CVE-2001-0344 in SQL Server
Summary
by MITRE
An SQL query method in Microsoft SQL Server 2000 Gold and 7.0 using Mixed Mode allows local database users to gain privileges by reusing a cached connection of the sa administrator account.
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Analysis
by VulDB Data Team • 10/07/2025
This vulnerability exists in Microsoft SQL Server 2000 versions 7.0 and 2000 Gold when operating in Mixed Mode authentication, where both Windows and SQL Server authentication are enabled. The flaw stems from how the system handles cached database connections, specifically allowing local users with legitimate database access to exploit a connection reuse mechanism that retains elevated privileges from the sa administrator account. This represents a significant privilege escalation vulnerability that directly violates the principle of least privilege and proper access control enforcement.
The technical implementation of this vulnerability relies on the SQL Server connection pooling mechanism where cached connections maintain their original authentication context. When a local user establishes a connection to the database using their own credentials, the system may reuse an existing cached connection that was originally established with the sa account's elevated privileges. This occurs because the connection pool does not properly validate that the current user context matches the original authentication context when reusing connections. The flaw is particularly dangerous because it operates at the database layer without requiring additional exploitation techniques, making it a straightforward path for privilege escalation.
The operational impact of this vulnerability is severe as it allows any local database user to potentially gain administrative access to the SQL Server instance. Attackers can leverage this to execute arbitrary code, modify database contents, extract sensitive information, or even compromise the entire database server. The vulnerability affects organizations using Mixed Mode authentication where local users might have legitimate database access but should not have administrative privileges. This creates a dangerous situation where legitimate database users can escalate their privileges to the highest administrative level, potentially leading to complete system compromise and data breaches.
This vulnerability aligns with CWE-284 Access Control Issues and specifically relates to improper privilege management in database systems. From an ATT&CK framework perspective, this maps to privilege escalation techniques under T1068 and credential access under T1078, as attackers can reuse cached credentials to gain elevated privileges. Organizations should implement immediate mitigations including disabling Mixed Mode authentication where possible, implementing strict connection pooling policies, and ensuring proper privilege separation between database users and administrative accounts. The recommended approach involves configuring SQL Server to not reuse cached connections for elevated accounts, implementing proper connection timeout mechanisms, and regularly auditing database access patterns to detect unauthorized privilege escalation attempts. Additionally, organizations should consider upgrading to supported SQL Server versions that have addressed this and similar connection pooling vulnerabilities through improved authentication context validation mechanisms.