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Vulnerability of Python ftplib: information disclosure via PASV Response Host Scan

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via PASV Response Host Scan of Python ftplib, in order to obtain sensitive information.
Vulnerable systems: Python.
Severity of this threat: 2/4.
Creation date: 16/03/2021.
Références of this weakness: 43285, VIGILANCE-VUL-34856.

Description of the vulnerability 

An attacker can bypass access restrictions to data via PASV Response Host Scan of Python ftplib, in order to obtain sensitive information.
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This computer vulnerability impacts software or systems such as Python.

Our Vigil@nce team determined that the severity of this weakness 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 weakness.

Solutions for this threat 

Python: version 3.9.3.
The version 3.9.3 is fixed:
  https://www.python.org/downloads/release/python-393/

Python: version 3.8.9.
The version 3.8.9 is fixed:
  https://www.python.org/downloads/release/python-389/

Python ftplib: patch for PASV Response Host Scan.
A patch is indicated in information sources.
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