Typo3 Restler 1.7.0 Local File Disclosure
Description
Restler is a PHP framework for building RESTful APIs that supports multiple response formats. The Typo3 Restler extension version 1.7.0 and earlier contains a path traversal vulnerability (CWE-22) that allows unauthenticated remote attackers to read arbitrary files from the server's filesystem. This occurs due to insufficient input validation when processing file path parameters, enabling attackers to use directory traversal sequences (e.g., '../') to access files outside the intended directory.
Remediation
Take the following steps to remediate this vulnerability:<br/><br/>1. <strong>Immediate Action:</strong> Upgrade the Typo3 Restler extension to version 1.7.1 or later, which addresses this vulnerability<br/><br/>2. <strong>Verification:</strong> After upgrading, test that file access is properly restricted by attempting to access files using path traversal sequences<br/><br/>3. <strong>Additional Hardening:</strong> Implement the following security measures:<br/> • Configure web server permissions to restrict PHP process access to only necessary directories<br/> • Enable open_basedir restrictions in PHP configuration to limit filesystem access<br/> • Implement input validation to reject requests containing directory traversal patterns (../, .\, etc.)<br/> • Review application logs for any suspicious file access attempts that may indicate prior exploitation<br/><br/>4. <strong>Long-term:</strong> Establish a regular patching schedule for all Typo3 extensions and monitor security advisories