CVE-2016-9933

Vulnerabilidad de consumo de pila en la función gdImageFillToBorder en gd.c en la GD Graphics Library (también conocida como libgd) en versiones anteriores a 2.2.2, como se utiliza en PHP en versiones anteriores a 5.6.28 y 7.x en versiones anteriores a 7.0.13, permite a atacantes remotos provocar una denegación de servicio (violación de segmentación) a través de una llamada imagefilltoborder manipulada que desencadena el uso de un valor de color negativo.

An infinite recursion flaw was found in the gdImageFillToBorder() function from the gd library; also used by PHP imagefilltoborder() function, when passing a negative integer as the color parameter, triggering a stack overflow. A remote attacker with ability to force a negative color identifier when calling the function could crash the PHP application, causing a Denial of Service.

Stefan Esser discovered that the GD library incorrectly handled memory when processing certain images. If a user or automated system were tricked into processing a specially crafted image, an attacker could cause a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. It was discovered that the GD library incorrectly handled certain malformed images. If a user or automated system were tricked into processing a specially crafted image, an attacker could cause a denial of service. Various other issues were also addressed.