curl: Gopher Protocol Command Injection (SSRF Smuggling)

Summary The curl Gopher protocol handler is vulnerable to command injection through URL-encoded CRLF sequences in the path. This allows an attacker to "smuggle" additional Gopher selectors or arbitrary commands into a single Gopher request. By using %0d%0a in the URL, an attacker can break the...

curl: CRLF Injection in Gopher Protocol (`lib/gopher.c`)

Control characters slip through during URL handling in curl’s Gopher setup. Though null bytes get blocked by the REJECTZERO setting, returns and line feeds remain permitted. A specially built address using percent-encoded breaks - like %0D%0A - opens room for command insertion. Because of how...