| --TEST-- | |
| Bug #70284 (Use after free vulnerability in unserialize() with GMP) | |
| --EXTENSIONS-- | |
| gmp | |
| --FILE-- | |
| $inner = 'r:2;a:1:{i:0;a:1:{i:0;r:4;}}'; | |
| $exploit = 'a:2:{i:0;s:1:"1";i:1;C:3:"GMP":'.strlen($inner).':{'.$inner.'}}'; | |
| $data = unserialize($exploit); | |
| $fakezval = ptr2str(1122334455); | |
| $fakezval .= ptr2str(0); | |
| $fakezval .= "\x00\x00\x00\x00"; | |
| $fakezval .= "\x01"; | |
| $fakezval .= "\x00"; | |
| $fakezval .= "\x00\x00"; | |
| for ($i = 0; $i < 5; $i++) { | |
| $v[$i] = $fakezval.$i; | |
| } | |
| var_dump($data); | |
| function ptr2str($ptr) | |
| { | |
| $out = ''; | |
| for ($i = 0; $i < 8; $i++) { | |
| $out .= chr($ptr & 0xff); | |
| $ptr >>= 8; | |
| } | |
| return $out; | |
| } | |
| --EXPECTF-- | |
| Fatal error: Uncaught Exception: Could not unserialize number in %sbug70284.php:6 | |
| Stack trace: | |
| #0 %sbug70284.php(6): unserialize('%s') | |
| #1 {main} | |
| thrown in %sbug70284.php on line 6 | |