Technical Overview
Mobile app security is a constant game of cat and mouse. During a VAPT engagement for a regional fintech application, our team hit an architecture mismatch first: our emulators run x86_64, but the target was compiled strictly for arm64-v8a. After configuring ABI translation, we hit the real wall — proxy-unaware networking and SSL pinning.
Instead of relying on memory hooking, we investigated the application's network trust configuration and identified a configuration weakness that allowed controlled traffic inspection.
Result: full TLS traffic visibility on a build the client believed was properly protected. The root cause was a global HTTP override left enabled in the UAT build that trusted an injected certificate authority.
Impact
Full traffic visibility on a build the client believed was pinned and production-safe.
Recommendation
Enforce certificate pinning only in verified production builds, remove debug network overrides before release, and add controls to detect repackaged applications and unexpected traffic routing.
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