Ubuntu Security Notice 882-1 – Maksymilian Arciemowicz discovered that PHP did not properly handle the ini_restore function. An attacker could exploit this issue to obtain random memory contents or to cause the PHP server to crash, resulting in a denial of service. It was discovered that the htmlspecialchars function did not properly handle certain character sequences, which could result in browsers becoming vulnerable to cross-site scripting attacks when processing the output. With cross-site scripting vulnerabilities, if a user were tricked into viewing server output during a crafted server request, a remote attacker could exploit this to modify the contents, or steal confidential data (such as passwords), within the same domain. Stefan Esser discovered that PHP did not properly handle session data. An attacker could exploit this issue to bypass safe_mode or open_basedir restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/85074/USN-882-1.txt
Source: https://packetstormsecurity.com/files/85074/Ubuntu-Security-Notice-882-1.html