EC-Council Certified Ethical Hacker (CEH) v12Mobile Platform, IoT, and OT HackingHard
A security team is analyzing a new type of ransomware that specifically targets Android devices. They observe that the ransomware encrypts user data and then attempts to gain root privileges to prevent removal and ensure persistence. Which Android vulnerability or mechanism is the ransomware most likely exploiting to achieve root privilege escalation on unrooted devices?
- AUtilizing an insecure implementation of inter-process communication (IPC).
- BExploiting a vulnerability in the Android WebView component.
- CPerforming a brute-force attack on the device's screen lock.
- DLeveraging a kernel vulnerability via a custom system call.
Show answer & explanationAnswer & explanation
Correct answer: D. Leveraging a kernel vulnerability via a custom system call.
To gain root privileges on an unrooted Android device, ransomware typically exploits a kernel vulnerability. The kernel is the core of the operating system, and a vulnerability there can allow an attacker to execute arbitrary code with elevated (root) privileges, bypassing Android's security sandbox and user permissions.
Why the other options are wrong
- A. Insecure IPC can lead to privilege escalation between apps, but usually not to full root access from a standard application without a kernel exploit.
- B. WebView vulnerabilities usually lead to remote code execution within the app's sandbox, not direct root privilege escalation.
- C. Brute-forcing the screen lock gains user access, not system root privileges.
Android Kernel Exploit
A software vulnerability in the Android operating system's kernel that can be leveraged by malicious applications to gain unauthorized root privileges on the device.
- Bypasses standard Android security mechanisms.
- Grants full control over the device and its data.
- Often involves complex low-level programming to interact with kernel memory.
Memory trick: To root an unrooted Android, the 'kernel' is the king's weak spot.