CVE-2007-4665 in SQL Server
Summary
by MITRE
Unspecified vulnerability in the server in Firebird before 2.0.2 allows remote attackers to cause a denial of service (daemon crash) via an XNET session that makes multiple simultaneous requests to register events, aka CORE-1403.
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Analysis
by VulDB Data Team • 07/08/2019
The vulnerability identified as CVE-2007-4665 represents a critical denial of service flaw within the Firebird database server software ecosystem. This issue affects Firebird versions prior to 2.0.2 and specifically targets the server component's handling of XNET sessions. The vulnerability manifests when multiple simultaneous requests are made to register events within a single XNET session, leading to daemon crashes that effectively deny service to legitimate users. This represents a classic resource exhaustion attack vector that leverages the server's event registration mechanism to destabilize the entire database service.
The technical implementation of this vulnerability stems from inadequate input validation and resource management within the Firebird server's XNET protocol handler. When an XNET session receives multiple concurrent event registration requests, the server fails to properly handle the resource allocation and request processing, resulting in memory corruption or stack overflow conditions that cause the daemon to terminate unexpectedly. This flaw operates at the protocol level and demonstrates poor defensive programming practices in handling concurrent operations within a single session context. The vulnerability maps to CWE-121, which addresses stack-based buffer overflow conditions, and CWE-400, which covers unspecified resource management issues that can lead to denial of service scenarios.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise database availability and integrity. Remote attackers can exploit this weakness without requiring authentication credentials, making it particularly dangerous in networked environments where database servers are accessible to untrusted parties. The daemon crash creates a window of service unavailability that can last from several seconds to minutes depending on system recovery mechanisms. Organizations running Firebird versions before 2.0.2 face significant risk of operational disruption, especially in mission-critical applications where database availability is paramount. This vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks targeting database services, and represents a common vector for service disruption in database infrastructure.
Mitigation strategies for CVE-2007-4665 primarily focus on immediate version upgrades to Firebird 2.0.2 or later, which contain the necessary patches to address the XNET session handling flaw. Organizations should implement network segmentation to limit access to database servers and deploy intrusion detection systems that can monitor for unusual patterns of event registration requests. Additional protective measures include implementing rate limiting on event registration operations and establishing robust monitoring for daemon restart events. System administrators should also consider implementing automated failover mechanisms and backup procedures to minimize the impact of potential service disruptions. The vulnerability serves as a reminder of the importance of keeping database software updated and implementing proper access controls to limit exposure to such protocol-level flaws that can be exploited remotely without authentication.