CVE-2023-3781 in Android
Summary
by MITRE • 10/25/2023
there is a possible use-after-free write due to improper locking. 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 • 10/31/2023
The vulnerability identified as CVE-2023-3781 represents a critical use-after-free condition that emerges from inadequate locking mechanisms within the affected system. This flaw manifests as a memory safety issue where freed memory locations are accessed or written to after their original allocation has been released. The improper locking allows concurrent access to shared resources without proper synchronization, creating a race condition that can be exploited to manipulate memory state. The vulnerability resides at a fundamental level in the kernel or system-level component where resource management and access control should be rigorously enforced.
The technical implementation of this vulnerability involves a scenario where multiple execution paths can access the same memory object simultaneously without proper mutual exclusion. When a resource is freed and subsequently reallocated or accessed by another thread or process, the lack of adequate locking mechanisms means that the original freed memory can be overwritten with malicious data. This creates a potential attack surface where an attacker can manipulate the memory layout to achieve arbitrary code execution. The flaw operates under the CWE-416 category of use-after-free conditions, specifically manifesting as a write operation on freed memory rather than a read operation. This particular variant is classified under the broader ATT&CK technique T1068 which covers local privilege escalation through system-level vulnerabilities.
The operational impact of CVE-2023-3781 is severe as it enables local privilege escalation without requiring any additional execution privileges or user interaction. An attacker who already has access to a low-privilege account can leverage this vulnerability to gain elevated system privileges, effectively bypassing access controls and potentially compromising the entire system. The lack of user interaction requirement makes this vulnerability particularly dangerous as it can be exploited automatically without any human intervention. The exploitation process typically involves carefully crafting memory operations that force the system to free memory and then overwrite it with controlled data, ultimately redirecting execution flow to malicious code. This vulnerability affects the integrity and confidentiality of the system by allowing unauthorized elevation of privileges, potentially leading to complete system compromise.
Mitigation strategies for CVE-2023-3781 should focus on implementing proper locking mechanisms and memory management protocols throughout the affected system components. The primary defense involves strengthening synchronization primitives to ensure that shared resources are properly protected from concurrent access. System administrators should apply the latest security patches and updates provided by the vendor to address the root cause of the vulnerability. Additional protective measures include implementing kernel hardening techniques such as stack canaries, address space layout randomization, and control flow integrity checks. Monitoring for suspicious memory access patterns and implementing robust access control policies can help detect exploitation attempts. Organizations should also consider deploying intrusion detection systems that can identify anomalous behavior indicative of privilege escalation attempts. The vulnerability underscores the importance of proper resource management practices and adherence to secure coding guidelines, particularly in kernel-level code where race conditions can have catastrophic consequences. Regular security assessments and code reviews focused on synchronization mechanisms are essential for preventing similar vulnerabilities from emerging in the future.