PHP SSRF
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SSRF PHP函数
一些函数,如file_get_contents(),fopen(),file(),md5_file()接受URL作为输入,如果用户可以控制数据,则可能导致SSRF漏洞:
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");
CRLF
此外,在某些情况下,甚至可以通过先前函数中的 CRLF “漏洞” 发送任意标头:
# 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
有关CRLF漏洞的更多信息,请查看此漏洞https://bugs.php.net/bug.php?id=81680&edit=1
请注意,这些函数可能有其他方法来在请求中设置任意标头,例如:
$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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