PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Server. Security Fix: * It was discovered that PHP did not properly protect against the HTTP_PROXY variable name clash. A remote attacker could possibly use this flaw to redirect HTTP requests performed by a PHP script to an attacker-controlled proxy via a malicious HTTP request. Red Hat would like to thank Scott Geary for reporting this issue. Bug Fix: * Previously, an incorrect logic in the SAPI header callback routine caused that the callback counter was not incremented. Consequently, when a script included a header callback, it could terminate unexpectedly with a segmentation fault. With this update, the callback counter is properly managed, and scripts with a header callback implementation work as expected.