PTNews Site

PTNews v1.7.7 - Access to administrator functions without authentification .oO Overview Oo. PTNews v1.7.7 - Access to administrator functions without authentification Discovered on 2003, April, 7th Vendor: PTNews - http://www.openbg.net/ptsite/ PT News is a simple news system. This is lite solution for sites without SQL database support. Whole system is written in PHP (PHP3 and PHP4 support). A vulnerability allows to access to the administrator functions, without authentification. .oO Details Oo. In PTNews v1.7.7, administrator functions are located in the file news.inc Here is the interesting piece of code : //handle administrator functions $files = getFileNames($newsdir); $context = ""; if ($HTTP_POST_VARS[submitButton] == $lang[frm_btn]) { createNewsEntry($newsdir); if ("replace" == $HTTP_POST_VARS[action] && in_array($HTTP_POST_VARS[file], $files)) { deleteNewsEntry($newsdir.$HTTP_POST_VARS[file]); } makeNewsRSS($newsdir); } elseif (isset($HTTP_GET_VARS[delete])) { if ("all" == $HTTP_GET_VARS[delete]) { $context = deleteAll($newsdir,$config[newssuff]); } else { if (in_array($HTTP_GET_VARS[delete], $files)) deleteNewsEntry ($newsdir.$HTTP_GET_VARS[delete]); } makeNewsRSS($newsdir); } elseif (isset($HTTP_GET_VARS[edit]) && in_array($HTTP_GET_VARS[edit], $files)) { $context = editNewsEntry($newsdir,$HTTP_GET_VARS[edit]); } As you can see, it can handle : - News creation - News replacement - News deletion - News editing Now, the file "news.inc" is included in the index.php file as followed : PTNews Site etc... Bingo ! File "news.inc" is needed for the public access file "index.php", for example for the "searchNews" or "displayNews" functions. But as far as news.inc includes administrators functions, everybody can access the administrator function... .oO Exploit Oo. Ok, that's really easy. You just have to send a specific URL to access the admin functions. Function / URL : Create a news / Not an URL : only posted datas. Not impossible to exploit :) Replace a news / Not an URL : only posted datas. Not impossible to exploit :) Delete all news / http://www.victim.com/ptnews/ index.php?delete=all Edit a news / Too difficult to exploit .oO Solution Oo. The solution is to separate the standard news functions and the administrator news fonctions. Standard news functions must go to news.inc Administrator news fonctions must go to admin.inc The vendor has been informed and solved the problem. Download ptnews 1.7.8 at: http://www.openbg.net/ptsite/ .oO Discovered by Oo. Arnaud Jacques aka scrap webmaster@securiteinfo.com http://www.securiteinfo.com