CVE-2017-7370 in Android
Summary
by MITRE
In all Android releases from CAF using the Linux kernel, a race condition exists in a video driver potentially leading to a use-after-free condition.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2017-7370 represents a critical race condition flaw within the video driver component of Android systems built on the Linux kernel from Code Aurora Forum. This issue affects all Android releases utilizing the Linux kernel from CAF, creating a widespread security concern across numerous mobile devices and embedded systems. The race condition manifests in the video driver subsystem where concurrent access patterns create opportunities for improper resource management. The flaw specifically enables a use-after-free condition that occurs when memory allocated to video driver components is accessed after being freed, potentially leading to unpredictable behavior and system instability.
The technical implementation of this vulnerability stems from improper synchronization mechanisms within the video driver's memory management routines. When multiple threads or processes attempt to access video driver resources simultaneously, the lack of proper locking mechanisms allows for timing windows where memory deallocation can occur before all references to that memory are resolved. This race condition creates a window of opportunity for malicious actors to manipulate the system state, potentially leading to privilege escalation or arbitrary code execution. The vulnerability is classified under CWE-362, which specifically addresses race conditions in concurrent programming, and aligns with ATT&CK technique T1068, which covers exploit for privilege escalation through system-level vulnerabilities.
The operational impact of CVE-2017-7370 extends beyond simple system instability to potentially enable full system compromise. When exploited, this vulnerability can allow attackers to execute arbitrary code with kernel-level privileges, effectively bypassing Android's security model and enabling complete system control. The use-after-free condition can be leveraged to overwrite critical kernel memory structures, leading to denial of service, data corruption, or persistent backdoor access. Mobile device users face particular risk as this vulnerability affects the core multimedia subsystem, potentially enabling attackers to manipulate video processing functions while maintaining persistent access to device resources.
Mitigation strategies for CVE-2017-7370 require immediate patching of affected Android systems through official security updates from device manufacturers. Organizations should implement comprehensive vulnerability management programs that include regular security assessments and prompt deployment of patches across all affected devices. System administrators should monitor for exploitation attempts through network traffic analysis and endpoint detection systems. The fix typically involves implementing proper synchronization mechanisms and memory management protocols within the video driver code to prevent concurrent access issues. Additionally, device manufacturers should conduct thorough security testing of driver components and implement proper code review processes to identify similar race condition vulnerabilities before deployment. Security teams should also consider network-based detection measures that monitor for exploitation attempts targeting this specific vulnerability pattern.