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vpn-attacks/README.md

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Initial commit
3 years ago
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adding original attack test scripts and demos
3 years ago
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  1. # vpn-attacks
  4. ##### Attack Machine Environment
  6. * C++
  7. * libtins (http://libtins.github.io/download/)
  10. ## Server-side attack
  13. #### Requirements
  15. * VPN client connected to a VPN server
  16. * Attack machine sitting somewhere in between VPN server and client forwarding all traffic between the two
  18. ***Note:*** Full virtual test environment setup for the server-side attack is detailed in the README within the `virt-lab` folder
  21. #### Running the DNS Attack Script
  23. 1. Change to udp-dns attack folder - `cd other-end-attack/dnuss/full_scan`
  24. 2. Compile attack script - `make`
  25. 3. Check to make sure vpn server has a conntrack entry for some vpn client's dns lookup (on vpn-server vm): `sudo conntrack -L | grep udp`
  26. 3. Try to inject from attack router - `sudo ./uud_send <dns_server_ip> <src_port (53)> <vpn_server_ip> <start_port> <end_port>`
  30. ## Client-side attack
  33. #### Requirements
  35. * VPN client connected to a VPN server
  36. * Reverse path filtering disabled on the VPN client machine
  37. * Attack router acting as the local network gateway for the victim (VPN client) machine
  40. #### Running the Full Attack Script
  42. * Rebuild all the attack scripts: `./rebuild_all.sh`
  43. * `cd full_attack`
  44. * Change `attack.sh` vars to appropriate values
  45. * `sh attack.sh <remote_ip>`
  47. ***Note:*** `remote_ip` specifies the IP address of the HTTP site.
  50. #### Testing Indivual attack phases
  53. ##### Phase 1 - Infer victim's private address
  55. * `cd first_phase`
  56. * `python3 send.py <victim_public_ip> <private_ip_range>`
  58. ***Note:*** `private_ip_range` specifies a `/24` network such as `10.7.7.0`.
  61. ##### Phase 2 - Infer the port being used to talk to some remote address
  63. * `cd sec_phase`
  64. * Edit `send.cpp` to use the correct MAC addresses
  65. * `g++ send.cpp -o send -ltins`
  66. * `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip>`
  68. ***Note:*** `<remote_ip>` is the address we wanna check if the client is connected to and the `<remote_port>` is almost always 80 or 443. The `<victim_wlan_ip>` is the public address of the victim and `<victim_priv_ip>` was found in phase 1. If the scripts not sniffing any challenge acks, then edit the `send.cpp` file to uncomment the `cout` line that prints out the remainder to check if the size of the encrypted packets has slightly changed on this system.
  71. ##### Phase 3 - Infer exact sequence number and in-window ack
  73. * `cd third_phase`
  74. * Edit `send.cpp` to use the correct MAC addresses
  75. * `g++ send.cpp -o send -ltins`
  76. * `./send <remote_ip> <remote_port> <victim_wlan_ip> <victim_priv_ip> <victim_port>`
  79. ***Note:*** `<victim_port>` was found in phase 2. This script currently just injects a hardcoded string into the TCP connnection but could be easily modified.