Critical PHP vulnerability being fixed (The H) [LWN.net]

The H is reporting that a critical remote code execution bug has been found in PHP that was caused by the recent fix for the widespread denial of service via hash collisions vulnerability. "The cause of the problem is the security update to PHP 5.3.9, which was written to prevent denial of service (DoS) attacks using hash collisions. To do so, the developers limited the maximum possible number of input parameters to 1,000 in php_variables.c using max_input_vars. Because of mistakes in the implementation, hackers can intentionally exceed this limit and inject and execute code. The bug is considered to be critical as code can be remotely injected over the web."

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