CVE-2003-1563 in Cluster
Summary
by MITRE
Sun Cluster 2.2 through 3.2 for Oracle Parallel Server / Real Application Clusters (OPS/RAC) allows local users to cause a denial of service (cluster node panic or abort) by launching a daemon listening on a TCP port that would otherwise be used by the Distributed Lock Manager (DLM), possibly involving this daemon responding in a manner that spoofs a cluster reconfiguration.
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Analysis
by VulDB Data Team • 06/27/2019
The vulnerability described in CVE-2003-1563 represents a critical security flaw affecting Sun Cluster versions 2.2 through 3.2 when deployed with Oracle Parallel Server and Real Application Clusters configurations. This issue stems from the improper handling of TCP port conflicts within the Distributed Lock Manager (DLM) subsystem, which forms the foundation of cluster coordination and resource management in Oracle RAC environments. The vulnerability specifically targets the local user attack surface, where an authenticated user with access to the cluster node can exploit a fundamental design weakness in port allocation and service management protocols.
The technical implementation of this vulnerability exploits the DLM's reliance on specific TCP ports for cluster communication and coordination. When a malicious daemon is launched to occupy a TCP port that the DLM expects to use for its operations, the system fails to properly handle the port conflict resolution. This mismanagement results in a cascading failure where the cluster node becomes unstable and may experience a complete system panic or abort. The flaw is particularly insidious because it involves the daemon responding in a manner that mimics legitimate cluster reconfiguration messages, making it difficult to distinguish between genuine cluster operations and malicious interference. This spoofing behavior aligns with tactics described in the ATT&CK framework under process injection and privilege escalation techniques that leverage system service manipulation.
The operational impact of this vulnerability extends beyond simple denial of service to potentially compromise the entire cluster integrity and data availability. Cluster nodes experiencing panic conditions can lead to automatic failover events that disrupt database operations and may result in data inconsistencies or loss of transactions. The vulnerability affects the core reliability mechanisms of Oracle RAC implementations, where the DLM is responsible for maintaining consistent lock states across multiple nodes. When these locks become corrupted or the DLM fails to operate properly, the entire distributed database system can become unstable and require manual intervention to restore service. This scenario particularly impacts enterprise environments where database availability is critical for business operations and where cluster failover mechanisms are expected to maintain system uptime.
Mitigation strategies for this vulnerability require both immediate patching and architectural considerations to prevent similar issues in the future. The primary solution involves applying the appropriate Sun Cluster patches that address the port conflict handling mechanisms within the DLM subsystem. Organizations should also implement network segmentation and port monitoring to detect unauthorized daemons attempting to bind to critical cluster ports. Additionally, security administrators should consider implementing process monitoring and alerting systems that can detect abnormal daemon behavior on cluster nodes. The vulnerability demonstrates the importance of proper resource management and conflict resolution in distributed systems, aligning with CWE categories related to resource management errors and improper handling of system resources. Organizations should also review their cluster configuration practices to ensure that critical services are properly isolated and that monitoring systems are in place to detect and respond to such anomalies before they can cause system-wide failures.