Memory Safety & Buffer Overflow Exploitation
Intermediate90 min5 objectives

Memory Safety & Buffer Overflow Exploitation

Complete Memory Safety & Buffer Overflow Exploitation in a deterministic practice workspace without depending on unavailable host, cloud, hardware, desktop, or multi-node infrastructure.

Briefing

### Scenario You are a general practitioner handling a realistic client engagement. For Memory Safety & Buffer Overflow Exploitation, the client has provided a staging environment that mirrors production but is isolated to this lab. Your task is to demonstrate the core technique on the local target without touching external systems. The scenario is intentionally scoped to what you can verify inside the container. ### Environment and scope Use the Ubuntu 22.04 practice container. Working directory is `/home/student/lab-work` (create it with `mkdir -p`). Target is `127.0.0.1` and `127.0.0.1:8080` where a `python3 -m http.server` or service-specific daemon runs. Install only needed tools via `sudo apt-get update && sudo apt-get install -y curl, python3, nmap, openssl` then verify with `curl --version && python3 --version`. Credentials: `student:lab123` with `sudo` (created via `useradd` + `chpasswd` + `sudoers.d` as in `labs.service.ts:554`). Do not scan or query outside 127.0.0.0/8 or lab-work. Scope is strictly container-only; no external cloud, hardware, or nested container engines. ### Mission objective For Memory Safety & Buffer Overflow Exploitation: install and verify tooling, prepare the local target (`127.0.0.1 and /home/student/lab-work`), execute the technique step-by-step, and collect evidence. Each walkthrough step produces a verifiable artifact (file, command output, or service state) that you will cite in your submission. ### Success criteria You have completed the lab when: - Tooling verification passes (`curl --version && python3 --version` returns expected version without error) - Local target is running and responds (`curl -s http://127.0.0.1:8080/` or `dig @127.0.0.1` or `tshark -r` shows expected output) - `solution.md` in `lab-work` documents each step's exact command, raw output excerpt, and your interpretation (what the output proves) - All flag answers are direct values from your local output (e.g., version string, status code, IP, header name) and no external hosts were targeted (`history | grep -E "nmap|dig|tshark|openssl|nikto|curl"` shows only 127.0.0.1) Runtime mode: portable artifact validation

Objectives

  • 1Prepare workspace and verify tooling
  • 2Prepare local target for Memory Safety & Buffer Overflow Exploitation
  • 3Execute Memory Safety & Buffer Overflow Exploitation technique
  • 4Capture evidence
  • 5Complete Buffer Overflower
  • 6Complete Format String Attacker
  • 7Tune and interpret
  • 8Compile and verify submission

Flags

Buffer Overflower+300 pts

Submit the verifiable output value for Buffer Overflower as produced by the local tool on 127.0.0.1 (e.g., version, status, IP, or header).

ROP Chain Builder+300 pts

Submit the verifiable output value for ROP Chain Builder as produced by the local tool on 127.0.0.1 (e.g., version, status, IP, or header).

Format String Attacker+250 pts

Submit the verifiable output value for Format String Attacker as produced by the local tool on 127.0.0.1 (e.g., version, status, IP, or header).

ASLR Bypasser+300 pts

Submit the verifiable output value for ASLR Bypasser as produced by the local tool on 127.0.0.1 (e.g., version, status, IP, or header).

Canary Protector+150 pts

Submit the verifiable output value for Canary Protector as produced by the local tool on 127.0.0.1 (e.g., version, status, IP, or header).

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