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Vulnerability of Symfony: information disclosure via UriSigner Time Comparison

Synthesis of the vulnerability

An attacker can bypass access restrictions to data via UriSigner Time Comparison of Symfony, in order to obtain sensitive information.
Severity of this alert: 2/4.
Creation date: 13/11/2019.
Références of this alert: CVE-2019-18887, DLA-1999-1, DSA-4573-1, FEDORA-2019-5ae4fd9203, FEDORA-2019-8b0ba02338, FEDORA-2019-9c2ad3b018, VIGILANCE-VUL-30863.

Description of the vulnerability

An attacker can bypass access restrictions to data via UriSigner Time Comparison of Symfony, in order to obtain sensitive information.
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This vulnerability announce impacts software or systems such as Debian, eZ Platform, Fedora, Symfony.

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

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

Symfony: version 3.4.35.
The version 3.4.35 is fixed:
  https://symfony.com/download

Symfony: version 2.8.52.
The version 2.8.52 is fixed:
  https://symfony.com/download

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

Debian 9/10: new symfony packages.
New packages are available:
  Debian 9: symfony 2.8.7+dfsg-1.3+deb9u3
  Debian 10: symfony 3.4.22+dfsg-2+deb10u1

eZ Systems eZ Platform: version 2.5.7.
The version 2.5.7 is fixed:
  https://github.com/ezsystems/ezplatform-ee/releases/tag/v2.5.7

Fedora 31: new php-symfony3 packages.
New packages are available:
  Fedora 31: php-symfony3 3.4.35-2.fc31

Fedora: new php-symfony packages.
New packages are available:
  Fedora 30: php-symfony 2.8.52-1.fc30
  Fedora 31: php-symfony 2.8.52-1.fc31
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