Fix

intercepting-communication/.init

@@ -1,2 +1,3 @@
 chmod 6755 /challenge/run
+touch /run/xtables.lock
 rm /challenge/.init

intercepting-communication/level-11/run

@@ -1,15 +1,12 @@
 #!/usr/bin/exec-suid --real -- /usr/bin/python -I
 
-import os
 import random
 import subprocess
 import scapy.all as scapy
 from dojjail import Host, Network
 
 flag = open("/flag").read()
 
-os.open("/run/xtables.lock", os.O_CREAT)
-
 def drop_rst_packets(sport):
     subprocess.run(["/usr/sbin/iptables",
                     "-A", "OUTPUT",

intercepting-communication/level-14/run

@@ -50,7 +50,7 @@ class AuthenticatedServerHost(Host):
                 time.sleep(1)
                 connection.sendall(b"secret: ")
                 secret = bytes.fromhex(connection.recv(1024).decode())
-                if secret != self.secret:
+                if secret != bytes(self.secret):
                     connection.close()
                     continue