CVE-2000-0463 in BeOS
Summary
by MITRE
BeOS 5.0 allows remote attackers to cause a denial of service via fragmented TCP packets.
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Analysis
by VulDB Data Team • 06/16/2024
The vulnerability described in CVE-2000-0463 represents a critical denial of service flaw affecting BeOS 5.0 operating system implementations. This issue manifests when the system receives fragmented tcp packets that trigger abnormal processing behavior leading to system instability and service disruption. The flaw specifically targets the network stack implementation within BeOS 5.0, where the operating system fails to properly handle fragmented packet reassembly processes. This vulnerability operates at the transport layer of the network protocol stack and demonstrates poor input validation and error handling mechanisms within the kernel networking components.
The technical root cause of this vulnerability stems from inadequate handling of TCP packet fragmentation within the BeOS 5.0 network stack. When the system receives fragmented packets that exceed normal processing parameters or contain malformed data structures, the kernel's packet reassembly routine fails to properly manage the fragmentation process. This leads to memory corruption or infinite loop conditions that ultimately result in system hang or complete system crash. The vulnerability falls under the category of improper handling of fragmented network traffic and can be classified as a CWE-129 weakness related to improper validation of input data. The flaw demonstrates insufficient bounds checking and lack of proper error recovery mechanisms in the network protocol implementation.
From an operational perspective, this vulnerability presents a significant threat to systems running BeOS 5.0 as remote attackers can exploit it to disrupt services without requiring authentication or elevated privileges. The denial of service impact means that legitimate users and services relying on the affected system may experience complete service interruption, potentially affecting business operations and network availability. Attackers can craft specific fragmented tcp packets that trigger the vulnerability, making this attack vector particularly dangerous as it requires minimal effort to execute. The vulnerability affects the availability aspect of the CIA triad and can be mapped to attack techniques described in the MITRE ATT&CK framework under the network denial of service category. Systems utilizing BeOS 5.0 for critical network services become particularly vulnerable to this type of exploitation.
The mitigation strategies for CVE-2000-0463 involve immediate system updates and patches from BeOS vendors, though given the age of this vulnerability, such patches may no longer be available for modern systems. Organizations should implement network segmentation and access controls to limit exposure to this vulnerability. Network administrators can deploy intrusion detection systems to monitor for suspicious fragmented packet patterns that may indicate exploitation attempts. The implementation of proper firewall rules to limit tcp packet fragmentation or to drop malformed packets can provide temporary protection. Additionally, system administrators should consider implementing network monitoring tools that can detect unusual traffic patterns associated with fragmented packet processing. Given the age of BeOS 5.0 and the limited support for this operating system, organizations should plan migration to supported platforms to eliminate exposure to this and similar legacy vulnerabilities. The vulnerability highlights the importance of robust network stack implementations and proper error handling in operating system design to prevent exploitation through malformed network traffic.