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Vulnerability of Symfony: information disclosure via ErrorHandler

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via ErrorHandler of Symfony, in order to obtain sensitive information.
Vulnerable systems: Symfony.
Severity of this threat: 2/4.
Creation date: 31/03/2020.
Références of this weakness: CVE-2020-5274, VIGILANCE-VUL-31910.

Description of the vulnerability 

An attacker can bypass access restrictions to data via ErrorHandler of Symfony, in order to obtain sensitive information.
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This threat announce impacts software or systems such as Symfony.

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 internet client.

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

Solutions for this threat 

Symfony: version 5.0.4.
The version 5.0.4 is fixed:
  https://github.com/symfony/symfony/

Symfony: version 4.4.4.
The version 4.4.4 is fixed:
  https://github.com/symfony/symfony/

Symfony: patch for ErrorHandler.
A patch is indicated in information sources.
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