CVE-2016-2150 in SPICE
Summary
by MITRE
SPICE allows local guest OS users to read from or write to arbitrary host memory locations via crafted primary surface parameters, a similar issue to CVE-2015-5261.
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Analysis
by VulDB Data Team • 08/23/2022
The vulnerability identified as CVE-2016-2150 affects the SPICE (Simple Protocol for Independent Computing Environment) virtualization protocol implementation, specifically targeting the guest operating system's ability to interact with host memory through crafted surface parameters. This represents a critical privilege escalation and information disclosure flaw that undermines the fundamental security boundaries between virtualized guest environments and their underlying host systems. The issue stems from insufficient input validation within the SPICE protocol's primary surface handling mechanisms, allowing malicious guest users to manipulate memory access parameters beyond their intended scope.
The technical flaw manifests when local guest operating system users exploit improperly validated surface parameter values to perform unauthorized memory operations against the host system. This vulnerability operates through the SPICE protocol's graphics handling subsystem where guest VMs can specify parameters for primary surface rendering. When these parameters are not adequately sanitized, attackers can manipulate memory addresses to read arbitrary host memory locations or write data to unauthorized memory regions. The vulnerability shares similarities with CVE-2015-5261, indicating a pattern of insufficient input validation within the SPICE protocol's memory management components. This flaw specifically targets the graphics subsystem's memory handling capabilities and represents a classic case of buffer overflow or memory corruption vulnerability within virtualization software.
The operational impact of CVE-2016-2150 is severe and multifaceted, as it enables local privilege escalation within virtualized environments and potential information disclosure from host memory. Attackers with access to a guest operating system can leverage this vulnerability to read sensitive host memory contents, potentially accessing credentials, encryption keys, or other confidential data stored in host memory. The vulnerability also allows for arbitrary write operations, which could enable attackers to modify host system memory, potentially leading to complete host compromise or denial of service conditions. This represents a significant threat to virtualization security architectures where guest isolation is assumed to be maintained, as the vulnerability effectively breaks down the security boundary between guest and host environments.
Mitigation strategies for CVE-2016-2150 should focus on implementing robust input validation and parameter sanitization within SPICE protocol implementations. Organizations should immediately apply patches provided by virtualization platform vendors such as Red Hat, QEMU, and other affected software providers. The vulnerability aligns with CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write, both of which are fundamental memory safety issues that require proper bounds checking and input validation. Additionally, system administrators should consider implementing network segmentation and access controls to limit guest user privileges and reduce the attack surface. The ATT&CK framework categorizes this vulnerability under T1059: Command and Scripting Interpreter and T1068: Exploitation for Privilege Escalation, indicating that attackers may use this vulnerability to escalate privileges and maintain persistence within virtualized environments. Regular security assessments and monitoring of virtualization environments should be implemented to detect potential exploitation attempts and ensure that all systems remain patched against known vulnerabilities.