Add skill: bypassing-ssl-pinning-in-flutter-apps - #104
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New mobile-security skill covering HTTPS interception of Flutter (Dart) apps, which resist standard mobile MITM because traffic runs through a statically-linked BoringSSL in libflutter.so that ignores the system proxy and validates certs in native code. Existing pinning-bypass skills target the platform TLS stack and do not apply. Covers: Flutter build detection, forcing proxy-blind traffic through Burp (reFlutter forced proxy and a PCAPdroid + gost SOCKS bridge), defeating BoringSSL validation (reFlutter patch or Frida pattern hook on the stripped engine), and selectively routing Firebase/native-SDK auth around the proxy so App Check and OTP login keep working during interception. Android and iOS. Passes tools/validate-skill.py. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Adds a new
mobile-securityskill: bypassing-ssl-pinning-in-flutter-apps.Flutter apps resist normal mobile interception because
dart:ioHttpClientruns on a statically-linked BoringSSL compiled intolibflutter.so/ the iOSFlutterframework. It ignores the system proxy and validates certificates in native code, so a user CA + Objection/Frida "universal" Java/ObjC hooks do not work. The existingperforming-mobile-app-certificate-pinning-bypassskill targets the platform TLS stack and does not cover this case — this fills that gap.What it covers
gostSOCKS5→HTTP bridge.scripts/flutter-tls-bypass.js, with placeholder patterns pointing to the maintained NVISO set).gostbypass=) so auth succeeds legitimately while first-party API traffic is still intercepted. This is selective routing, not an auth bypass.Conventions
SKILL.mdstructure (Overview → When to Use → Prerequisites → Workflow → Key Concepts → Tools & Systems → Common Scenarios → Output Format) withreferences/standards.md,references/workflows.md, andscripts/.nist_csf(PR.DS-01/02, ID.RA-01) andmitre_attack(T1557, T1040) mappings; MASVS-NETWORK/RESILIENCE noted in the standards reference.tools/validate-skill.py.🤖 Generated with Claude Code