, a ubiquitous command-line tool used to transfer data with URLs. : Indicates the use of the
Decoding cURL SSRF Payloads: The Case of file-3A-2F-2F-2F Content: curl-url-file-3A-2F-2F-2F
. When this URL is encoded—often necessary when passing it through web forms or scripts—the colon ( and the forward slashes ( transforms into file%3A%2F%2F%2F file-3A-2F-2F-2F in some simplified naming conventions). 2. Practical Applications for Developers , a ubiquitous command-line tool used to transfer
file\%3A%2F%2F%2F (three consecutive encoded slashes)-3A-2F-2F-2F (the literal string, common in rewritten logs)The most useful "feature" is treating a local file exactly like a web resource. This is great for scripts that need to be flexible: The most useful "feature" is treating a local
In the world of command-line tools, few utilities have gained as much popularity and versatility as curl . One of the most commonly used commands in the arsenal of developers, system administrators, and power users alike, curl allows for the easy transfer of data to and from a web server using various protocols such as HTTP, HTTPS, SCP, SFTP, TFTP, and more. A particularly useful aspect of curl is its ability to work with URLs that contain specific file paths, such as curl-url-file-3A-2F-2F-2F , enabling users to directly access and manipulate files on remote servers.