Asi performing-fuzzing-with-aflplusplus

install

source · Clone the upstream repo

git clone https://github.com/plurigrid/asi

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/plurigrid/asi "$T" && mkdir -p ~/.claude/skills && cp -r "$T/plugins/asi/skills/performing-fuzzing-with-aflplusplus" ~/.claude/skills/plurigrid-asi-performing-fuzzing-with-aflplusplus && rm -rf "$T"

manifest: plugins/asi/skills/performing-fuzzing-with-aflplusplus/SKILL.md

Performing Fuzzing with AFL++

Overview

AFL++ is a community-maintained fork of American Fuzzy Lop (AFL) that provides coverage-guided fuzzing for compiled binaries. It instruments targets at compile time or via QEMU/Unicorn mode for binary-only fuzzing, then mutates input corpora to discover new code paths. AFL++ includes advanced scheduling (MOpt, rare), custom mutators, CMPLOG for input-to-state comparison solving, and persistent mode for high-throughput fuzzing.

When to Use

When conducting security assessments that involve performing fuzzing with aflplusplus
When following incident response procedures for related security events
When performing scheduled security testing or auditing activities
When validating security controls through hands-on testing

Prerequisites

AFL++ installed (
```
apt install afl++
```
or build from source)
Target binary source code (for compile-time instrumentation) or QEMU mode for binary-only
Initial seed corpus of valid inputs for the target format
Linux system with /proc/sys/kernel/core_pattern configured

Steps

Instrument the target binary with
```
afl-cc
```
or
```
afl-clang-fast
```
Prepare seed corpus directory with minimal valid inputs
Minimize corpus with
```
afl-cmin
```
to remove redundant seeds
Run
```
afl-fuzz
```
with appropriate flags (-i input -o output)
Monitor fuzzing progress via afl-whatsup and UI stats
Triage crashes with
```
afl-tmin
```
minimization and CASR/GDB analysis
Report unique crashes with reproduction steps

Expected Output

+++ Findings +++
  unique crashes: 12
  unique hangs: 3
  last crash: 00:02:15 ago
+++ Coverage +++
  map density: 4.23% / 8.41%
  paths found: 1847
  exec speed: 2145/sec