DEF CON 33 - Bypassing Intent Destination Checks, LaunchAnyWhere Privilege Escalation - Qidan He

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A new class of Android vulnerabilities, known as bad resolve, exploits implicit intent resolution to achieve privilege escalation by manipulating the resolution result during intent processing. This vulnerability allows attackers to bypass security checks and launch privileged or protected activities—despite them being unexported or restricted—by leveraging timing windows between intent resolution steps and using malformed manifests to extend resolution time. The attack relies on the search trampoline activity as a gadget that enables arbitrary activity launches via intent injection. The vulnerability is not limited to a single use case and can be chained through device-specific implementations (e.g., Xiaomi or Honor choosers), allowing attackers to bypass additional checks. The speaker demonstrates that this vulnerability exists in multiple Android code snippets across the open-source codebase and has led to at least two reported CVEs. A proposed automated framework using ARM (Android Runtime Monitoring) and MCP (Model-based Code Prompting) is introduced to detect such vulnerabilities, though it currently suffers from false positives and false negatives.

Source: https://www.youtube.com/watch?v=e7UnYV-m23c&t=1080

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