evidence

Evidence: PoC Capture & Redaction Discipline

Run this BEFORE attaching any screenshot, HAR, or request/response to a finding report.

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Pre-Screenshot Checklist

[ ] Network tab Headers panel collapsed or out of frame
[ ] Burp Request panel hidden behind divider
[ ] No "Copy as cURL" output visible on screen
[ ] DevTools Application -> Cookies tab closed
[ ] Browser URL bar does not show a session token in query string

Cookie / Token Redaction

Must redact:

• Session cookie value (authn, session, sid, __Secure-id, etc.)
• CSRF tokens bound to the session
• Authorization headers (Bearer tokens, JWT)
• Cookie and Set-Cookie header values for session-bearing cookies

Safe to leave:

• Cloudflare cookies (__cf_bm, _cfuvid)
• Analytics cookies (_ga, ajs_anonymous_id)
• Trace IDs (x-datadog-trace-id, x-request-id) - help triager correlate logs

Redaction method: black rectangle annotation over the cookie value in your image editor. OR use DevTools credentials: 'include' in fetch PoC so cookies never appear in the screenshot.

HAR Sanitization

# Save this as ~/bin/sanitize_har
sanitize_har() {
  local input="$1"
  local output="${1%.har}.sanitized.har"
  jq '
    .log.entries |= map(
      (.request.headers |= map(
        if .name | ascii_downcase | IN("cookie", "authorization", "x-csrf-token")
        then .value = "<REDACTED>" else . end
      )) |
      (.response.headers |= map(
        if .name | ascii_downcase | IN("set-cookie") then .value = "<REDACTED>" else . end
      )) |
      (.request.cookies |= map(.value = "<REDACTED>")) |
      (.response.cookies |= map(.value = "<REDACTED>"))
    )
  ' "$input" > "$output"
  echo "Sanitized: $output"
}
# Verify:
grep -i 'authorization\|"cookie"\|set-cookie' "${1%.har}.sanitized.har" | head -5

PII Black-Bar Protocol

When PoC exposes another user's data (IDOR, etc.):

• Mask: real names, email local part, phone last 7 digits, addresses, faces
• Leave: JSON key names, your own test-account UID, trace IDs, request shape