
information.

Software Description:
- python-flask-cors: Flask extension for handling Cross Origin Resource Sharing (CORS)

Details:

It was discovered that Flask-CORS did not properly escape paths before
evaluating resource rules. An attacker could possibly use this to
expose sensitive information.

Update instructions:

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

Ubuntu 20.04 LTS:
  python3-flask-cors              3.0.8-2ubuntu0.1

After a standard system update you need to restart application using
Flask-CORS to make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-6019-1
  CVE-2020-25032

Package Information:
  https://launchpad.net/ubuntu/+source/python-flask-cors/3.0.8-2ubuntu0.1

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