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Mod 7 · Les 2/5
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Module 7•Lesson 2 of 5•⏱️ 15 min read•Beginner+39 XP

Findings Triage

Severity, reachability, and false positives — triage SAST on YOUR $REPO findings.

Findings Triage
00:00/02:44

Visual · t17_findings_triage

Not every SAST hit is a bug — triage before panic. Original Cyberlium.

A thousand findings mean nothing until you sort signal from noise on code you can fix.

Triage SAST results: read rule ID and message, confirm sink/source in YOUR code path, check if dead code or test-only, rate severity (CWE mapping literacy), decide fix vs suppress with ticket. Document suppressions with justification and expiry — never blanket ignore rules on $REPO to greenwash CI. Practice triage on lab findings you introduced and removed — never publish stranger repo scan dumps or shame open-source maintainers with unverified reports.

1. Triage steps

Reproduce in source — click through file:line. Ask: attacker-controlled input reaches sink?

Check framework defaults — some rules misfire on safe wrappers.

Command guide

Try these commands — Triage steps

═══ LINUX / BASH (Network & Reconnaissance Audit) ═══

Scan target host for open ports and service version signatures

Command — copy this

nmap -sS -sV -p 80,443,8080 -Pn ${LAB_HOST:-127.0.0.1}

DNS and WHOIS reconnaissance on authorized domain

Command — copy this

dig +short A target.local
dig +short MX target.local
whois target.local 2>/dev/null | grep -iE "(Registrar|Creation Date|Name Server)" | head -6

Inspect HTTP headers for technology stack fingerprinting

Command — copy this

curl -s -I "http://${LAB_HOST:-127.0.0.1}:8080" | grep -iE "(Server|X-Powered-By|Set-Cookie|Content-Security-Policy)"

Primary tools to practice this lesson: grep, python3. Reference sites: SAST triage (https://cheatsheetseries.owasp.org/cheatsheets/Source_Code_Analysis_Tools_Cheat_Sheet.html); Semgrep (https://semgrep.dev/docs/). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.

2. Severity literacy

Critical: auth bypass, RCE pattern in reachable code. Low: style or test fixture.

CWE IDs link to teaching material — use for notes, not Twitter dunking.

3. Suppression discipline

Inline nosemgrep with reason + issue link — not delete the rule globally without review.

Re-scan after fix; confirm finding count drops on $REPO.

4. What you ship: triage worksheet

Five triage steps + one worked example from $REPO + suppression policy line.

5. What you record before the next lesson

Triage worksheet path.

6. Wrong vs right: stranger apps vs YOUR repo

Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.

  • Wrong: File public GitHub issue on stranger repo from unverified SAST hit.
  • Right: Name triage steps. Next: CI gate.
Hands-on Exercise

Mission: triage one finding

1) Run SAST on $REPO. 2) Triage one true and one false positive. 3) Write NEVER dump stranger scan results publicly.

Pro Tip

Stuck? Ask Cyberlium AI Mentor

Ask Mentor: “When is nosemgrep acceptable?”

Practice QuizQuestion 1
Multiple choice
Q1

APPLY: Triage first asks:

Practice QuizQuestion 2
True or False
Q2

APPLY: True or False: Blanket ignore all SAST rules is good.

Practice QuizQuestion 3
Multiple choice
Q3

APPLY: Suppression should include:

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