CVE-2012-1891 in Data Access Components
Summary
by MITRE
Heap-based buffer overflow in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2 and Windows Data Access Components (WDAC) 6.0 allows remote attackers to execute arbitrary code via crafted XML data that triggers access to an uninitialized object in memory, aka "ADO Cachesize Heap Overflow RCE Vulnerability."
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Analysis
by VulDB Data Team • 01/02/2025
The CVE-2012-1891 vulnerability represents a critical heap-based buffer overflow affecting Microsoft Data Access Components and Windows Data Access Components versions 2.8 SP1 and SP2 as well as WDAC 6.0. This vulnerability specifically targets the ActiveX Data Objects (ADO) functionality within these components, creating a dangerous condition where remote attackers can execute arbitrary code on affected systems. The flaw occurs when processing crafted XML data that causes the ADO component to access an uninitialized object in memory, leading to potential system compromise. This vulnerability demonstrates the inherent risks associated with complex data parsing mechanisms and memory management in enterprise software components.
The technical exploitation of this vulnerability leverages a heap-based buffer overflow condition that occurs during XML data processing within the ADO caching mechanism. When malformed XML data is processed by the affected MDAC or WDAC components, the system allocates memory for caching purposes but fails to properly initialize the allocated heap space. This uninitialized memory access creates a predictable pattern that attackers can exploit to overwrite critical memory locations, ultimately allowing code execution. The vulnerability is particularly dangerous because it operates at the heap level, making it difficult to detect and exploit through conventional means, and it specifically targets the Cachesize parameter handling within ADO components.
The operational impact of CVE-2012-1891 extends beyond simple remote code execution to encompass complete system compromise and potential lateral movement within network environments. Attackers exploiting this vulnerability can gain unauthorized access to systems running vulnerable versions of MDAC or WDAC, potentially escalating privileges and establishing persistent access. The vulnerability affects systems that process XML data through ADO components, which includes numerous enterprise applications, web services, and database connectivity solutions. Organizations with systems running affected software versions face significant risk of data breaches, system infiltration, and potential disruption of critical business operations. This vulnerability aligns with ATT&CK technique T1203 for Exploitation for Client Execution and CWE-121 for Stack-based Buffer Overflow, though the heap-based nature places it in the broader category of memory corruption vulnerabilities.
Mitigation strategies for CVE-2012-1891 require immediate patching of affected systems with Microsoft security updates, as this vulnerability has been addressed through official Microsoft security bulletins. Organizations should implement network segmentation to limit exposure of systems running vulnerable MDAC or WDAC components, particularly those handling untrusted XML data. Input validation and sanitization measures should be enhanced to filter malicious XML content before processing, though this approach provides only partial protection given the underlying memory corruption nature. Security monitoring should focus on detecting unusual XML processing activities and memory access patterns that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software components and implementing robust security practices for enterprise data access infrastructure. System administrators should prioritize immediate remediation and conduct comprehensive vulnerability assessments to identify other potentially affected components within their environments.