The provided vulnerability information and references do not explicitly name specific vulnerable functions. While the CWE-77 classification suggests command injection issues, the advisory describes a path manipulation/creation vulnerability leading to potential RCE through directory naming rather than direct command injection. The actual vulnerable code path would likely involve directory creation/file handling functions, but without access to the specific commit diffs or patch details, we cannot definitively identify the exact functions responsible. The Windows-specific file system behavior mentioned suggests potential case sensitivity exploitation, but this would depend on Drupal's file handling implementation details not revealed in provided sources.