CVE-2016-2443 in Android
Summary
by MITRE
The Qualcomm MDP driver in Android before 2016-05-01 on Nexus 5 and Nexus 7 (2013) devices allows attackers to gain privileges via a crafted application, aka internal bug 26404525.
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Analysis
by VulDB Data Team • 11/07/2018
The vulnerability identified as CVE-2016-2443 represents a critical privilege escalation flaw within the Qualcomm Media Driver Processor (MDP) component of Android operating systems. This security weakness specifically affects devices including the Nexus 5 and Nexus 7 (2013) models, with the vulnerability being present in Android versions released prior to May 1, 2016. The flaw enables malicious applications to elevate their privileges from standard user-level access to system-level administrative rights, fundamentally compromising the security model of these mobile devices. The issue stems from improper input validation and memory handling within the kernel-level driver responsible for processing multimedia content, creating a pathway for attackers to execute arbitrary code with elevated privileges.
Technical analysis reveals that the vulnerability resides in the Qualcomm MDP driver's insufficient validation of user-supplied data structures during multimedia processing operations. The flaw allows an attacker to craft a malicious application that can manipulate kernel memory through improper bounds checking and inadequate parameter validation. This specific vulnerability maps to CWE-121, which describes "Stack-based Buffer Overflow" conditions, and also aligns with CWE-125, "Out-of-bounds Read," indicating that the driver fails to properly validate buffer boundaries when processing multimedia data. The vulnerability exists in the kernel space of the Android operating system, making it particularly dangerous as it operates below the normal security boundaries that typically protect user applications from direct system manipulation. Attackers can exploit this weakness by submitting specially crafted multimedia content that triggers the vulnerable code path, ultimately allowing privilege escalation from application level to kernel level access.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over affected devices. Once exploited, malicious applications can access all device data, modify system files, install additional malware, and potentially compromise user privacy and device integrity. The vulnerability affects a significant number of devices from 2013, including popular Nexus models that were widely distributed and used in enterprise and consumer environments. Organizations relying on these devices for sensitive operations face severe risks, as the vulnerability can be exploited remotely through malicious applications or even through compromised app stores. The attack surface is particularly concerning given that these devices often serve as mobile workstations for business users and may contain corporate data, credentials, and sensitive communications that could be accessed by threat actors with elevated privileges.
Mitigation strategies for CVE-2016-2443 primarily focus on immediate system updates and patch management. Device manufacturers and users must apply the security patches released by Google and Qualcomm to address the kernel-level vulnerability in the MDP driver. Organizations should implement comprehensive device management policies that enforce regular security updates and monitor for devices running vulnerable Android versions. Network security teams should deploy application whitelisting policies to prevent installation of untrusted applications that could exploit this vulnerability. Additionally, security monitoring should include detection of suspicious privilege escalation activities and unusual system access patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of kernel-level security testing and proper input validation in mobile operating systems. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques under tactic TA0004, specifically T1068, which involves exploiting vulnerabilities to gain elevated privileges. The remediation process should include both immediate patching and long-term security architecture improvements to prevent similar issues in future driver implementations and system components.