CVE-2017-9048

En libxml2 versión 20904-GITv2.9.4-16-g0741801 es vulnerable a un desbordamiento de búfer en la región stack de la memoria. La función xmlSnprintfElementContent en el archivo valid.c debe volcar recursivamente la definición del contenido del elemento en un búfer de caracteres 'buf' de tamaño 'tamaño'. Al final de la rutina, la función puede representar dos caracteres más sin comprobar si el actual strlen(buf) + 2 es menor que size. Esta vulnerabilidad causa que los programas que usan libxml2, como PHP, se bloqueen.

Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause a denial-of-service against the application, information leaks, or potentially, the execution of arbitrary code with the privileges of the user running the application. For the oldstable distribution (jessie), these problems have been fixed in version 2.9.1+dfsg1-5+deb8u5. For the stable distribution (stretch), these problems have been fixed in version 2.9.4+dfsg1-2.2+deb9u1. For the unstable distribution (sid), these problems have been fixed in version 2.9.4+dfsg1-3.1.