feat: app system challenges

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@dextradata.com>

app-system/elf-x86-stack-buffer-overflow-basic-1/helper_recon.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+import paramiko
+
+HOST = "challenge02.root-me.org"
+PORT = 2222
+USER = "app-systeme-ch13"
+PASSWORD = "app-systeme-ch13"
+
+
+def run() -> None:
+    client = paramiko.SSHClient()
+    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+    client.connect(
+        hostname=HOST, port=PORT, username=USER, password=PASSWORD, timeout=15
+    )
+    try:
+        commands = [
+            "pwd",
+            "ls -la",
+            "file ch13",
+            "checksec --file=ch13 || true",
+            "./ch13 <<<'AAAA'",
+        ]
+        for cmd in commands:
+            stdin, stdout, stderr = client.exec_command(cmd)
+            out = stdout.read().decode("utf-8", errors="replace")
+            err = stderr.read().decode("utf-8", errors="replace")
+            print(f"--- $ {cmd} ---")
+            if out:
+                print(out, end="" if out.endswith("\n") else "\n")
+            if err:
+                print("[stderr]")
+                print(err, end="" if err.endswith("\n") else "\n")
+    finally:
+        client.close()
+
+
+if __name__ == "__main__":
+    run()