CVE-2000-1082 in SQL Server
Summary
by MITRE
The xp_enumresultset function in SQL Server and Microsoft SQL Server Desktop Engine (MSDE) does not properly restrict the length of a buffer before calling the srv_paraminfo function in the SQL Server API for Extended Stored Procedures (XP), which allows an attacker to cause a denial of service or execute arbitrary commands, aka the "Extended Stored Procedure Parameter Parsing" vulnerability.
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Analysis
by VulDB Data Team • 04/24/2017
The CVE-2000-1082 vulnerability represents a critical buffer overflow condition affecting Microsoft SQL Server and Microsoft SQL Server Desktop Engine implementations. This flaw exists within the xp_enumresultset extended stored procedure which handles result set enumeration operations. The vulnerability stems from inadequate input validation and buffer length restrictions during parameter processing within the SQL Server API for Extended Stored Procedures. When an attacker supplies malformed input to this function, the system fails to properly validate the buffer size before invoking the srv_paraminfo function, creating an exploitable condition that can be leveraged for both denial of service and arbitrary code execution attacks.
The technical exploitation of this vulnerability occurs through manipulation of the parameter parsing mechanism within extended stored procedures. The flaw specifically targets the buffer management within the SQL Server Extended Stored Procedure API where the srv_paraminfo function is called without proper bounds checking. This allows attackers to overflow the allocated buffer space and potentially overwrite critical memory regions, enabling privilege escalation and arbitrary code execution. The vulnerability operates at the kernel level of SQL Server's extended procedure handling, making it particularly dangerous as it can bypass standard security mechanisms and directly impact the underlying operating system. This type of vulnerability is classified under CWE-121 as a stack-based buffer overflow, which represents a fundamental memory corruption issue that can lead to complete system compromise.
The operational impact of CVE-2000-1082 extends beyond simple denial of service conditions to encompass full system compromise capabilities. An attacker exploiting this vulnerability can execute arbitrary commands with the privileges of the SQL Server service account, which typically operates with elevated permissions. This creates a significant risk for database administrators who may inadvertently grant excessive privileges to database users or applications. The vulnerability affects both SQL Server and MSDE implementations, making it particularly widespread across enterprise environments. Organizations running these older versions face substantial risk as the exploit can be used to establish persistent backdoors, exfiltrate sensitive data, or disrupt business operations through service denial. The vulnerability's classification under ATT&CK technique T1059.002 (Command and Scripting Interpreter) and T1489 (Service Stop) demonstrates its potential for both execution and disruption attacks.
Mitigation strategies for CVE-2000-1082 should prioritize immediate patching of affected systems with Microsoft security updates, as this vulnerability has been addressed through official patches released by Microsoft. Organizations should implement network segmentation to limit access to SQL Server instances and disable unnecessary extended stored procedures where possible. Access controls should be strictly enforced through proper user authentication and authorization mechanisms, ensuring that only authorized personnel can execute potentially dangerous procedures. Network monitoring should be enhanced to detect anomalous patterns in extended stored procedure calls that might indicate exploitation attempts. Additionally, implementing application whitelisting policies and maintaining up-to-date vulnerability scanning tools can help identify systems running vulnerable versions of SQL Server. System administrators should also consider implementing database audit logging to track extended stored procedure usage and establish baseline behaviors for anomaly detection. The vulnerability highlights the critical importance of maintaining current security patches and implementing defense-in-depth strategies to protect against legacy vulnerabilities that remain exploitable in modern environments.