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ProxyFuzz is a man-in-the-middle non-deterministic network fuzzer written in
Python. ProxyFuzz randomly changes (fuzzes) contents on the network traffic.
It supports TCP and UDP protocols and can also be configured to fuzz only one
side of the communication. ProxyFuzz is protocol agnostic so it can randomly
fuzz any network communication.
ProxyFuzz is a good tool for quickly testing network protocols and provide with
basic proof of concepts. Using this tool you will be amazed by the poor quality
of software and you will see clients and servers dying upon unexpected input,
just be prepared to see the very weird behaviours.
Syntax of ProxyFuzz:
ProxyFuzz 0.1, Simple fuzzing proxy by Rodrigo Marcos
usage():
python3 proxyfuzz -l -r -p [options]
[options]
-w: Number of requests to send before start fuzzing
-c: Fuzz only client side (both otherwise)
-s: Fuzz only server side (both otherwise)
-u: UDP protocol (otherwise TCP is used)
-v: Verbose (outputs network traffic)
-h: Help page

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#!/usr/bin/python3
# Proxyfuzz - On the fly TCP and UDP network fuzzer
# Copyright (C) 2011 Rodrigo Marcos
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Proxyfuzz: a TCP and UDP proxy man-in-the-middle fuzzer
# v 0.1
# By Rodrigo Marcos
# http://www.secforce.co.uk
from twisted.protocols import portforward
from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
import getopt, sys
from random import randint, randrange
# UDP Proxy stuff
class Client(DatagramProtocol):
def __init__(self, server, host, port):
self.server = server
self.host = host
self.port = port
def startProtocol(self):
self.transport.connect(desthost, destport)
def datagramReceived(self, data, host_port):
global verbose
global notuntil
global request
global testclient
if testclient:
if request < notuntil:
request = request + 1
else:
data = fuzz(data)
if verbose:
print("Server ------> Client")
print(data)
addr=(self.host, self.port)
self.server.transport.write(data, addr)
class Server(DatagramProtocol):
client = None
def datagramReceived(self, data, host_port):
host, port = host_port
if not self.client or self.client.host != host or self.client.port != port:
self.client = Client(self, host, port)
reactor.listenUDP(0, self.client)
global verbose
global notuntil
global request
global testserver
if testserver:
if request < notuntil:
request = request + 1
else:
data = fuzz(data)
if verbose:
print("Client ------> Server")
print(data)
addr=(desthost, destport)
self.client.transport.write(data, addr)
# TCP proxy stuff
def server_dataReceived(self, data):
global verbose
global notuntil
global request
global testserver
if testserver:
if request < notuntil:
request = request + 1
else:
data = fuzz(data)
if verbose:
print("Client ------> server")
print(data)
portforward.Proxy.dataReceived(self, data)
portforward.ProxyServer.dataReceived = server_dataReceived
def client_dataReceived(self, data):
global verbose
global notuntil
global request
global testclient
if testclient:
if request < notuntil:
request = request + 1
else:
data = fuzz(data)
if verbose:
print("Server ------> Client")
print(data)
portforward.Proxy.dataReceived(self, data)
portforward.ProxyClient.dataReceived = client_dataReceived
overflowstrings = ["A" * 255, "A" * 256, "A" * 257, "A" * 420, "A" * 511, "A" * 512, "A" * 1023, "A" * 1024, "A" * 2047,
"A" * 2048, "A" * 4096, "A" * 4097, "A" * 5000, "A" * 10000, "A" * 20000, "A" * 32762, "A" * 32763,
"A" * 32764, "A" * 32765, "A" * 32766, "A" * 32767, "A" * 32768, "A" * 65534, "A" * 65535,
"A" * 65536, "%x" * 1024, "%n" * 1025, "%s" * 2048, "%s%n%x%d" * 5000, "%s" * 30000, "%s" * 40000,
"%.1024d", "%.2048d", "%.4096d", "%.8200d", "%99999999999s", "%99999999999d", "%99999999999x",
"%99999999999n", "%99999999999s" * 1000, "%99999999999d" * 1000, "%99999999999x" * 1000,
"%99999999999n" * 1000, "%08x" * 100, "%%20s" * 1000, "%%20x" * 1000, "%%20n" * 1000, "%%20d" * 1000,
"%#0123456x%08x%x%s%p%n%d%o%u%c%h%l%q%j%z%Z%t%i%e%g%f%a%C%S%08x%%#0123456x%%x%%s%%p%%n%%d%%o%%u%%c%%h%%l%%q%%j%%z%%Z%%t%%i%%e%%g%%f%%a%%C%%S%%08x"]
def bitflipping(data):
l = len(data)
n = int(l * 7 / 100) # 7% of the bytes to be modified
for i in range(0, n): # We change the bytes
r = randint(0, l - 1)
data = data[0:r] + str.encode(chr(randrange(0, 255))) + data[r + 1:]
return data
def bofinjection(data):
l = len(data)
r = randint(0, len(overflowstrings) - 1)
data = data[0:r] + str.encode(overflowstrings[r]) + data[r - l:]
return data
def fuzz(data):
r = randint(0, 5)
if r == 0:
data = bitflipping(data)
r = randint(0, 5)
if r == 0:
data = bofinjection(data)
return data
def startudpproxy():
reactor.listenUDP(localport, Server())
reactor.run()
def starttcpproxy():
reactor.listenTCP(localport, portforward.ProxyFactory(desthost, destport))
reactor.run()
def usage():
# print "###############################################################"
print('')
print("ProxyFuzz 0.1, Simple fuzzing proxy by Rodrigo Marcos")
print("http://www.secforce.co.uk")
print('')
print("usage():")
print('')
print("proxyfuzz -l <localport> -r <remotehost> -p <remoteport> [options]")
print('')
print(" [options]")
print(" -c: Fuzz only client side (both otherwise)")
print(" -s: Fuzz only server side (both otherwise)")
print(" -w: Number of requests to send before start fuzzing")
print(" -u: UDP protocol (otherwise TCP is used)")
print(" -v: Verbose (outputs network traffic)")
print(" -h: Help page")
verbose = False
notuntil = 0
request = 0
proto = "tcp"
localport = 0
desthost = ""
destport = 0
testclient = 1
testserver = 1
def main():
global verbose
global notuntil
global proto
global localport
global desthost
global destport
global testclient
global testserver
try:
opts, args = getopt.getopt(sys.argv[1:], "uvhcsl:r:p:w:", ["help"])
except getopt.GetoptError:
usage()
sys.exit(2)
try:
for o, a in opts:
if o in ("-h", "--help"):
usage()
sys.exit()
if o == "-l":
localport = int(a)
if o == "-r":
desthost = a
if o == "-p":
destport = int(a)
if o == "-v":
verbose = True
if o == "-w":
notuntil = int(a)
if o == "-u":
proto = "udp"
if o == "-c": # Only client
testserver = 0
if o == "-s": # Only server
testclient = 0
except:
usage()
sys.exit(2)
if testserver == 0 and testclient == 0:
usage()
sys.exit(2)
elif localport == 0 or desthost == "" or destport == 0:
usage()
sys.exit(2)
else:
if proto == "tcp":
starttcpproxy()
else: # UDP
startudpproxy()
if __name__ == "__main__":
main()

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Name: proxyfuzz
Version: 20190404
Release: 31%{?dist}
Summary: Man-in-the-middle non-deterministic network fuzzer
# Automatically converted from old format: GPLv3+ - review is highly recommended.
License: GPL-3.0-or-later
URL: https://github.com/SECFORCE
Source0: proxyfuzz.py
Source1: README-Fedora
BuildArch: noarch
Requires: python3-twisted
BuildRequires: python3-devel
%if 0%{?with_python3}
BuildRequires: python3-devel
%endif # if with_python3
#Patch0: make-executable.patch
%description
ProxyFuzz is a man-in-the-middle non-deterministic network fuzzier written in
Python. ProxyFuzz randomly changes (fuzzes) contents on the network traffic.
It supports TCP and UDP protocols and can also be configured to fuzz only one
side of the communication. ProxyFuzz is protocol agnostic so it can randomly
fuzz any network communication.
%prep
cp -p %{SOURCE0} .
cp -p %{SOURCE1} .
#%patch0 -p1 -b .make-executable
%build
%install
rm -rf $RPM_BUILD_ROOT
install -m 755 -p -d ${RPM_BUILD_ROOT}/%{_sbindir}
install -m 755 -p proxyfuzz.py ${RPM_BUILD_ROOT}/%{_sbindir}/proxyfuzz
%files
%doc README-Fedora
%{_sbindir}/proxyfuzz
%changelog
* Thu Jul 16 2026 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-31
- Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild
* Sat Jan 17 2026 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-30
- Rebuilt for https://fedoraproject.org/wiki/Fedora_44_Mass_Rebuild
* Fri Jul 25 2025 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-29
- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
* Sat Jan 18 2025 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-28
- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
* Thu Jul 25 2024 Miroslav Suchý <msuchy@redhat.com> - 20190404-27
- convert license to SPDX
* Fri Jul 19 2024 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-26
- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
* Fri Jan 26 2024 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-25
- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
* Sun Jan 21 2024 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-24
- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
* Fri Jul 21 2023 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-23
- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
* Fri Jan 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-22
- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
* Fri Jul 22 2022 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-21
- Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild
* Fri Jan 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-20
- Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild
* Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-19
- Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
* Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org>
- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
* Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-17
- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
* Thu Jan 30 2020 Fedora Release Engineering <releng@fedoraproject.org> - 20190404-16
- Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
* Sat Feb 02 2019 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-13
- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild
* Fri Jul 13 2018 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-12
- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
* Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-11
- Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
* Wed Feb 07 2018 Iryna Shcherbina <ishcherb@redhat.com> - 20110923-10
- Update Python 2 dependency declarations to new packaging standards
(See https://fedoraproject.org/wiki/FinalizingFedoraSwitchtoPython3)
* Thu Jul 27 2017 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-9
- Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild
* Sat Feb 11 2017 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-8
- Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
* Thu Feb 04 2016 Fedora Release Engineering <releng@fedoraproject.org> - 20110923-7
- Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild
* Thu Jun 18 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 20110923-6
- Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild
* Sat Jun 07 2014 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 20110923-5
- Rebuilt for https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
* Sun Aug 04 2013 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 20110923-4
- Rebuilt for https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
* Thu Feb 14 2013 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 20110923-3
- Rebuilt for https://fedoraproject.org/wiki/Fedora_19_Mass_Rebuild
* Sat Jul 21 2012 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 20110923-2
- Rebuilt for https://fedoraproject.org/wiki/Fedora_18_Mass_Rebuild
* Mon Jan 2 2012 Petr Sklenar <psklenar at, redhat.com> 20110923-1
- version changed
- released changed
* Thu Oct 13 2011 Petr Sklenar <psklenar at, redhat.com> 0.1-20110923
- version changed
- spec file improved
- README-Fedora created
* Wed Sep 7 2011 Petr Sklenar <psklenar at, redhat.com> 1-2
- make script being executable
* Wed Aug 31 2011 Petr Sklenar <psklenar at, redhat.com> 1-1
- Initial commit