PHP SSRF

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SSRF PHP funkcije

Neke funkcije kao što su file_get_contents(), fopen(), file(), md5_file() prihvataju URL-ove kao ulaz koji će pratiti, što čini moguće SSRF ranjivosti ako korisnik može kontrolisati podatke:

file_get_contents("http://127.0.0.1:8081");
fopen("http://127.0.0.1:8081", "r");
file("http://127.0.0.1:8081");
md5_file("http://127.0.0.1:8081");

Wordpress SSRF putem DNS Rebinding

Kao objašnjeno u ovom blog postu, čak je i Wordpress funkcija wp_safe_remote_get ranjiva na DNS rebinding, što je čini potencijalno ranjivom na SSRF napade. Glavna validacija koju poziva je wp_http_validate_url, koja proverava da li je protokol http:// ili https:// i da li je port jedan od 80, 443, i 8080, ali je ranjiva na DNS rebinding.

Ostale ranjive funkcije prema postu su:

wp_safe_remote_request()
wp_safe_remote_post()
wp_safe_remote_head()
WP_REST_URL_Details_Controller::get_remote_url()
download_url()
wp_remote_fopen()
WP_oEmbed::discover()

CRLF

Štaviše, u nekim slučajevima može biti čak moguće poslati proizvoljne zaglavlja putem CRLF "ranjivosti" u prethodnim funkcijama:

# The following will create a header called from with value Hi and
# an extra header "Injected: I HAVE IT"
ini_set("from", "Hi\r\nInjected: I HAVE IT");
file_get_contents("http://127.0.0.1:8081");

GET / HTTP/1.1
From: Hi
Injected: I HAVE IT
Host: 127.0.0.1:8081
Connection: close

# Any of the previously mentioned functions will send those headers

Za više informacija o toj CRLF ranjivosti, proverite ovaj bug https://bugs.php.net/bug.php?id=81680&edit=1

Napomena da ove funkcije mogu imati druge metode za postavljanje proizvoljnih zaglavlja u zahtevima, kao što su:

$url = "";

$options = array(
'http'=>array(
'method'=>"GET",
'header'=>"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n" .  // check function.stream-context-create on php.net
"User-Agent: Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.102011-10-16 20:23:10\r\n" // i.e. An iPad
)
);

$context = stream_context_create($options);
$file = file_get_contents($url, false, $context);

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# The following will create a header called from with value Hi and # an extra header "Injected: I HAVE IT" ini_set("from", "Hi\r\nInjected: I HAVE IT"); file_get_contents("http://127.0.0.1:8081"); GET / HTTP/1.1 From: Hi Injected: I HAVE IT Host: 127.0.0.1:8081 Connection: close # Any of the previously mentioned functions will send those headers

$url = ""; $options = array( 'http'=>array( 'method'=>"GET", 'header'=>"Accept-language: en\r\n" . "Cookie: foo=bar\r\n" . // check function.stream-context-create on php.net "User-Agent: Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.102011-10-16 20:23:10\r\n" // i.e. An iPad ) ); $context = stream_context_create($options); $file = file_get_contents($url, false, $context);