TLS Attacks

Sweet 32 attack

1. First, identify a target that is using a vulnerable cipher, such as 3DES.

2. Launch a Man-in-the-Middle (MITM) attack to intercept the target's encrypted traffic. This can be done using a tool such as Ettercap or Arpspoof.

3. Use a tool such as Wireshark to capture the intercepted traffic.

4. Once the traffic has been captured, use a tool such as Sweet32 to decrypt the captured 3DES traffic. Here are the commands to use Sweet32:

   bashCopy code# Clone Sweet32 repository
   git clone https://github.com/nccgroup/sweet32.git
   
   # Install required dependencies
   sudo apt-get update
   sudo apt-get install build-essential libssl-dev
   
   # Compile Sweet32
   cd sweet32
   make

5. Once Sweet32 has been compiled, use it to decrypt the captured 3DES traffic. Here is the command to use:

   phpCopy code./sweet32 -t <target_IP> -p <target_port> -c <ciphertext_file> -s <session_key_file> -d <decrypted_file>

   Replace <target_IP> with the IP address of the target, <target_port> with the port used for the encrypted traffic, <ciphertext_file> with the file containing the captured traffic, <session_key_file> with a file to store the session key, and <decrypted_file> with a file to store the decrypted traffic.

6. Analyze the decrypted traffic to look for sensitive information, such as login credentials or other confidential data.

Mitigation:

To reconfigure an SSL/TLS server to disable support for obsolete 64-bit block ciphers, follow these steps:

1. Identify the 64-bit block ciphers that are currently supported by the server. This can be done by reviewing the server's SSL/TLS configuration or by using a tool like OpenSSL to check the cipher suite. The ciphers to be disabled include those that use 64-bit block sizes, such as DES and 3DES.

2. Disable the identified 64-bit block ciphers in the server's SSL/TLS configuration. This can be done by editing the server's configuration file to remove the ciphers from the list of supported ciphers.

3. Restart the SSL/TLS server to apply the new configuration.

4. Verify that the server is no longer supporting the obsolete 64-bit block ciphers. This can be done by reviewing the server's SSL/TLS configuration or by using a tool like OpenSSL to check the cipher suite.