CVE-2019-10208

Se descubrió un fallo en postgresql versiones 9.4.x en versiones anteriores a la 9.4.24, versiones 9.5.x en versiones anteriores a la 9.5.19, versiones 9.6.x en versiones anteriores a la 9.6.15, versiones 10.x en versiones anteriores a la 10.10 y versiones 11.x en versiones anteriores a la 11.5 donde pueden ser ejecutadas sentencias SQL arbitrarias dada una función SECURITY DEFINER adecuada. Un atacante, con permiso EXECUTE sobre la función, puede ejecutar código SQL arbitrario como propietario de la función.

A flaw was discovered in postgresql where arbitrary SQL statements can be executed given a suitable SECURITY DEFINER function. An attacker, with EXECUTE permission on the function, can execute arbitrary SQL as the owner of the function.

Tom Lane discovered that PostgreSQL did not properly restrict functions declared as "SECURITY DEFINER". An attacker could use this to execute arbitrary SQL with the permissions of the function owner. Andreas Seltenreich discovered that PostgreSQL did not properly handle user-defined hash equality operators. An attacker could use this to expose sensitive information. This issue only affected Ubuntu 19.04. Various other issues were also addressed.