CVE-2007-2237 in Windows
Summary
by MITRE
Microsoft Windows Graphics Device Interface (GDI+, GdiPlus.dll) allows context-dependent attackers to cause a denial of service (crash) via an ICO file with an InfoHeader containing a Height of zero, which triggers a divide-by-zero error.
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Analysis
by VulDB Data Team • 01/13/2025
The vulnerability described in CVE-2007-2237 represents a classic divide-by-zero error within Microsoft Windows Graphics Device Interface component known as GDI+. This flaw exists in the GdiPlus.dll library which handles graphics processing operations for Windows applications. The vulnerability specifically manifests when processing ICO (Icon) files, which are used to store icons and cursors in Windows operating systems. When an attacker crafts an ICO file with a malformed InfoHeader structure containing a Height value of zero, the graphics processing code attempts to perform a mathematical division operation by this zero value, resulting in a system crash or denial of service condition.
The technical exploitation of this vulnerability demonstrates a fundamental programming error that falls under CWE-369, known as Divide by Zero. This weakness occurs when a program attempts to divide a number by zero, which is mathematically undefined and causes program termination in most computing environments. The GDI+ component fails to properly validate the Height field within the ICO file's InfoHeader structure before performing calculations that depend on this value. This type of input validation failure represents a common class of software vulnerabilities that can be exploited to cause system instability and denial of service conditions.
From an operational perspective, this vulnerability poses significant risks to Windows systems that process untrusted ICO files, particularly in environments where users might encounter malicious attachments or download files from unverified sources. The impact extends beyond simple system crashes as it can be leveraged as part of broader attack strategies within the MITRE ATT&CK framework, specifically under the T1499 category for Network Denial of Service. Systems running Windows applications that handle graphic file processing, such as web browsers, email clients, and file managers, become vulnerable to exploitation. The vulnerability affects multiple Windows versions including Windows 2000, XP, and Server 2003, making it a widespread concern across enterprise environments that have not implemented proper patch management protocols.
The mitigation strategies for this vulnerability primarily involve applying the security updates provided by Microsoft through their regular patching cycles. Organizations should prioritize deployment of the Microsoft security bulletin MS07-022 which addresses this specific divide-by-zero error in GDI+. Additionally, implementing proper input validation measures at network boundaries and user endpoints can help prevent exploitation of this vulnerability. Security professionals should consider deploying network segmentation and access controls to limit exposure of systems that might process untrusted graphic files. The vulnerability also highlights the importance of secure coding practices and thorough input validation, particularly when dealing with file format parsing operations that involve mathematical computations. Organizations should maintain robust vulnerability management processes to ensure timely patch deployment and reduce the window of exposure for such critical flaws that can be exploited to cause system instability and denial of service conditions.