CVE-2023-6881 in Zephyr
Summary
by MITRE • 02/29/2024
Possible buffer overflow in is_mount_point
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Analysis
by VulDB Data Team • 05/14/2026
A potential buffer overflow vulnerability exists within the is_mount_point function, representing a critical security weakness that could allow attackers to execute arbitrary code or cause system instability. This type of vulnerability typically arises when the function fails to properly validate input lengths before copying data into fixed-size buffers, creating opportunities for attackers to overwrite adjacent memory regions. The flaw manifests when the function processes mount point paths without adequate bounds checking, potentially allowing malicious input to exceed allocated buffer boundaries. Such buffer overflows fall under the common weakness enumeration CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking permits data to overwrite adjacent memory locations. The operational impact of this vulnerability extends beyond simple denial of service scenarios, as attackers could leverage the overflow to inject and execute malicious code within the context of the affected application or system process. When exploited, this vulnerability could enable privilege escalation attacks, allowing unprivileged users to gain elevated system privileges, or facilitate remote code execution if the vulnerable function operates in network-facing contexts. The attack surface becomes particularly concerning when considering that mount point operations are fundamental system functions often invoked during system initialization, file operations, or administrative tasks. Security frameworks such as the ATT&CK matrix categorize this type of vulnerability under the technique T1068, which involves the exploitation of elevated privileges through local system vulnerabilities. The vulnerability's exploitation typically requires attackers to craft malicious input that precisely overflows the buffer, often through carefully constructed mount point paths or symbolic link manipulations. The risk assessment indicates that this vulnerability presents a high-severity threat to system integrity and availability, particularly in environments where the affected system processes untrusted mount point data or where users can influence mount point creation. Organizations should prioritize patching this vulnerability through proper bounds checking implementations that validate input lengths before buffer operations, ensuring that all string operations within the is_mount_point function include appropriate safeguards against buffer overflows. The mitigation strategy should encompass code reviews to identify similar patterns throughout the codebase, implementation of stack canaries or address space layout randomization, and comprehensive testing to validate that input validation prevents buffer overflow conditions. Additionally, system administrators should monitor for suspicious mount point activities and implement network segmentation to limit potential exploitation vectors. The vulnerability's classification as a buffer overflow necessitates immediate attention from security teams, as the potential for remote code execution or privilege escalation makes it a prime target for advanced persistent threat actors. Proper input sanitization and memory management practices should be enforced across all system components that handle mount point data to prevent similar vulnerabilities from emerging in other functions or modules.