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CVE-2020-13664 is an arbitrary PHP code execution vulnerability in Drupal Core under certain circumstances. An attacker can trick an authenticated administrator into visiting a malicious site, which can result in creation of a carefully named directory on the server’s filesystem. With that directory in place, the attacker can then attempt to brute-force a path to achieve code execution, potentially escalating to remote code execution. Windows-based Drupal deployments are described as most likely to be affected. Affected versions include Drupal Core 8.8.x prior to 8.8.8, 8.9.x prior to 8.9.1, and 9.0.x prior to 9.0.1.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This six-file repository is an operational Python proof of concept for CVE-2020-13664, targeting Drupal Core's simpletest User-Agent validation. poc.py is the main entry point and implements CSRF generation, response/header-based creation-time guessing, HMAC User-Agent brute forcing and regeneration, malicious Drupal installation against an attacker database, and a watchdog-table deserialization chain. The chain uses a serialized GuzzleHttp Cookie FileCookieJar object to write a PHP shell, then triggers it through Drupal's database-log report route. serializer.php is a local helper for producing/verifying the PHP serialized gadget. requirements.txt supplies BeautifulSoup and MySQL Connector/Python. docker-compose.yml provides a local Drupal 8.8.7 and MySQL 5.7 test environment, while README.md documents the CSRF, brute-force, takeover, and shell stages. The default configuration contains an attacker database IP, MySQL port 3306, and hard-coded database/site/admin credentials; these are intended to be edited by the operator.
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