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Vulnerability of Symfony: information disclosure via Switch User Enumeration

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Switch User Enumeration of Symfony, in order to obtain sensitive information.
Impacted software: Debian, Symfony.
Severity of this computer vulnerability: 2/4.
Creation date: 13/11/2019.
Références of this announce: CVE-2019-18886, DLA-1999-1, VIGILANCE-VUL-30862.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Switch User Enumeration of Symfony, in order to obtain sensitive information.
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This security alert impacts software or systems such as Debian, Symfony.

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

Solutions for this threat 

Symfony: version 4.3.8.
The version 4.3.8 is fixed:
  https://symfony.com/download

Symfony: version 4.2.12.
The version 4.2.12 is fixed:
  https://symfony.com/download

Debian 8: new symfony packages.
New packages are available:
  Debian 8: symfony 2.3.21+dfsg-4+deb8u6
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