CVE-2000-0276 in BeOS
Summary
by MITRE
BeOS 4.5 and 5.0 allow local users to cause a denial of service via malformed direct system calls using interrupt 37.
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Analysis
by VulDB Data Team • 06/20/2024
The vulnerability described in CVE-2000-0276 represents a critical denial of service flaw affecting BeOS versions 4.5 and 5.0 operating systems. This vulnerability specifically targets the kernel-level handling of direct system calls, which are mechanisms that allow user-space applications to directly invoke kernel functions without going through the standard system call interface. The exploit leverages interrupt 37, a specific hardware interrupt vector that is typically reserved for debugging purposes in operating systems. When malformed direct system calls are executed through this interrupt, the system fails to properly validate input parameters, leading to system instability and eventual crash.
The technical nature of this vulnerability stems from inadequate input validation within the kernel's direct system call handler. Direct system calls in BeOS are designed to provide high-performance access to kernel functionality, but the implementation lacks proper bounds checking and parameter validation for interrupt 37. This allows malicious local users to craft specially formatted system call arguments that trigger unexpected behavior in the kernel's interrupt handling code. The flaw operates at the kernel level, making it particularly dangerous as it can compromise the entire operating system's stability and availability. According to CWE classification, this vulnerability maps to CWE-129, which addresses insufficient input validation, and CWE-131, which covers incorrect calculation of buffer or data sizes. The vulnerability's exploitation does not require elevated privileges since it targets local user access, making it particularly concerning for systems where local users might have malicious intent.
The operational impact of CVE-2000-0276 extends beyond simple system crashes, potentially disrupting critical services and applications running on affected BeOS systems. Local users who exploit this vulnerability can effectively render the entire operating system unusable, forcing administrators to perform manual system restarts and potentially leading to data loss if systems are not properly backed up. The vulnerability's nature as a denial of service attack means that even a single malicious user can compromise system availability, making it a significant concern for multi-user environments. From an ATT&CK framework perspective, this vulnerability aligns with techniques categorized under privilege escalation and denial of service, specifically targeting the system's kernel integrity and stability. The exploit's reliance on interrupt 37 suggests that the vulnerability may also be relevant to debugging and reverse engineering activities, potentially exposing system internals to attackers who understand low-level system operations.
Mitigation strategies for this vulnerability should focus on both immediate system hardening and long-term architectural improvements. System administrators should implement strict access controls to limit local user privileges and monitor for unusual system call patterns that might indicate exploitation attempts. The most effective immediate solution involves applying vendor patches or upgrading to newer versions of BeOS that have corrected the input validation issues in the direct system call handler. Additionally, implementing kernel debugging features and system call monitoring can help detect and prevent exploitation attempts. The vulnerability highlights the importance of robust input validation in kernel code and demonstrates how seemingly minor implementation flaws can lead to catastrophic system failures. Organizations should also consider implementing intrusion detection systems that can identify abnormal patterns of direct system calls and interrupt usage, providing early warning of potential exploitation attempts. Given the age of the affected systems, organizations should evaluate migrating to modern operating systems that have better security practices and more mature vulnerability management processes.