Server registration vulnerability

For reference, here are the scripts:

Patch:

diff --git a/src/engine/server/register.cpp b/src/engine/server/register.cpp
index 0b7eb94..b287068 100644
--- a/src/engine/server/register.cpp
+++ b/src/engine/server/register.cpp
@@ -275,7 +275,7 @@ int CRegister::RegisterProcessPacket(CNetChunk *pPacket)
                char aBuf[256];
                str_format(aBuf, sizeof(aBuf), "ERROR: configure your firewall/nat to let through udp on port %d.", g_Config.m_SvPort);
                m_pConsole->Print(IConsole::OUTPUT_LEVEL_STANDARD, "register", aBuf);
-               RegisterNewState(REGISTERSTATE_ERROR);
+               //RegisterNewState(REGISTERSTATE_ERROR);
                return 1;
        }
        else if(pPacket->m_DataSize == sizeof(SERVERBROWSE_COUNT)+2 &&

Binary patcher:

import argparse
import os

SERVERBROWSE_FWERROR = b'\xff\xff\xff\xfffwer'

def make_executable(path):
    """
    Taken from http://stackoverflow.com/a/30463972.

    Has obvious race conditions, but whatever...
    """
    old_mode = os.stat(path).st_mode

    new_mode = old_mode | ((old_mode & 0o444) >> 2)    # copy R bits to X

    if new_mode != old_mode:
        os.chmod(path, new_mode)


def main():
    parser = argparse.ArgumentParser(description="Patch a Teeworlds server executable to work around a bug in the registering code.")
    parser.add_argument('file', metavar="FILE", help="Filename of the executable to patch")

    filename = parser.parse_args().file
    file = open(filename, 'rb')

    contents = file.read()
    fixed = contents.replace(SERVERBROWSE_FWERROR, os.urandom(len(SERVERBROWSE_FWERROR)))

    fixed_filename = filename + "_fixed.exe"
    open(fixed_filename, 'wb').write(fixed)
    make_executable(fixed_filename)


if __name__ == '__main__':
    main()