CVE-2015-5261 in SPICE
Summary
by MITRE
Heap-based buffer overflow in SPICE before 0.12.6 allows guest OS users to read and write to arbitrary memory locations on the host via guest QXL commands related to surface creation.
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Analysis
by VulDB Data Team • 08/23/2022
The vulnerability identified as CVE-2015-5261 represents a critical heap-based buffer overflow in the SPICE (Simple Protocol for Independent Computing Environments) virtualization component that affects versions prior to 0.12.6. This flaw exists within the QXL graphics driver implementation that handles surface creation operations, creating a significant security risk for virtualized environments where guest operating systems interact with host systems through SPICE protocols.
The technical implementation of this vulnerability stems from inadequate bounds checking during the processing of QXL commands related to surface creation. When a guest OS user submits malicious QXL commands through the SPICE interface, the host system fails to properly validate the size and boundaries of memory allocations, leading to a heap-based buffer overflow condition. This overflow allows an attacker to manipulate heap memory structures and potentially execute arbitrary code with the privileges of the host system process running the SPICE server.
The operational impact of this vulnerability extends beyond simple memory corruption, as it enables a guest operating system user to gain unauthorized access to arbitrary memory locations on the host system. This capability allows for both read and write operations against sensitive host memory regions, potentially enabling privilege escalation, data exfiltration, or system compromise. The vulnerability is particularly dangerous in virtualized environments where multiple guest operating systems share the same host infrastructure, as it can be exploited to break out of virtual machine isolation boundaries.
This vulnerability maps to CWE-121 Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap memory allocations where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack pattern aligns with ATT&CK technique T1055.001 Process Injection: Dynamic-link Library Injection, as the overflow can be leveraged to inject malicious code into host processes. Additionally, this vulnerability demonstrates characteristics of T1074 Data Staging, as attackers can use the memory read/write capabilities to stage malicious payloads or extract sensitive information from host memory.
Mitigation strategies for CVE-2015-5261 include immediate patching of SPICE components to version 0.12.6 or later, which contains proper bounds checking and memory validation for QXL command processing. Organizations should also implement network segmentation to limit access to SPICE interfaces, particularly in multi-tenant environments where guest isolation is critical. Additional defensive measures include monitoring for unusual QXL command patterns, implementing strict access controls for SPICE connections, and conducting regular security assessments of virtualization infrastructure to identify potential exploitation vectors. System administrators should also consider implementing host-based intrusion detection systems that can monitor for suspicious memory access patterns indicative of buffer overflow exploitation attempts.