CVE-2012-0183 in Word
Summary
by MITRE
Microsoft Word 2003 SP3 and 2007 SP2 and SP3, Office 2008 and 2011 for Mac, and Office Compatibility Pack SP2 and SP3 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted RTF data, aka "RTF Mismatch Vulnerability."
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Analysis
by VulDB Data Team • 01/05/2025
The CVE-2012-0183 vulnerability represents a critical memory corruption flaw affecting multiple versions of Microsoft Office applications including Word 2003 SP3 and 2007 SP2 and SP3, Office 2008 and 2011 for Mac, and the Office Compatibility Pack SP2 and SP3. This vulnerability specifically targets the Rich Text Format (RTF) parsing engine within these applications, creating a pathway for remote code execution or denial of service attacks through maliciously crafted RTF content. The vulnerability stems from improper handling of RTF data structures during the parsing process, where the application fails to properly validate or sanitize input data before processing it. This flaw falls under the CWE-125 vulnerability category, which describes out-of-bounds read conditions that occur when a program reads data past the end of a valid buffer, leading to memory corruption and potential arbitrary code execution.
The technical implementation of this vulnerability involves the exploitation of a buffer overflow condition within Microsoft Word's RTF parser. When an application processes a specially crafted RTF document, the parser encounters malformed or oversized data structures that exceed the allocated memory boundaries. This misalignment between expected and actual data processing creates opportunities for attackers to manipulate memory contents and potentially execute malicious code with the privileges of the targeted user. The vulnerability is particularly dangerous because it can be triggered through various attack vectors including email attachments, web downloads, or document sharing platforms where RTF files are commonly used for formatting text. The attack surface extends beyond simple document viewing since many users expect RTF files to be safe and automatically process them without additional security scrutiny.
From an operational perspective, this vulnerability poses significant risks to enterprise environments where Office applications are widely deployed and users frequently encounter RTF documents in their daily workflows. The remote execution capability means that attackers can compromise systems without requiring physical access or user interaction beyond opening a malicious document. The memory corruption aspect can result in application crashes, system instability, or complete system compromise depending on the execution context and privileges available to the compromised process. Organizations using affected Office versions face potential data breaches, system downtime, and the need for emergency patch deployment across their entire user base. This vulnerability aligns with ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain access to systems, and demonstrates how seemingly benign file formats can become attack vectors in modern threat landscapes.
Mitigation strategies for CVE-2012-0183 primarily involve immediate patch deployment from Microsoft, as the company released security updates addressing this specific vulnerability. Organizations should also implement defensive measures including email filtering rules that block RTF attachments, document validation policies that require RTF file scanning before processing, and user education about avoiding suspicious document attachments. Network-based protections such as intrusion detection systems can help identify attempts to deliver malicious RTF content, while application whitelisting can prevent unauthorized Office versions from executing. Security teams should also consider disabling RTF processing capabilities in applications where they are not essential, and implement comprehensive monitoring for unusual Office process behavior that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing layered security approaches that protect against both known and emerging threats in enterprise environments.