CVE-2014-0191

La función xmlParserHandlePEReference en parser.c en libxml2 en versiones anteriores a 2.9.2, como se utiliza en Web Listener en Oracle HTTP Server en Oracle Fusion Middleware 11.1.1.7.0, 12.1.2.0 y 12.1.3.0 y otros productos, carga entidades de parámetro externas independientemente de si la sustitución de entidad o la validación están habilitadas, lo que permite a atacantes remotos causar una denegación de servicio (consumo de recursos) a través de un documento XML manipulado.

It was discovered that libxml2 loaded external parameter entities even when entity substitution was disabled. A remote attacker able to provide a specially crafted XML file to an application linked against libxml2 could use this flaw to conduct XML External Entity (XXE) attacks, possibly resulting in a denial of service or an information leak on the system.

It was discovered that libxml2, a library providing support to read, modify and write XML files, incorrectly performs entity substitution in the doctype prolog, even if the application using libxml2 disabled any entity substitution. A remote attacker could provide a specially-crafted XML file that, when processed, would lead to the exhaustion of CPU and memory resources or file descriptors. A denial of service flaw was found in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, would lead to excessive CPU consumption based on excessive entity substitutions, even if entity substitution was disabled, which is the parser default behavior.