Curl-url-file-3a-2f-2f-2f ((free)) Instant

Decoding cURL SSRF Payloads: The Case of file-3A-2F-2F-2F Content:

Are you trying to or find a way to download a file from a web address? Tutorial - curl

That could be a placeholder for in a cURL context.

If a web application allows a user to input a URL, and that application passes the input to curl , an attacker could use file-3A-2F-2F-2F (or file:/// ) to read sensitive files from the server, such as: /etc/passwd (User accounts) ~/.ssh/id_rsa (Private SSH keys) /proc/self/environ (Environment variables) curl-url-file-3A-2F-2F-2F

Windows supports (Universal Naming Convention), which allow access to network shares using the syntax \\server\share\path . cURL on Windows will accept UNC paths via the file:// protocol, effectively turning local file access into SSRF attacks (Server-Side Request Forgery):

file:///C:/Users/Admin/Documents/config.txt (The third slash precedes the local drive letter assignment). Utilizing cURL with Local Files

# Windows Command Prompt / PowerShell syntax curl.exe file:///C:/Users/Public/Documents/notes.txt Use code with caution. Decoding cURL SSRF Payloads: The Case of file-3A-2F-2F-2F

: Percent-encoded representations of standard characters: 3A corresponds to the hexadecimal value for a colon ( : ).

However, if the file path contains special characters, we can use the curl-url-file-3A-2F-2F-2F syntax:

If a web application allows a user to input a URL and the server fetches it using curl , an attacker might try: file:///etc/passwd cURL on Windows will accept UNC paths via

To truly understand the keyword, you must experiment (ethically, on your own system).

Why does curl allow use of the file URL scheme, but not wget

: Using local paths helps developers map out how curl normalizes paths and slashes across different operating systems. How curl Processes file:/// Across Operating Systems