Which mobile device vulnerability occurs when a smartphone user installs an app from a source other than the platform's official app store, thereby bypassing the built-in security screening provided by the operating system?
Jailbreaking
Buffer overflow
Side loading
Zero-day exploit
Side loading refers to manually installing an application package that has not passed through the official app store (for example, Google Play or the Apple App Store). Because the app has not been vetted, it may contain malware or malicious code, and the device's normal permission and code-signing checks can be evaded. By contrast, jailbreaking removes OS restrictions entirely, buffer overflows are memory-handling flaws, and zero-day exploits target previously unknown vulnerabilities-none of which specifically describe installing apps from untrusted sources.
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