Code Snippets <= 3.9.1 - Authenticated (Contributor+) PHP Code Injection via extract() and PHP Filter Chains
Vulnerability Description
The Code Snippets plugin for WordPress is vulnerable to PHP Code Injection in all versions up to, and including, 3.9.1. This is due to the plugin's use of extract() on attacker-controlled shortcode attributes within the `evaluate_shortcode_from_flat_file` method, which can be used to overwrite the `$filepath` variable and subsequently passed to require_once. This makes it possible for authenticated attackers, with Contributor-level access and above, to execute arbitrary PHP code on the server via the `[code_snippet]` shortcode using PHP filter chains granted they can trick an administrator into enabling the "Enable file-based execution" setting and creating at least one active Content snippet.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Michael Mazzolini
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/c7c7247c-2fc3-46ff-858e-2242b7211476?source=cve
- https://plugins.trac.wordpress.org/browser/code-snippets/tags/3.8.1/php/front-end/class-front-end.php#L295
- https://plugins.trac.wordpress.org/browser/code-snippets/tags/3.8.1/php/front-end/class-front-end.php#L296
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3397635%40code-snippets%2Ftrunk&old=3395415%40code-snippets%2Ftrunk&sfp_email=&sfph_mail=#file23
Affected Vendor
codesnippetspro
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