CVE-2017-8380 in QEMU
Summary
by MITRE
Buffer overflow in the "megasas_mmio_write" function in Qemu 2.9.0 allows remote attackers to have unspecified impact via unknown vectors.
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Analysis
by VulDB Data Team • 12/16/2022
The vulnerability identified as CVE-2017-8380 represents a critical buffer overflow flaw within the QEMU virtualization platform version 2.9.0. This issue specifically affects the "megasas_mmio_write" function which handles memory-mapped I/O operations for MegaRAID storage controllers within virtual machine environments. The vulnerability exists in the hypervisor layer where QEMU emulates hardware components for virtual machines, creating a potential attack surface that could be exploited by remote adversaries.
The technical implementation of this buffer overflow occurs within the memory-mapped I/O write handler for MegaRAID storage controllers. When QEMU processes write operations to specific memory addresses that correspond to MegaRAID controller registers, the "megasas_mmio_write" function fails to properly validate input data lengths before copying data into fixed-size buffers. This lack of bounds checking creates an exploitable condition where malicious input can overwrite adjacent memory regions, potentially leading to arbitrary code execution or system instability. The vulnerability manifests during the processing of storage I/O operations within virtualized environments, particularly affecting systems that utilize MegaRAID storage controllers in their virtual machine configurations.
The operational impact of CVE-2017-8380 extends beyond simple denial of service scenarios, as it provides attackers with potential paths to escalate privileges within virtualized environments. Remote attackers who can influence memory-mapped I/O operations to affected QEMU instances may achieve arbitrary code execution with the privileges of the QEMU process, which typically runs with elevated system permissions. This vulnerability affects the integrity and availability of virtualized computing environments, potentially allowing attackers to compromise multiple virtual machines sharing the same hypervisor host. The unspecified impact mentioned in the CVE description suggests that exploitation could lead to various outcomes including complete system compromise, data exfiltration, or persistent backdoor installation within virtualized infrastructures.
Mitigation strategies for this vulnerability require immediate patching of QEMU installations to versions that contain the necessary buffer overflow protections and input validation fixes. Organizations should implement network segmentation to limit access to QEMU management interfaces and virtual machine consoles, reducing the attack surface for remote exploitation attempts. Security monitoring should focus on detecting anomalous memory-mapped I/O operations and unusual storage controller interactions within virtualized environments. The vulnerability aligns with CWE-121 which describes stack-based buffer overflow conditions, and may map to ATT&CK techniques involving privilege escalation and persistence within virtualized environments. System administrators should also consider implementing virtual machine isolation measures and regularly auditing QEMU configurations to prevent unauthorized modifications that could exacerbate the vulnerability's impact.