ICS/SCADA › Module 3 › Lesson 3
Availability Bias
Availability bias literacy names uptime pressure, maintenance windows, and deferred patching tradeoffs on YOUR $OT_LAB — defensive OT literacy only; no real-plant attacks, unauthorized OT scans, or exploit cookbooks.
Visual · t38_availability_bias
Availability Bias literacy. $OT_LAB only. Original Cyberlium.
Opening
OT leaders may accept risk to avoid downtime — literacy names availability bias so defenders document tradeoffs honestly.
Manufacturing lines, utilities, and pipelines lose revenue every minute offline. Availability bias pushes deferred patching and permissive remote access — defenders document risk acceptance and compensating controls on fictional scenarios. Cyberlium Topic 38 practices on $OT_LAB — YOUR fictional OT templates, zone diagrams, and labeled checklists under $HOME/cyberlium-lab/t38-ot/ no real-plant attacks, unauthorized OT scans, or exploit cookbooks. Next: OT IT Lab.
1. What Availability Bias covers (named)
Availability literacy: RTO/RPO for OT apps, maintenance windows, redundant controllers, hot standby. Bias appears when uptime overrides known vulnerabilities without documented acceptance. On $OT_LAB, document literacy rows on fictional LAB-OT-001 — never live plant IPs, credentials, or exploit steps.
Write availability tradeoff row — deferred patch, compensating control, review date. On LAB-OT-001 fictional scenario only. On $OT_LAB, document literacy rows on fictional LAB-OT-001 — never live plant IPs, credentials, or exploit steps.
Command guide
Try these commands — What Availability Bias covers (named)
═══ TOOLS & WEBSITES ═══ Browse / read these (authorized learning only — stay in YOUR lab / program scope)
NIST SP 800-82 — https://csrc.nist.gov/publications/detail/sp/800-82/rev-3/final
═══ INSTALL ═══
Linux (Debian/Ubuntu):
Command — copy this
sudo apt install python3
macOS:
Command — copy this
brew install python3
Windows: Download https://python.org/downloads/
═══ LINUX / macOS ═══
Command — copy this
export OT_LAB=${OT_LAB:-$HOME/cyberlium-lab/t38-ot}
cat > "$OT_LAB/notes/availability-bias.txt" <<'EOF'
Availability bias — NAMED:
Uptime pressure may defer OT patches
Document compensating controls + review date
Example fictional: deferred PLC firmware — monitor + segmentation
EOFCommand — copy this
grep -E 'defer|compensating|review date' "$OT_LAB/notes/availability-bias.txt"
Primary tools to practice this lesson: grep, python3. Reference sites: NIST SP 800-82 (https://csrc.nist.gov/publications/detail/sp/800-82/rev-3/final). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.
2. Why Availability Bias matters for defenders
Honest risk acceptance beats silent vulnerability debt. Board and operations need readable tradeoff notes. On $OT_LAB, document literacy rows on fictional LAB-OT-001 — never live plant IPs, credentials, or exploit steps.
Students draft tradeoff cards on lab templates. Production follows formal risk acceptance workflows. On $OT_LAB, document literacy rows on fictional LAB-OT-001 — never live plant IPs, credentials, or exploit steps.
3. $OT_LAB boundary
Forbidden: hiding open OT vulns because 'plant cannot stop'. Allowed: availability tradeoff literacy with review date. On $OT_LAB, document literacy rows on fictional LAB-OT-001 — never live plant IPs, credentials, or exploit steps.
Ship: availability tradeoff card. Next: OT IT Lab.
4. What you ship: availability bias card for $OT_LAB
Availability bias literacy names uptime pressure, maintenance windows, and deferred patching tradeoffs. $OT_LAB named. NEVER real-plant attack steps. chmod 600.
5. What you record before the next lesson
Date (UTC). Availability Bias card. $OT_LAB named. File t38-m03-l03-availability-bias.txt chmod 600.
6. Wrong vs right: plant attacks vs YOUR OT lab sims
Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.
Wrong
Skip documenting deferred OT patch because operations said no.
Right
Write availability bias card for YOUR $OT_LAB. Next: OT IT Lab.
Mission: document Availability Bias on YOUR OT lab
1) Name literacy rows on $OT_LAB. 2) Write NEVER list (no real-plant attacks, unauthorized OT scans, or exploit cookbooks). 3) chmod 600. Never scan or exploit real industrial networks.
Stuck? Ask Cyberlium AI Mentor
Ask Mentor: literacy on $OT_LAB — not attack recipes against live plants.
Knowledge Check
APPLY: Availability Bias on Cyberlium means:
Multiple choice
Knowledge Check
APPLY: True or False: Topic 38 includes ICS attack cookbooks against real plants.
True or False
Knowledge Check
APPLY: Availability Bias literacy on Cyberlium uses:
Multiple choice