CVE-2014-4971 in Windows
Summary
by MITRE
Microsoft Windows XP SP3 does not validate addresses in certain IRP handler routines, which allows local users to write data to arbitrary memory locations, and consequently gain privileges, via a crafted address in an IOCTL call, related to (1) the MQAC.sys driver in the MQ Access Control subsystem and (2) the BthPan.sys driver in the Bluetooth Personal Area Networking subsystem.
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Analysis
by VulDB Data Team • 12/15/2024
This vulnerability exists in Microsoft Windows XP Service Pack 3 and represents a critical privilege escalation flaw affecting two distinct kernel drivers. The issue stems from inadequate input validation within IRP (I/O Request Packet) handler routines that process IOCTL (Input/Output Control) requests. Attackers can exploit this weakness by crafting malicious IOCTL calls that contain specially formatted addresses, bypassing normal memory protection mechanisms and enabling arbitrary code execution in kernel space. The vulnerability specifically affects the MQAC.sys driver responsible for Message Queuing Access Control and the BthPan.sys driver managing Bluetooth Personal Area Networking functionality, both of which handle privileged system operations without proper address validation. This flaw falls under CWE-787: "Out-of-bounds Write" and CWE-121: "Stack-based Buffer Overflow" categories, representing classic kernel-mode buffer overflow conditions that can be leveraged for privilege escalation.
The operational impact of this vulnerability is severe as local attackers with standard user privileges can escalate their access to SYSTEM level privileges, effectively compromising the entire system. The exploitation process involves crafting malicious IOCTL requests that target specific memory locations within the kernel address space, allowing attackers to write data to arbitrary memory addresses through the vulnerable IRP handler routines. This type of attack directly maps to ATT&CK technique T1068: "Exploitation for Privilege Escalation" and T1059: "Command and Scripting Interpreter" where attackers can execute malicious code with elevated privileges. The vulnerability is particularly dangerous because it affects widely deployed Windows XP systems, which were already vulnerable to numerous other exploits due to their end-of-life status, making the attack surface even more extensive.
Mitigation strategies for this vulnerability require immediate patching of the affected systems through Microsoft security updates, as the original vulnerability was addressed through proper input validation in the kernel drivers. Organizations should implement comprehensive endpoint protection solutions that monitor for suspicious IOCTL activity and memory access patterns, particularly focusing on the MQAC.sys and BthPan.sys drivers. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs, while regular security audits should verify that no unauthorized modifications exist in the affected driver files. The vulnerability demonstrates the critical importance of proper kernel-mode input validation and memory management practices, aligning with security frameworks such as the OWASP Top 10 for Server Side Security and NIST SP 800-155 guidelines for secure coding practices in operating system development. System administrators should also consider implementing additional monitoring controls that can detect anomalous behavior in kernel-level drivers and establish incident response procedures specifically tailored for privilege escalation attacks targeting legacy operating systems.