CVE-2012-1854 in Office
Summary
by MITRE
Untrusted search path vulnerability in VBE6.dll in Microsoft Office 2003 SP3, 2007 SP2 and SP3, and 2010 Gold and SP1; Microsoft Visual Basic for Applications (VBA); and Summit Microsoft Visual Basic for Applications SDK allows local users to gain privileges via a Trojan horse DLL in the current working directory, as demonstrated by a directory that contains a .docx file, aka "Visual Basic for Applications Insecure Library Loading Vulnerability," as exploited in the wild in July 2012.
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Analysis
by VulDB Data Team • 04/13/2026
The CVE-2012-1854 vulnerability represents a critical untrusted search path issue affecting Microsoft Office applications and Visual Basic for Applications environments. This flaw exists within VBE6.dll component that handles Visual Basic for Applications execution, creating a dangerous condition where malicious actors can load arbitrary code by placing specially crafted DLL files in the current working directory. The vulnerability specifically impacts Office 2003 SP3, 2007 SP2 and SP3, 2010 Gold and SP1 versions along with the Summit Microsoft Visual Basic for Applications SDK, making it a widespread concern across multiple Microsoft product lines.
The technical mechanism behind this vulnerability stems from improper DLL resolution behavior in the Visual Basic for Applications subsystem. When Office applications process documents containing VBA macros, the system searches for required libraries in a predictable order that includes the current working directory before checking system directories. This insecure search order allows attackers to place a malicious DLL named identically to a legitimate system library in the same directory as a vulnerable document. When the VBA engine attempts to load the expected library, it inadvertently loads the attacker-controlled DLL instead of the legitimate system component, enabling privilege escalation and code execution. This vulnerability maps directly to CWE-427 Uncontrolled Search Path Element and CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component, as it exploits both insecure library loading practices and improper path handling.
The operational impact of CVE-2012-1854 is particularly severe due to its exploitation in the wild during July 2012, demonstrating real-world threat actor interest and effectiveness. Attackers typically delivered malicious documents containing embedded VBA macros that would execute upon document opening, with the macro code placing a malicious DLL in the current working directory and triggering the vulnerable library loading sequence. This approach allowed adversaries to escalate privileges from standard user accounts to SYSTEM level access, enabling complete system compromise. The vulnerability's exploitation aligns with ATT&CK technique T1059.005 for Visual Basic and ATT&CK technique T1068 for Local Privilege Escalation, demonstrating how attackers leverage insecure library loading to achieve their objectives.
Mitigation strategies for this vulnerability require multiple layers of defense including immediate patching of affected Microsoft Office versions, implementation of strict directory permissions, and deployment of application whitelisting solutions. Microsoft released security updates addressing this issue in their regular monthly patches, and organizations should ensure all systems are updated with the latest security fixes. Additional protective measures include configuring Windows to use secure DLL loading practices, implementing least privilege user accounts, and monitoring for suspicious directory activities. Network administrators should also consider deploying security solutions that can detect and prevent the execution of suspicious VBA macros and monitor for anomalous library loading behaviors. The vulnerability highlights the importance of secure coding practices and proper library resolution mechanisms in preventing similar issues in the future.