CVE-2011-1072

El instalador de PEAR en versiones anteriores a la 1.9.2 permite a usuarios locales sobreescribir ficheros de su elección a través de un ataque de enlace simbólico ("symlink attack") en el fichero package.xml. Relacionado con los directorios (1) download_dir, (2) cache_dir, (3) tmp_dir y (4) pear-build-download. Una vulnerabilidad distinta a la CVE-2007-2519.

Stephane Chazelas discovered that the /etc/cron.d/php5 cron job for PHP 5.3.5 allows local users to delete arbitrary files via a symlink attack on a directory under /var/lib/php5/. Raphael Geisert and Dan Rosenberg discovered that the PEAR installer allows local users to overwrite arbitrary files via a symlink attack on the package.xml file. Martin Barbella discovered a buffer overflow in the PHP GD extension that allows an attacker to cause a denial of service (application crash) via a large number of anti-aliasing steps in an argument to the imagepstext function. It was discovered that PHP accepts the \0 character in a pathname, which might allow an attacker to bypass intended access restrictions by placing a safe file extension after this character. Various other issues with PHP 5 were also identified and resolved.