CVE-2007-4639 in EnterpriseDB Advanced Server
Summary
by MITRE
EnterpriseDB Advanced Server 8.2 does not properly handle certain debugging function calls that occur before a call to pldbg_create_listener, which allows remote authenticated users to cause a denial of service (daemon crash) and possibly execute arbitrary code via a SELECT statement that invokes a pldbg_ function, as demonstrated by (1) pldbg_get_stack and (2) pldbg_abort_target, which triggers use of an uninitialized pointer.
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability identified as CVE-2007-4639 affects EnterpriseDB Advanced Server version 8.2, representing a critical security flaw in the database management system's handling of debugging functions. This issue stems from improper initialization of debugging components within the system's architecture, specifically when certain debugging functions are invoked before the establishment of the debugging listener. The vulnerability exists in the PostgreSQL-based database server implementation and demonstrates a classic example of improper initialization leading to memory corruption issues.
The technical flaw manifests when remote authenticated users execute specific SELECT statements that invoke pldbg_ functions, particularly pldbg_get_stack and pldbg_abort_target. These functions trigger the use of uninitialized pointers within the debugging subsystem, creating a scenario where memory addresses contain unpredictable values. When these uninitialized pointers are dereferenced during function execution, they can cause the database daemon to crash abruptly or potentially lead to arbitrary code execution. This vulnerability operates at the intersection of memory safety issues and privilege escalation, as it requires authentication but can be exploited remotely, making it particularly dangerous in networked environments.
The operational impact of this vulnerability extends beyond simple denial of service, as the potential for arbitrary code execution creates significant security risks for database environments. Attackers who can authenticate to the database system can leverage this flaw to compromise the entire database server, potentially gaining access to sensitive data, escalating privileges, or using the compromised system as a pivot point for further attacks within the network infrastructure. The vulnerability affects database administrators who may not be aware of the debugging functions being exposed, as these functions are typically intended for development and testing environments but remain accessible in production systems.
Mitigation strategies should focus on immediate patching of the EnterpriseDB Advanced Server to version 8.3 or later, which includes proper initialization of debugging functions. Database administrators should also implement network segmentation to limit access to database systems and disable unnecessary debugging functions in production environments. The vulnerability aligns with CWE-457: Use of uninitialized variable, which is categorized under the broader category of memory safety issues in the CWE taxonomy. From an ATT&CK framework perspective, this vulnerability maps to T1059.006: Command and Scripting Interpreter: PowerShell and T1499.004: Network Denial of Service, as it enables both remote code execution and service disruption. Organizations should also consider implementing network monitoring to detect unusual SELECT statements targeting debugging functions, as well as regular security audits to identify and disable unused database functionality that could serve as attack vectors.