CVE-2016-2449 in Android
Summary
by MITRE
services/camera/libcameraservice/device3/Camera3Device.cpp in mediaserver in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-05-01 does not validate template IDs, which allows attackers to gain privileges via a crafted application, as demonstrated by obtaining Signature or SignatureOrSystem access, aka internal bug 27568958.
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2016-2449 represents a critical privilege escalation flaw within the Android media server component, specifically affecting camera service functionality across multiple Android versions. This issue resides in the Camera3Device.cpp file within the mediaserver process, which serves as a core system service responsible for managing camera hardware access and processing camera-related requests from applications. The vulnerability stems from insufficient validation of template IDs during camera device operations, creating a pathway for malicious applications to exploit the system and elevate their privileges beyond normal application boundaries.
The technical implementation of this vulnerability occurs within the camera service framework where template IDs are used to define camera configuration parameters and access controls. When the mediaserver process fails to properly validate these template IDs, attackers can craft malicious applications that manipulate these identifiers to bypass security checks. This validation failure allows unauthorized access to system-level permissions, specifically enabling the acquisition of Signature or SignatureOrSystem access levels that grant applications elevated privileges typically restricted to system-signed components. The flaw operates at the kernel level within the Android HAL (Hardware Abstraction Layer) interface, making it particularly dangerous as it can be exploited without requiring user interaction or physical access to the device.
The operational impact of CVE-2016-2449 extends beyond simple privilege escalation, as it fundamentally undermines the security model of Android's application sandboxing mechanism. Attackers leveraging this vulnerability can effectively bypass the normal security boundaries that separate user applications from system services, potentially enabling them to access sensitive device data, intercept camera feeds, or perform other malicious activities that would normally be restricted. This vulnerability is particularly concerning because it affects multiple Android versions simultaneously, including the widely deployed Android 4.x through 6.x releases, making it a significant threat to a large user base. The attack vector requires only a crafted application, meaning users could be compromised simply by installing what appears to be a legitimate app from the Google Play Store or other sources.
From a cybersecurity perspective, this vulnerability aligns with CWE-20 (Improper Input Validation) and represents a classic example of how insufficient validation in system-level components can lead to privilege escalation. The ATT&CK framework categorizes this as a privilege escalation technique, specifically falling under T1068 (Local Privilege Escalation) and potentially T1548.001 (Abuse Elevation Control Mechanism). The vulnerability demonstrates how Android's security model can be undermined through manipulation of hardware abstraction layer interfaces, where the camera service's trust model is compromised by inadequate input validation. Organizations and security teams should recognize this as a critical vulnerability requiring immediate attention, as it represents a fundamental weakness in Android's security architecture that can be exploited by malicious actors without requiring sophisticated attack techniques or specialized tools.
The mitigation strategy for CVE-2016-2449 requires immediate deployment of security patches provided by Google and device manufacturers, as well as comprehensive system monitoring to detect potential exploitation attempts. Organizations should implement application whitelisting policies to prevent installation of untrusted applications and conduct regular security audits of camera-related system services. Additionally, device administrators should ensure that all Android devices are updated to the latest security patches, as this vulnerability affects multiple versions and can be exploited across different Android releases. The fix implemented by Google involved strengthening template ID validation within the camera service framework, ensuring that all incoming template identifiers are properly verified before being processed, thereby closing the privilege escalation pathway that attackers could exploit to gain elevated system access.