CVE-2016-3903 in Android
Summary
by MITRE
drivers/media/platform/msm/camera_v2/sensor/csid/msm_csid.c in the Qualcomm camera driver in Android before 2016-10-05 on Nexus 5, Nexus 5X, Nexus 6, Nexus 6P, and Android One devices allows attackers to gain privileges via a crafted application, aka Android internal bug 29513227 and Qualcomm internal bug CR 1040857.
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Analysis
by VulDB Data Team • 09/22/2022
The vulnerability identified as CVE-2016-3903 represents a critical privilege escalation flaw within the Qualcomm camera driver component of Android operating systems. This issue specifically affects devices running Android versions prior to 2016-10-05 including Nexus 5, Nexus 5X, Nexus 6, Nexus 6P, and Android One models. The vulnerability stems from improper input validation and memory management within the msm_csid.c driver file which handles camera sensor interface operations. The flaw enables malicious applications to exploit kernel-level code execution paths that should remain restricted to legitimate system processes.
The technical implementation of this vulnerability involves a buffer overflow condition within the camera sensor interface driver that occurs when processing malformed sensor data structures. Attackers can craft specially designed applications that trigger this overflow by sending malformed data to the camera subsystem through the Qualcomm MSM camera driver. This particular flaw falls under the Common Weakness Enumeration category of CWE-121, which describes "Stack-based Buffer Overflow" conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability is particularly dangerous because it operates at kernel level where the attacker gains elevated privileges and can execute arbitrary code with system-level permissions.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise capabilities. Once exploited, the attacker can bypass Android's security model and gain root access to the device, enabling them to modify system files, install malicious applications, access sensitive user data, and potentially establish persistent backdoors. This vulnerability directly maps to ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation" and T1543, covering "Create or Modify System Process" as attackers can leverage this flaw to modify critical system processes. The affected devices represent a significant portion of the Android ecosystem from 2014-2016, making this vulnerability particularly impactful across multiple generations of mobile devices.
Mitigation strategies for this vulnerability primarily focus on immediate system updates and patches provided by Google and device manufacturers. Users should ensure their devices receive the October 2016 security update that addressed this specific issue. Device manufacturers should implement proper input validation mechanisms within camera driver components and conduct thorough code reviews for memory management operations. Additionally, implementing kernel-level protections such as stack canaries, address space layout randomization, and kernel address space protection can significantly reduce the exploitability of similar buffer overflow conditions. Network administrators should monitor for suspicious application behavior that might indicate exploitation attempts and maintain updated threat intelligence feeds for mobile security threats. The vulnerability serves as a critical reminder of the importance of secure coding practices in kernel-level drivers and the necessity of regular security updates for mobile device operating systems.