Details
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Software: Login Widget With Shortcode
Version: 3.1.1
Homepage: http://wordpress.org/plugins/login-sidebar-widget/
Advisory report: https://security.dxw.com/advisories/csrfxss-vulnerablity-in-login-widget-with-shortcode-allows-unauthenticated-attackers-to-do-anything-an-admin-can-do/
CVE: Awaiting assignment
CVSS: 6.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:P)

Description
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CSRF/XSS vulnerablity in Login Widget With Shortcode allows unauthenticated attackers to do anything an admin can do

Vulnerability
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This plugin is vulnerable to a combination CSRF/XSS attack. An attacker able to convince an admin to visit a link of their choosing is able to insert arbitrary HTML into an admin page.  Using that ability they can use JavaScript to control an admin user’s browser, allowing the attacker to create user accounts, create posts, delete all posts, etc.

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 in the admin screens. (In a real attack the form can be made to auto-submit using Javascript).
<form method=\"POST\" action=\"http://localhost/wp-admin/options-general.php?page=login_widget_afo\">
  <input type=\"text\" name=\"custom_style_afo\" value=\"</textarea><script>alert(1)</script>\">
  <input type=\"text\" name=\"option\" value=\"login_widget_afo_save_settings\">
  <input type=\"submit\">
</form>

Mitigations
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Upgrade to version 3.2.1 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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2014-08-26: Discovered
2014-09-15: Reported to vendor by email
2014-09-15: Vendor reported the issue fixed and a new version released
2014-09-17: Published



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