CVE-2017-11092 in Android
Summary
by MITRE
In android for MSM, Firefox OS for MSM, QRD Android, with all Android releases from CAF using the Linux kernel, in the KGSL driver function kgsl_ioctl_gpu_command, a Use After Free condition can potentially occur.
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Analysis
by VulDB Data Team • 12/07/2019
The vulnerability identified as CVE-2017-11092 represents a critical use after free condition within the KGSL (Kernel Graphics Subsystem Library) driver component of Android-based systems. This flaw exists in Qualcomm-based devices that utilize the Linux kernel and affects multiple Android releases through the Code Aurora Forum. The vulnerability specifically manifests in the kgsl_ioctl_gpu_command function, which handles GPU command processing within the kernel space. The issue arises from improper memory management where freed memory locations are accessed after being deallocated, creating potential avenues for arbitrary code execution or system instability.
This vulnerability falls under CWE-416, which classifies use after free conditions as a fundamental memory safety issue. The flaw demonstrates a classic kernel-level memory corruption vulnerability that can be exploited by malicious actors to gain elevated privileges within the system. The KGSL driver serves as a crucial interface between GPU operations and the Linux kernel, making it a prime target for attackers seeking to compromise device security. When the kgsl_ioctl_gpu_command function processes GPU commands, it fails to properly validate memory references after deallocation, allowing for potential exploitation through carefully crafted inputs that trigger the use after free scenario.
The operational impact of CVE-2017-11092 extends beyond simple system crashes or instability. Attackers can leverage this vulnerability to execute arbitrary code with kernel-level privileges, potentially leading to complete system compromise. The vulnerability affects devices running various Android versions including those based on the Linux kernel from Code Aurora Forum, making it widespread across Qualcomm-powered smartphones and tablets. This flaw can be exploited through malicious applications or compromised system components that invoke the vulnerable ioctl interface, potentially enabling privilege escalation attacks that bypass standard security boundaries. The attack surface is particularly concerning given that many mobile devices rely on KGSL for graphics processing, making this vulnerability exploitable in numerous real-world scenarios.
Mitigation strategies for CVE-2017-11092 involve immediate patching of affected systems through security updates from device manufacturers and the Linux kernel maintainers. Organizations should implement comprehensive vulnerability management programs to ensure timely deployment of patches across all affected devices. The remediation process requires careful coordination with device vendors, as the vulnerability exists within the kernel driver level where patches may need to be coordinated with hardware-specific implementations. Additionally, system administrators should consider implementing runtime protections such as memory protection mechanisms and kernel hardening techniques to reduce the exploitation risk. According to ATT&CK framework, this vulnerability aligns with T1068, which covers 'Exploitation for Privilege Escalation', and T1059, which addresses 'Command and Scripting Interpreter' techniques that could be employed to execute malicious payloads once the initial compromise is achieved through this use after free condition.