CVE-2023-4262 in Zephyr
Summary
by MITRE • 09/27/2023
Possible buffer overflow in Zephyr mgmt subsystem when asserts are disabled
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Analysis
by VulDB Data Team • 06/21/2026
The vulnerability involves a potential buffer overflow within the Zephyr management subsystem that occurs specifically when assertion checks are disabled during system operation. This flaw represents a critical security concern as it exploits the difference in behavior between debug and production environments where assertions are typically disabled to optimize performance. The management subsystem in Zephyr is responsible for handling various administrative functions including device configuration, firmware updates, and system monitoring operations. When assertions are disabled, the code path that would normally prevent unsafe memory operations is bypassed, creating an opportunity for malicious actors to manipulate input data and cause buffer overflow conditions.
The technical implementation of this vulnerability stems from improper input validation within the management subsystem's data processing routines. Without assertion checks to validate buffer boundaries and input parameters, the code fails to properly sanitize incoming data before copying it into fixed-size buffers. This creates a classic buffer overflow scenario where attacker-controlled data can overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability is particularly concerning because it only manifests when the system operates in production mode with assertions disabled, making it difficult to detect during normal development and testing phases.
The operational impact of this vulnerability extends beyond simple memory corruption as it can enable sophisticated attack vectors that leverage the buffer overflow to gain unauthorized system access. Attackers could potentially craft malicious management commands that trigger the overflow condition, allowing them to overwrite critical system structures or execute arbitrary code within the context of the management subsystem. This represents a significant threat to embedded systems security where the management subsystem often has elevated privileges and direct access to core system resources. The vulnerability affects any Zephyr-based system that operates with assertions disabled in production environments, which is common practice for performance optimization in resource-constrained devices.
Mitigation strategies should focus on implementing robust input validation and bounds checking regardless of assertion status. The recommended approach includes adding explicit buffer size validation before memory operations, implementing proper input sanitization routines, and ensuring that all management subsystem functions validate input parameters independently of assertion states. Security practitioners should also consider enabling runtime bounds checking mechanisms or using memory-safe programming practices that prevent buffer overflows even when assertions are disabled. Organizations deploying Zephyr-based systems should conduct thorough security assessments to identify all code paths within the management subsystem and ensure that proper defensive programming techniques are implemented. This vulnerability aligns with CWE-121 buffer overflow conditions and maps to attack techniques in the MITRE ATT&CK framework under privilege escalation and code injection categories. The issue demonstrates the importance of maintaining security controls across all operational modes of embedded systems, as the transition from development to production environments should not introduce security regressions.