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Vulnerability of Python plistlib: external XML entity injection

Synthesis of the vulnerability 

An attacker can transmit malicious XML data to Python plistlib, in order to read a file, scan sites, or trigger a denial of service.
Vulnerable systems: Python.
Severity of this threat: 2/4.
Creation date: 20/10/2020.
Références of this weakness: 42051, VIGILANCE-VUL-33626.

Description of the vulnerability 

An attacker can transmit malicious XML data to Python plistlib, in order to read a file, scan sites, or trigger a denial of service.
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This threat announce impacts software or systems such as Python.

Our Vigil@nce team determined that the severity of this cybersecurity alert is medium.

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

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

Python: version 3.9.1.
The version 3.9.1 is fixed:
  https://www.python.org/downloads/release/python-391/

Python: version 3.8.7.
The version 3.8.7 is fixed:
  https://www.python.org/downloads/release/python-391/

Python plistlib: patch for External Entities.
A patch is indicated in information sources.
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