CVE-2012-0182 in Word
Summary
by MITRE
Microsoft Word 2007 SP2 and SP3 does not properly handle memory during the parsing of Word documents, which allows remote attackers to execute arbitrary code via a crafted document, aka "Word PAPX Section Corruption Vulnerability."
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Analysis
by VulDB Data Team • 04/14/2021
The vulnerability identified as CVE-2012-0182 represents a critical memory corruption flaw within Microsoft Word 2007 SP2 and SP3 that stems from improper handling of memory during document parsing operations. This vulnerability specifically affects the Word PAPX section processing mechanism, which is responsible for managing paragraph formatting properties within word processing documents. The flaw occurs when the application encounters malformed or specially crafted Word documents that contain maliciously constructed PAPX data structures. According to the CWE catalog, this vulnerability maps to CWE-125, which describes out-of-bounds read conditions where an application accesses memory beyond the boundaries of a buffer or data structure. The vulnerability exists at the intersection of memory management and document parsing, creating a pathway for attackers to exploit the application's failure to validate input data properly.
The technical exploitation of this vulnerability involves crafting a malicious Word document that contains malformed PAPX section data designed to trigger a memory corruption condition when Word attempts to parse and render the document. When the vulnerable Word application processes such a document, the improper memory handling causes the application to overwrite memory locations or access invalid memory addresses, which can be leveraged by attackers to execute arbitrary code with the privileges of the user running the application. This type of vulnerability falls under the ATT&CK technique T1203, which describes exploitation of software vulnerabilities to gain execution privileges. The attack typically requires social engineering to deliver the malicious document to a target, as remote code execution occurs only when the user opens the specially crafted file.
The operational impact of CVE-2012-0182 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and persistent access within the target environment. Attackers can leverage this vulnerability to establish backdoors, escalate privileges, or deploy additional malicious payloads. The vulnerability affects Microsoft Word 2007 SP2 and SP3 specifically, indicating that users running other versions of Microsoft Office or updated versions of Word would not be vulnerable. This makes the vulnerability particularly concerning for organizations that have not updated their software, as Word 2007 was widely deployed in enterprise environments. The vulnerability's remote exploit capability means that attackers can deliver malicious documents through various channels including email attachments, web downloads, or malicious websites without requiring local access to the target system.
Mitigation strategies for this vulnerability primarily focus on applying the appropriate security patches provided by Microsoft, which address the memory handling issues in the PAPX section parsing code. Organizations should prioritize immediate deployment of the Microsoft security update released in response to this vulnerability, as the patch corrects the memory management flaws that enable the exploitation. Additionally, implementing defensive measures such as email filtering, document scanning, and user education about suspicious attachments can provide additional protection layers. Network segmentation and application whitelisting can further reduce the attack surface by limiting which systems can execute potentially malicious documents. According to industry best practices, organizations should maintain up-to-date antivirus signatures and employ sandboxing technologies to analyze suspicious documents before they reach end users. The vulnerability also highlights the importance of keeping all Microsoft Office applications updated, as similar memory corruption issues may exist in other components of the Office suite.