Details
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Software: Subscribe to Comments
Version: 2.1.2
Homepage: http://wordpress.org/plugins/subscribe-to-comments/
Advisory report: https://security.dxw.com/advisories/admin-only-local-file-inclusion-and-arbitrary-code-execution-in-subscribe-to-comments-2-1-2/
CVE: Awaiting assignment
CVSS: 8 (High; AV:N/AC:L/Au:S/C:C/I:P/A:P)

Description
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Admin-only local file inclusion and arbitrary code execution in Subscribe to Comments 2.1.2

Vulnerability
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Administrators can perform Local File include attacks, which is a privilege escalation on systems where the administrator doesn’t have control over the server.
If administrators can upload PHP files (or any file which can contain “<?php …”), they can also perform arbitrary code execution by the same method.

Proof of concept
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http://localhost/wp-admin/options-general.php?page=stc-options
Set “Path to header” to “/etc/passwd”
Check “Use custom style for Subscription Manager”
“Update Options”
https://localhost/?wp-subscription-manager=1


Mitigations
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Upgrade to version 2.3 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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2013-08-07: Discovered
2015-07-13: Reported to vendor by email
2015-07-13: Requested CVE
2015-07-14: Vendor responded confirming fixed in version 2.3
2015-07-14: Published


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