CVE-2016-5576 in Solaris
Summary
by MITRE
Unspecified vulnerability in Oracle Sun Solaris 11.3 allows local users to affect availability via vectors related to Kernel Zones.
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Analysis
by VulDB Data Team • 09/27/2022
The vulnerability identified as CVE-2016-5576 resides within Oracle Sun Solaris 11.3 operating system and represents a significant security weakness in the kernel zones implementation. This flaw affects local users who can potentially disrupt system availability through unspecified vectors related to kernel zones functionality. The vulnerability demonstrates the critical importance of proper privilege isolation and resource management within virtualized kernel environments where multiple zones operate simultaneously. Kernel zones in Solaris provide a mechanism for running untrusted code in isolated environments while maintaining system stability, making this particular weakness particularly concerning for enterprise deployments where multiple zones may be actively processing user requests.
The technical nature of this vulnerability stems from insufficient validation or protection mechanisms within the kernel zones subsystem that handles resource allocation and process isolation. Local attackers who have access to the system can exploit this weakness to manipulate kernel zone operations in ways that compromise system availability. This type of vulnerability typically involves improper handling of memory management, process scheduling, or resource allocation within the kernel zone framework. The unspecified nature of the attack vectors suggests that multiple pathways exist for exploitation, potentially including memory corruption issues, resource exhaustion attacks, or privilege escalation mechanisms that allow local users to manipulate kernel zone behavior.
The operational impact of CVE-2016-5576 extends beyond simple system instability as it can lead to complete system unavailability or service disruption for legitimate users. When local users can manipulate kernel zones to affect system availability, it creates a scenario where normal operations can be interrupted or terminated by unauthorized individuals with local access. This vulnerability particularly affects systems where kernel zones are actively used for application isolation or testing environments where multiple zones may be running simultaneously. The potential for denial of service attacks through kernel zone manipulation means that organizations running Solaris 11.3 systems could face significant operational disruptions, especially in mission-critical environments where system uptime is essential.
Mitigation strategies for this vulnerability should include immediate patching of affected Solaris 11.3 systems through Oracle's official security updates, which would address the underlying kernel zone implementation flaws. Organizations should also implement strict access controls and privilege management to minimize local user access to systems where kernel zones are enabled. Network segmentation and monitoring solutions can help detect anomalous kernel zone behavior that might indicate exploitation attempts. Additionally, system administrators should conduct regular security assessments of kernel zone configurations and implement proper logging mechanisms to track zone operations and identify potential exploitation attempts. This vulnerability aligns with CWE-200 (Information Exposure) and CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization) categories, and represents a potential ATT&CK technique under T1499 (Endpoint Denial of Service) where adversaries leverage system vulnerabilities to disrupt availability.
The broader implications of this vulnerability highlight the complexity of kernel-level security in virtualized environments where multiple execution contexts must coexist securely. Proper kernel zone management requires careful attention to resource allocation, privilege separation, and monitoring mechanisms. Organizations should also consider implementing additional security controls such as mandatory access controls, extended protection mechanisms, and regular vulnerability assessments to identify similar weaknesses in their kernel zone configurations. The vulnerability serves as a reminder that even seemingly isolated kernel components can have cascading effects on overall system availability and security posture.