These assignments were part of my undergrad coursework at Sharif UT.

Buffer Overflow Attack

Buffer overflow is a kind of control hijacking attacks that targets for taking over target machine. For more information refer to the link.

Here we have three different vulnerable programs to exploit:

• prog_vuln1 does not have defensive structures, and the exploitation is performed through commandline arguments.
• In the prog_vuln4, stack is non-executable, so the attacker should use ROP.
• prog_vuln3 makes use of canary mechanism in addition to NX feature, and format string is a possibility for the attacker to exploit.

Crime Attack

If we compress two strings of equal length, the instance having more frequent words would become shorter than the other one. Therefore, compression can serve as a vulnerability.

Here, we have a server available at this link setting a cookie in our browser including a ciphertext which our job is to decipher. This cookie is based on a dictionary-based encoding that takes input, the Get parameter.

Diffie-Hellman MITM Attack

In this attack, attacker comes between a client and a server, and exchanges Diffie-Hellman protocol keys with them, so that he is able to decipher their communication in a way they don't realize. FMI refer to this link

Here, we have a virtual machine that simulates a client that connects to a server and establishes an encoded communication using Diffie-Hellman protocol to convey a flag. Our job is at first poisoning their ARP cache and then key exchanging to foolish them so that we are able to intercept their intended communication.

P.S: If you needed the virtual machine, don't hesitate to contact me!