CVE-2013-4534 in QEMU
Summary
by MITRE
Buffer overflow in hw/intc/openpic.c in QEMU before 1.7.2 allows remote attackers to cause a denial of service or possibly execute arbitrary code via vectors related to IRQDest elements.
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Analysis
by VulDB Data Team • 06/20/2021
The vulnerability identified as CVE-2013-4534 represents a critical buffer overflow flaw within the QEMU virtualization platform's interrupt controller implementation. This issue resides in the hw/intc/openpic.c file and affects QEMU versions prior to 1.7.2, making it a significant concern for virtualization environments where QEMU serves as the primary hypervisor. The vulnerability specifically targets the IRQDest elements processing within the OpenPIC (Open Programmable Interrupt Controller) implementation, which is fundamental to how virtual machines handle interrupt routing and processing. The flaw occurs when the system processes malformed or oversized IRQDest elements, leading to memory corruption that can be exploited by remote attackers.
The technical nature of this vulnerability stems from inadequate bounds checking within the OpenPIC interrupt controller code. When QEMU processes interrupt destination information, it fails to properly validate the size and structure of the IRQDest elements, allowing attackers to craft malicious input that exceeds the allocated buffer space. This buffer overflow condition can result in memory corruption that manifests as either a denial of service through system crashes or more critically, arbitrary code execution within the host system context. The vulnerability is particularly dangerous because it operates at the hypervisor level, meaning successful exploitation could potentially allow attackers to escape the virtual machine boundaries and compromise the host system. The flaw aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of unsafe memory handling in virtualization software.
The operational impact of CVE-2013-4534 extends far beyond simple service disruption, as it creates a pathway for privilege escalation and system compromise within virtualized environments. Attackers leveraging this vulnerability could potentially execute malicious code with the privileges of the QEMU process, which typically runs with elevated permissions on the host system. This makes the vulnerability particularly attractive to threat actors targeting virtualized infrastructure, as it provides a means to gain unauthorized access to underlying host resources. The remote exploitability aspect means that attackers need not have physical access to the system, making this vulnerability particularly dangerous in cloud computing environments where QEMU is commonly used for virtual machine hosting. Organizations running vulnerable QEMU versions face significant risk of data breaches, service interruptions, and potential complete system compromise, especially in environments where virtual machines are used for sensitive data processing.
Mitigation strategies for CVE-2013-4534 primarily focus on immediate version updates and system hardening measures. The most effective solution involves upgrading to QEMU version 1.7.2 or later, which includes patches addressing the buffer overflow conditions in the OpenPIC implementation. Organizations should also implement network segmentation and access controls to limit exposure to potential attackers, particularly in environments where virtual machines are accessible over untrusted networks. Additionally, monitoring systems should be deployed to detect unusual interrupt processing patterns or memory allocation behaviors that might indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date virtualization software and implementing robust security practices for hypervisor environments, as outlined in various cybersecurity frameworks including the MITRE ATT&CK framework's virtualization and container techniques. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other virtualization components, as this vulnerability represents a broader class of memory corruption flaws that can affect virtualization platforms.