During an internal penetration test you locate several Android phones on the corporate Wi-Fi with TCP port 5555 open. Nmap indicates an unauthenticated ADB service is running, even though USB debugging is disabled by policy. You want to silently push a backdoored APK onto one device. Which mobile attack vector is the most appropriate?
Exploit a vulnerable WebView component to trigger a drive-by APK download when the user visits a compromised site.
Craft a Stagefright MMS that silently drops and installs the malicious APK on receipt.
Use the unauthenticated ADB service on port 5555 to connect remotely and run adb install to sideload the malicious APK.
Send a phishing SMS with a QR code that links to the malicious application on a fake app-store page.
When Android Debug Bridge is left listening on TCP port 5555 without RSA key authentication, any host on the same network can issue commands. A tester can run "adb connect :5555" followed by "adb install <malware.apk>" to sideload a malicious application without user interaction. Stagefright MMS, phishing QR codes, and WebView exploits require additional vulnerabilities or user actions and do not exploit the exposed ADB service directly.
Ask Bash
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What is ADB (Android Debug Bridge) and its role in mobile device testing?
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How does the 'adb install' command work to sideload applications?
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Why is TCP port 5555 a vulnerability for Android devices?
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What is Android Debug Bridge (ADB) and how does it work?
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Why is TCP port 5555 significant in the context of ADB vulnerabilities?
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What is sideloading, and why is it used in this attack?
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