Ipzz-447 May 2026

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.

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. ipzz-447

$ file ipzz-447
ipzz-447: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, stripped
$ checksec --file=ipzz-447
RELRO           STACK CANARY  NX            PIE             RPATH      RUNPATH     SYMBOLS
Full RELRO      No           Yes           No              No         No          No

The algorithm is linear in the sense that each step only depends on the previous accumulator and the current character.
We can solve for each character backwards: The capsule’s journey after the Y’thara’s demise is

Let b_i be the accumulator after processing i characters.
b_i = (b_i-1 << 5) ^ (c_i - '0')
=> (c_i - '0') = b_i ^ (b_i-1 << 5)

Starting from the final b_16 = 0x4e5c0d3a3c1e0b2f and working backwards, we can recover each c_i.
The easiest way is to brute‑force the 16‑byte input by forward simulation because the search space is tiny (each character is limited to printable ASCII that after - '0' stays in the range 0‑9; however the original code does not enforce that – any byte works). Therefore we can simply search for a string that reproduces the same b. $ file ipzz-447 ipzz-447: ELF 64-bit LSB executable,

| 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. |

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