Mobile › Module 7 › Lesson 3
Secure Coding Mobile
Mobile secure coding literacy — storage, crypto, auth, WebView, logging — defender fixes on $MOB_LAB findings.
Visual · t27_secure_coding_mobile
Secure coding = named mobile dev pitfalls + fixes. $MOB_LAB. Original Cyberlium.
Opening
Most mobile findings are dev mistakes — name the secure coding patterns defenders ask for after YOUR lab review.
Secure coding mobile literacy for defenders: avoid hardcoded secrets and API keys in APK/IPA; use platform Keychain/Keystore correctly; no sensitive data in logs; validate SSL/TLS (pinning as defense — bypass refused Module 5); WebView JavaScript bridge risks; root/jailbreak detection as resilience signal not sole control; least-privilege permissions; secure random and IV discipline. Map each pattern to MASVS V2/V3/V7 rows. Cyberlium on $MOB_LAB code review of intentional vulnerable samples — recommend fixes, not exploit weaponization. Refused: embedding malware in lab apps, stealing real API keys from prod apps, publishing exploit PoC against unauthorized targets. Lab row: five coding anti-patterns with fix and MASVS-ID each.
1. Named anti-patterns
Hardcoded secrets, world-readable files, log leakage, weak WebView config, bad crypto primitives — five minimum.
Each pairs with platform-native fix (Keychain, Keystore, ProGuard/R8 note at literacy).
Command guide
Try these commands — Named anti-patterns
═══ TOOLS & WEBSITES ═══ Browse / read these (authorized learning only — stay in YOUR lab / program scope)
Android secure coding — https://developer.android.com/privacy-and-security/security-tips OWASP MASVS storage — https://mas.owasp.org/MASVS/0x02-MASVS-STORAGE/ Apple secure coding — https://developer.apple.com/documentation/security
═══ INSTALL ═══
Linux (Debian/Ubuntu):
Command — copy this
sudo apt install python3
macOS:
Command — copy this
brew install python3
Windows: Download https://python.org/downloads/
═══ LINUX / macOS ═══
Command — copy this
export MOB_LAB=${MOB_LAB:-$HOME/cyberlium-lab/t27-mob}
python3 - <<'PY'
fixes = [
'Use Android Keystore / iOS Keychain — not plaintext SharedPreferences',
'Disable android:allowBackup for sensitive apps',
'Network security config: TLS 1.2+ only',
'Minimize exported components; validate all intents',
]
print('Secure coding literacy (YOUR lab app checklist):')
for f in fixes: print(f' - {f}')
PYCommand — copy this
grep -E 'hardcoded|allowBackup|exported' "$MOB_LAB/notes/manifest-review.txt"
Primary tools to practice this lesson: python3, grep. Reference sites: Android secure coding (https://developer.android.com/privacy-and-security/security-tips); OWASP MASVS storage (https://mas.owasp.org/MASVS/0x02-MASVS-STORAGE/); Apple secure coding (https://developer.apple.com/documentation/security). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.
2. Defender handoff
Finding → MASVS-ID → secure coding fix → retest MASTG-ID — closed loop vocabulary.
Resilience checks supplement — never replace storage/crypto fixes.
3. Scope refuse
No weaponized PoC against stranger apps; no exfiltration of real user data from prod.
Fix recommendations on $MOB_LAB samples only unless brief assigns authorized scope.
4. What you ship: secure coding fix table
Five anti-patterns + fix + MASVS-ID + NEVER weaponized PoC line.
5. What you record before the next lesson
Secure coding fix table path.
6. Wrong vs right: stranger phones vs lab emulator apps
Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.
Wrong
Extract real API keys from production app and publish as 'secure coding example.'
Right
Secure coding fix table from $MOB_LAB review. Next: MASVS Lab.
Mission: secure coding fix table
1) List five mobile anti-patterns. 2) Platform fix per pattern. 3) MASVS-ID link each. 4) Write NEVER unauthorized PoC line.
Stuck? Ask Cyberlium AI Mentor
Ask Mentor: “WebView addJavascriptInterface — MASVS map?”
Knowledge Check
APPLY: Hardcoded API keys violate:
Multiple choice
Knowledge Check
APPLY: True or False: Log sensitive tokens is acceptable mobile practice.
True or False
Knowledge Check
APPLY: Secure coding handoff includes:
Multiple choice