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Vulnerability of Flask-CORS: directory traversal

Synthesis of the vulnerability 

An attacker can traverse directories of Flask-CORS, in order to read a file outside the service root path.
Vulnerable products: Debian, openSUSE Leap, SLES.
Severity of this weakness: 2/4.
Creation date: 09/09/2020.
Références of this bulletin: CVE-2020-25032, DSA-4775-1, openSUSE-SU-2020:1393-1, openSUSE-SU-2020:1415-1, openSUSE-SU-2020:1423-1, openSUSE-SU-2020:1446-1, VIGILANCE-VUL-33288.

Description of the vulnerability 

An attacker can traverse directories of Flask-CORS, in order to read a file outside the service root path.
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This threat bulletin impacts software or systems such as Debian, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer threat bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer threat.

Solutions for this threat 

Debian 10: new python-flask-cors packages.
New packages are available:
  Debian 10: python-flask-cors 3.0.7-1+deb10u1

openSUSE Leap 15: new python-Flask-Cors packages.
New packages are available:
  openSUSE Leap 15.2: python2-Flask-Cors 3.0.8-lp152.2.3.1, python3-Flask-Cors 3.0.8-lp152.2.3.1
  openSUSE Leap 15.1: python2-Flask-Cors 3.0.7-lp151.2.3.1, python3-Flask-Cors 3.0.7-lp151.2.3.1

SUSE LE 15 SP1: new python-Flask-Cors packages.
New packages are available:
  SUSE LE 15 SP1: python2-Flask-Cors 3.0.7-bp151.2.3.1, python3-Flask-Cors 3.0.7-bp151.2.3.1

SUSE LE 15 SP2: new python-Flask-Cors packages.
New packages are available:
  SUSE LE 15 SP2: python2-Flask-Cors 3.0.8-bp152.2.3.1, python2-Flask-Cors 3.0.8-bp152.2.4.1, python3-Flask-Cors 3.0.8-bp152.2.3.1, python3-Flask-Cors 3.0.8-bp152.2.4.1
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