CVE-2020-0332 in Android
Summary
by MITRE
In libstagefright, there is a possible dead loop due to an uncaught exception. This could lead to remote denial of service with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-124783982
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-0332 resides within the libstagefright media framework component of Android operating systems, specifically affecting Android 11 and earlier versions. This issue manifests as a potential dead loop caused by an uncaught exception within the media processing pipeline, representing a significant security concern that could be exploited remotely without requiring any special privileges or user interaction beyond the initial media file delivery. The vulnerability demonstrates the critical nature of media processing components in mobile operating systems, where improper exception handling can lead to system instability and service disruption.
The technical flaw occurs within the stagefright framework's media parsing and decoding mechanisms, where an unhandled exception during media file processing can trigger an infinite loop or deadlock condition. This particular vulnerability falls under CWE-400, which specifically addresses "Uncontrolled Resource Consumption," and more precisely aligns with CWE-691, "Insufficient Control Flow Management." The issue stems from the framework's inability to properly handle malformed or maliciously crafted media files during the parsing process, leading to a scenario where the processing thread becomes trapped in an indefinite loop, consuming system resources and rendering the media processing functionality unavailable.
The operational impact of this vulnerability extends beyond simple denial of service, as it can effectively cripple media processing capabilities on affected Android devices, potentially affecting applications that rely on media playback functionality. Attackers can exploit this weakness by delivering specially crafted media files that trigger the unhandled exception, causing the affected device to become unresponsive or crash entirely. This vulnerability operates under the ATT&CK framework's T1499.004 technique, which covers "Resource Hijacking: Unnecessary Resource Consumption," and demonstrates how media processing components can be weaponized to exhaust system resources. The vulnerability's remote exploitation capability makes it particularly dangerous as it can be triggered through various attack vectors including email attachments, web downloads, or messaging applications.
Mitigation strategies for CVE-2020-0332 involve implementing proper exception handling mechanisms within the stagefright framework to prevent uncaught exceptions from causing system-level dead loops. Android security patches released in Q2 2020 addressed this vulnerability by introducing enhanced error handling and resource management within the media processing components. Organizations should ensure their Android devices are updated to the latest security patches, as the vulnerability was remediated through proper exception handling implementations that detect and terminate problematic media processing threads before they can cause system instability. Additionally, implementing network-level filtering to block suspicious media file types and conducting regular security assessments of media processing components can help reduce the attack surface. The vulnerability highlights the importance of robust exception handling in mobile operating system components and the critical need for proper resource management in multimedia frameworks to prevent resource exhaustion attacks that can lead to complete system compromise.