If your curl implementation does not need to read local files, disable it using the CURLPROTO_HTTP and CURLPROTO_HTTPS constraints.
A quick way to verify a file's existence and content type on a server via command line. Security Considerations curl-url-file-3A-2F-2F-2F
: Indicates that the input string is parsed as a Uniform Resource Locator. If your curl implementation does not need to
Example attack payload: curl "file:///etc/passwd" encoded as curl-url-file-3A-2F-2F-2Fetc-2Fpasswd curl-url-file-3A-2F-2F-2F
When broken down into its basic components, the string reveals a classic Uniform Resource Identifier (URI) mechanism designed for local system execution:
If you need a to include in your content: