CVE-2008-3838 in OpenSolaris
Summary
by MITRE
Unspecified vulnerability in the NFS Remote Procedure Calls (RPC) zones implementation in Sun Solaris 10 and OpenSolaris before snv_88 allows local administrators of non-global zones to read and modify NFS traffic for arbitrary non-global zones, possibly leading to file modifications or a denial of service.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability described in CVE-2008-3838 represents a critical security flaw within the Network File System (NFS) implementation of Sun Solaris 10 and OpenSolaris operating systems. This issue specifically affects the Remote Procedure Call (RPC) zones functionality, which is designed to enable communication between different zones within a Solaris system. The vulnerability exists in the non-global zone implementation where local administrators can potentially exploit insufficient access controls to intercept and manipulate NFS traffic destined for other non-global zones. The flaw fundamentally undermines the isolation principles that zones are meant to provide, creating a significant attack surface for privilege escalation and data integrity compromise.
The technical nature of this vulnerability stems from inadequate boundary enforcement within the RPC zones implementation. When local administrators operate within non-global zones, they should be restricted from accessing or modifying network traffic originating from or destined to other zones. However, the flaw allows these administrators to bypass such restrictions, enabling them to read and modify NFS traffic data streams. This capability essentially provides a mechanism for arbitrary access to network resources that should remain isolated. The vulnerability manifests as a lack of proper authentication and authorization checks during NFS RPC communications between zones, creating an unintended pathway for privilege escalation. The underlying issue is particularly concerning because it operates at the kernel level within the zone isolation framework, making it difficult to detect and remediate without system-level intervention.
The operational impact of this vulnerability extends beyond simple data access, as it can lead to both data modification and service disruption. Local administrators exploiting this vulnerability could potentially modify files in other zones, corrupting data integrity and potentially causing system instability. The ability to read NFS traffic also provides attackers with access to sensitive information that may be transmitted between zones, including authentication credentials, proprietary data, or system configuration details. This vulnerability essentially enables a form of cross-zone privilege escalation that could allow attackers to gain unauthorized access to resources they should not normally be able to access. The potential for denial of service exists as well, since manipulation of NFS traffic could cause system crashes or resource exhaustion in target zones. From a compliance perspective, this vulnerability violates fundamental security principles of information assurance and could result in regulatory violations for organizations using affected systems.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. The primary solution involves applying the relevant security patches provided by Oracle for Solaris 10 and OpenSolaris systems, which typically include enhanced access controls and improved zone isolation mechanisms. Organizations should also implement network segmentation strategies to limit the scope of potential attacks, ensuring that NFS traffic between zones is properly monitored and controlled. From a monitoring perspective, implementing comprehensive network traffic analysis can help detect unusual NFS traffic patterns that may indicate exploitation attempts. The vulnerability aligns with several common attack patterns documented in the ATT&CK framework, particularly those related to privilege escalation and credential access. Security professionals should also consider implementing principle of least privilege controls, ensuring that local administrators have minimal necessary access rights within non-global zones. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar issues within zone-based architectures, as this vulnerability represents a broader class of problems related to container and zone isolation mechanisms. The affected systems should be configured to disable unnecessary NFS services and RPC functionality that are not required for their specific operational requirements, reducing the overall attack surface and potential impact of such vulnerabilities.