Details
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Software: Watu PRO Play
Version: 1.9.2.1
Homepage: http://calendarscripts.info/watupro/modules.html#play
Advisory report: https://security.dxw.com/advisories/stored-xss-in-watu-pro-play-allows-unauthenticated-attacker-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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Stored XSS in Watu PRO Play allows unauthenticated attackers to do almost anything an admin can

Vulnerability
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An attacker able to convince an admin to visit a link of their choosing (e.g. via a phishing attack) is able to execute arbitrary JavaScript. This makes use of a CSRF vulnerability (no nonce protection on the levels form)

Proof of concept
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If a logged-in administrator user clicks the submit button on this form, a JavaScript alert will display on /wp-admin/admin.php?page=watuproplay_levels (in a real attack the form can be made to auto-submit using JavaScript):
<form action=\"http://localhost/wp-admin/admin.php?page=watuproplay_levels&action=add\" method=\"POST\">
  <input type=\"text\" name=\"name\" value=\"<script>alert(1)</script>\">
  <input type=\"text\" name=\"ok\" value=\"1\">
  <input type=\"submit\">
</form>

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 security@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.org) 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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2015-08-11: Discovered
2015-08-26: Reported to vendor by email
2015-08-26: Requested CVE



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