Details
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Software: Theme My Login
Version: 6.3.9
Homepage: http://wordpress.org/plugins/theme-my-login/
Advisory report: https://security.dxw.com/advisories/lfi-in-theme-my-login/
CVE: Awaiting assignment
CVSS: 6.5 (Medium; AV:N/AC:L/Au:S/C:P/I:P/A:P)

Description
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Local File Inclusion in Theme My Login 6.3.9 provides access to arbitrary files and could facilitate arbitrary code execution

Vulnerability
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Users able to edit posts are able to use a shortcode which is vulnerable to local file inclusion. This can allow an attacker read-only access to any non-PHP file, or the ability to execute arbitrary code if they can upload a PHP file.

Proof of concept
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Depending on the exact path to your WordPress installation, the following may or may not cause the contents of /etc/passwd to be displayed (adjust as necessary):
[theme-my-login login_template=\"../../../../../../../../../etc/passwd\"]

Mitigations
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Upgrade to version 6.3.10 or later.
Please note that while the changelog for version 6.3.10 labels this as a potential vulnerability, this plugin is in fact categorically vulnerable as described above. Users of this plugin should not consider version 6.3.10 to be an optional or low-priority upgrade.

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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2014-06-10: Discovered
2014-06-25: Reported to WP.org; contact information requested from author
2014-06-26: Reported to author
2014-06-27: Author reports fixed
2014–6-30: Published



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