CVE-2024-47017 in Android
Summary
by MITRE • 10/25/2024
In ufshc_scsi_cmd of ufs.c, there is a possible stack variable use after free due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 10/25/2024
The vulnerability identified as CVE-2024-47017 represents a critical use-after-free condition within the ufshc_scsi_cmd function of the ufs.c driver file, which forms part of the Universal Flash Storage subsystem in Linux kernel implementations. This flaw exists in the handling of SCSI commands within the UFS host controller driver where a stack variable is accessed after it has been freed, creating a potential pathway for privilege escalation. The vulnerability resides in the kernel's device driver layer specifically targeting the Universal Flash Storage protocol implementation that manages storage devices connected via UFS interfaces.
The technical root cause of this vulnerability stems from improper memory management within the SCSI command processing function where a local stack variable is freed from memory but subsequently accessed during the execution flow. This memory corruption pattern creates an opportunity for attackers to manipulate the execution flow by overwriting the freed memory location with malicious data, potentially leading to arbitrary code execution. The flaw demonstrates characteristics consistent with CWE-416, which describes use-after-free vulnerabilities where memory is accessed after it has been freed, and aligns with ATT&CK technique T1068 which covers local privilege escalation through kernel vulnerabilities.
The operational impact of this vulnerability is severe as it enables local privilege escalation without requiring any additional execution privileges or user interaction for exploitation. This means that any user with access to the system can potentially leverage this vulnerability to gain elevated privileges, effectively bypassing standard security boundaries. The lack of user interaction requirements makes this particularly dangerous as it can be exploited automatically without the need for social engineering or user deception tactics. The vulnerability affects systems running Linux kernels that implement the UFS storage subsystem, particularly those utilizing UFS host controllers for storage operations.
Mitigation strategies for CVE-2024-47017 should prioritize immediate kernel updates from the vendor to address the memory management flaw in the ufs.c driver file. System administrators should also implement monitoring for unusual privilege escalation attempts and ensure that only necessary users have access to systems with UFS storage capabilities. The vulnerability requires careful patch management as kernel updates can impact system stability and require thorough testing in production environments. Additionally, implementing runtime protections such as stack canaries and memory protection mechanisms can help detect and prevent exploitation attempts, though the most effective solution remains the official kernel patch addressing the specific use-after-free condition in the UFS driver implementation.