Details
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Software: Quiz And Survey Master (Formerly Quiz Master Next)
Version: 4.5.4,4.7.8
Homepage: https://wordpress.org/plugins/quiz-master-next/
Advisory report: https://security.dxw.com/advisories/csrfstored-xss-in-quiz-and-survey-master-formerly-quiz-master-next-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 Quiz And Survey Master (Formerly Quiz Master Next) allows unauthenticated attackers to do almost anything an admin can

Vulnerability
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A CSRFA vulnerabilityA allows an unauthenticated attacker to add questions to existing quizzes.
The question_name parameter is put into a manually-constructed JavaScript objectA and escaped with esc_js() (php/qmn_options_questions_tab.php line 499). If the user (or attacker) creates a new question on a quizA containingA a<script>alert(1)</script>a in the question_name field then aquestion: a&lt;script&gt;alert(1)&lt;/script&gt;a,a will get outputA inside the JS object. All good so far.
However, inA js/admin_question.js on line 205, we see this line, as part of some JS-generated HTML:
jQuery(\'<textarea/>\').html(questions_list[i].question.replace(/\"/g, \'\"\').replace(/\'/g, \"\'\")).text()+
This looks okay. Weare creating a TEXTAREA element, setting its HTML to the value of the question_name parameter, and extracting the .text() of it. If we did jQuery(a<textarea/>a).html(a<script>alert(1)</script>a).text() we would get aalert(1)a as the output.
However, thatas not how inline JavaScript gets parsed. Between a <script> and a </script>, the HTML parser actually parses a&lt;a as a&lt;a not as a<a. So if we doA jQuery(a<textarea/>a).html(a&lt;script&gt;alert(1)&lt;/script&gt;a).text() we get a<script>alert(1)</script>a.
And since a<script>alert(1)</script>a doesnat appear anywhere in the page, Chromeas reflected XSS mitigation measures are not activated. ThusA the stored XSS attack can be executed immediately.

Proof of concept
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Click the submit button on the following page (in a real attack the form can be submitted without user interaction):
<form method=\"POST\" action=\"http://localhost/wp-admin/admin.php?page=mlw_quiz_options&quiz_id=1\">
<input type=\"text\" name=\"question_type\" value=\"0\">
<input type=\"text\" name=\"question_name\" value=\"&lt;script>alert(1)&lt;/script>\">
<input type=\"text\" name=\"question_submission\" value=\"new_question\">
<input type=\"text\" name=\"quiz_id\" value=\"1\">
<input type=\"submit\">
</form>

Mitigations
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Upgrade to version 4.7.9 or later.

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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2015-09-14: Discovered
2016-12-07: Reported to vendor viaA https://quizandsurveymaster.com/contact-us/
2016-12-07: Requested CVE
2016-12-13: Vendor replied
2016-12-14: Vendor reportedA issue fixed in version 4.7.9
2016-12-15: Advisory published



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