MySql and FastCGI null byte error payload error

[GeniusGeeek]

A php website vunerable to SSRF using the curl_setopt() function to load files will throw this error due to the null byte in the generated url when using the payload url generated by exploit MySql and exploit FastCGI

PHP Fatal error: Uncaught ValueError: curl_setopt(): cURL option must not contain any null bytes
making the attack void

[dang178]

you should second urlencode strings

[GeniusGeeek]

alright, issue resolved. The fastCGI, it is unclear how the session of RCE is to be gotten, example ls given as command how will the result of ls be gotten?