CVE-2015-5260 in SPICE
Summary
by MITRE
Heap-based buffer overflow in SPICE before 0.12.6 allows guest OS users to cause a denial of service (heap-based memory corruption and QEMU-KVM crash) or possibly execute arbitrary code on the host via QXL commands related to the surface_id parameter.
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Analysis
by VulDB Data Team • 08/23/2022
The vulnerability identified as CVE-2015-5260 represents a critical heap-based buffer overflow within the SPICE (Simple Protocol for Independent Computing Environments) graphics subsystem that affected versions prior to 0.12.6. This flaw exists in the QXL (QEMU Xen Guest Loader) implementation responsible for handling graphics operations between the guest operating system and the host virtual machine. The vulnerability specifically manifests when processing QXL commands that contain the surface_id parameter, which is used to identify graphics surfaces within the virtualized graphics environment. The heap-based nature of this buffer overflow indicates that the vulnerability occurs in dynamically allocated memory regions, making it particularly dangerous as it can lead to memory corruption that affects the stability and security of the entire virtualization stack.
The technical exploitation of this vulnerability occurs through carefully crafted QXL commands sent from a compromised guest operating system to the host system running QEMU-KVM virtualization. When the SPICE server processes these malformed commands containing oversized surface_id values, it fails to properly validate the input parameters before copying data into heap-allocated buffers. This validation failure results in a buffer overflow condition where the amount of data written exceeds the allocated buffer size, causing adjacent memory locations to be overwritten. The attack vector is particularly insidious because it operates entirely within the guest-to-host communication channel, allowing malicious guest users to potentially escalate their privileges and execute arbitrary code on the host system or cause the virtual machine to crash, thereby enabling denial of service attacks.
The operational impact of CVE-2015-5260 extends beyond simple denial of service scenarios to encompass potential privilege escalation and arbitrary code execution on the host system. This vulnerability directly violates the fundamental security principle of virtualization isolation, where guest operating systems should not be able to directly compromise the host environment. The vulnerability maps to CWE-121, heap-based buffer overflow, and aligns with ATT&CK techniques involving privilege escalation and code injection through communication channel manipulation. Attackers can leverage this flaw to gain unauthorized access to host resources, potentially leading to complete system compromise of the virtualization infrastructure. The impact is particularly severe in multi-tenant environments where multiple guest operating systems share the same host, as a single compromised guest could potentially affect all other virtual machines running on the same physical hardware.
Mitigation strategies for CVE-2015-5260 require immediate patching of all affected SPICE components to version 0.12.6 or later, which includes proper input validation and bounds checking for the surface_id parameter in QXL commands. Organizations should implement network segmentation to limit guest-to-host communication where possible and deploy intrusion detection systems that monitor for anomalous QXL command patterns. The vulnerability demonstrates the importance of input validation in virtualization protocols and highlights the need for comprehensive security testing of communication channels between guest and host systems. Additionally, administrators should consider implementing virtual machine monitoring solutions that can detect and respond to unusual memory allocation patterns that may indicate buffer overflow exploitation attempts, as this vulnerability represents a classic example of how guest operating system compromises can translate into host-level security breaches through poorly validated input processing in virtualization stacks.