WordPress WP Image Zoom 1.23 Denial Of Service

WordPress WP Image Zoom plugin version 1.23 suffers from a denial of service vulnerability.

MD5 | 463d616287fd5a1b077c96424563a0b3

Software: WP Image Zoom
Version: 1.23
Homepage: http://wordpress.org/plugins/wp-image-zoooom/
Advisory report: https://advisories.dxw.com/advisories/wp-image-zoom-dos/
CVE: Awaiting assignment
CVSS: 7.5 (High; AV:N/AC:L/Au:S/C:N/I:P/A:C)

WP Image Zoom allows anybody to cause denial of service

WP Image Zoom includes an AJAX action which allows any logged in user to set any option to a1a. This means that any logged in user can cause a denial of service for all WP URLs by setting the atemplatea option to a1a.
Additionally, this vulnerability can be triggered via CSRF meaning that anybody who can convince a logged in user to follow a link can also cause a denial of service.

Proof of concept
Press the submit button in the following HTML snippet:
<form action=\"http://localhost/wp-admin/admin-ajax.php\" method=\"POST\">
<input type=\"text\" name=\"action\" value=\"iz_dismiss\">
<input type=\"text\" name=\"option\" value=\"template\">
<input type=\"submit\">
This will set the template option to 1 causing fatal errors for any WordPress URL.
In a real attack the form could be set to autosubmit so no user interaction is required except for following a link.

Upgrade to version 1.24 or later.

Disclosure policy
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.


2018-03-20: Discovered
2018-03-27: Reported to author via https://www.silkypress.com/contact/
2018-03-27: Vendor responded
2018-03-29: Vendor reported issue fixed in version 1.24

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

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