CVE-2019-9942

Existe una divulgación de información del sandbox en Twig, en versiones anteriores a la 1.38.0 y versiones 2.x anteriores a la 2.7.0 ya que, en ciertas circunstancias, es posible llamar al método __toString() en un objeto incluso aunque la política de seguridad existente no lo permita.

Fabien Potencier discovered that Twig was not properly enforcing sandbox policies when dealing with objects automatically cast to strings by PHP. An attacker could possibly use this issue to expose sensitive information. This issue was only fixed in Ubuntu 16.04 ESM and Ubuntu 18.04 ESM. Marlon Starkloff discovered that Twig was not properly enforcing closure constraints in some of its array filtering functions. An attacker could possibly use this issue to execute arbitrary code. This issue was only fixed in Ubuntu 20.04 ESM.