Ipzz-447 May 2026

The stack layout for the vulnerable function:

| buffer[64] |
| saved RBP  |  (8 bytes)
| ret addr   |  (8 bytes) <-- overwrite this

Thus we need 64 + 8 = 72 filler bytes, followed by the new return address (0x4012ac).

Because the binary uses the System V AMD64 calling convention, the puts call expects the flag address in RDI. The original code loads RDI before the call, so we can just jump to the exact instruction that already does the lea rdi, [rip+...] and call puts. No additional gadget is needed.

IPZZ-447 is a designation for a [device/standard/project/paper] that addresses [core area—e.g., network protocol design, industrial sensor, medical device specification, security vulnerability]. It focuses on improving reliability, interoperability, and performance in its domain through defined interfaces, testing procedures, and compliance requirements. ipzz-447

The Y’thara’s archive was not a passive relic; it contained an active seed—a compact, self‑replicating code designed to rebuild their Lattice of Echoes on any suitable substrate. The Chronos‑Seekers faced an impossible choice:

After intense debate, the guild voted to integrate the seed into a controlled experimental environment—a deep‑sea laboratory on Europa’s ocean floor, where the silicate‑rich hydrothermal vents could serve as a cradle. The core was placed in a pressure‑sealed chamber, its qubits interfaced with a biomechanical substrate engineered to emulate the Y’thara’s crystalline lattice.

Months later, the first synthetic filaments began to grow, humming in resonance with Europa’s geysers. The Y’thara were reborn, not as conquerors, but as co‑inhabitants of a frozen world, sharing their ancient wisdom and new perspectives on existence. The stack layout for the vulnerable function: |

(Note: I assume "IPZZ-447" is an identifier for a standard, code, device model, research paper, incident, or project. If you meant something else, tell me and I’ll adapt.)

Disassembly of the if (strcmp(buf, phrase) == 0) block:

4012a0:  cmp    eax,0
4012a3:  jne    4012c0          ; jump to “incorrect” branch
4012a5:  lea    rdi,[rip+0x1234] ; address of the flag string
4012ac:  call   puts@plt
4012b1:  jmp    4012e0          ; exit path

The address of puts is at 0x401030 (PLT entry). The address of the flag string is at 0x601060. The address of the puts call (the instruction after loading the flag) is 0x4012ac. Jumping directly to 0x4012ac will print the flag and then continue to the exit path. Thus we need 64 + 8 = 72

$ gdb -q ipzz-447
(gdb) run
Welcome to ipzz-447!
> 

Set a breakpoint on main and step through:

(gdb) b *0x4010c0   # address of main (found via `info files` or `objdump -d`)
(gdb) run

Stepping through the function reveals:

The correct phrase is also present in the binary (checked via x/s on the address referenced by the strcmp call). It turns out to be:

0x601050:  "puzzling_is_fun"

When the phrase matches, the program prints the flag. Otherwise it loops.