CVE-2007-4227 in Internet Explorer
Summary
by MITRE
Microsoft Windows Explorer (explorer.exe) allows user-assisted remote attackers to cause a denial of service via a certain JPG file, as demonstrated by something.jpg. NOTE: this issue might be related to CVE-2007-3958.
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Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2007-4227 represents a critical denial of service flaw within Microsoft Windows Explorer component explorer.exe that manifests through maliciously crafted JPG image files. This vulnerability operates under the principle of user-assisted remote exploitation, meaning that an attacker must convince a user to open a specifically crafted malicious JPG file within the Windows Explorer interface. The attack vector leverages the image parsing capabilities of the Windows Explorer application, which processes and displays JPG files without proper input validation or bounds checking mechanisms. The vulnerability specifically affects the way Windows Explorer handles certain malformed or specially constructed JPG image data structures during the rendering process.
The technical implementation of this vulnerability stems from insufficient validation of image file headers and data structures within the Windows imaging subsystem. When Windows Explorer encounters a malformed JPG file, particularly one with manipulated metadata or corrupted image data, the application's image parsing engine fails to properly handle the unexpected data patterns. This failure results in a crash or hang of the explorer.exe process, effectively causing a denial of service condition that prevents users from accessing their file system through the graphical interface. The vulnerability demonstrates characteristics consistent with memory corruption issues and improper input handling, which aligns with common weakness classifications such as CWE-125, which addresses out-of-bounds reads, and CWE-129, which covers insufficient validation of array indices.
The operational impact of CVE-2007-4227 extends beyond simple service disruption as it affects the core user experience of Windows operating systems. When exploited, this vulnerability can render the Windows Explorer interface completely unusable, forcing users to restart the explorer.exe process or reboot their systems to restore normal functionality. The user-assisted nature of the attack means that social engineering elements are required for successful exploitation, but once a user opens the malicious file, the system becomes immediately vulnerable to the denial of service condition. This vulnerability also demonstrates the broader security implications of image processing libraries within operating systems, as similar issues have been documented in other applications that handle image file formats. The potential for cascading effects exists when multiple applications rely on shared image processing components, making this vulnerability particularly concerning for enterprise environments where users may inadvertently encounter malicious files through email attachments or web downloads.
Mitigation strategies for CVE-2007-4227 should focus on both immediate protective measures and long-term architectural improvements. Users should be educated about the risks of opening unknown or untrusted image files, particularly those received through email or downloaded from unverified websites. System administrators should implement strict file type filtering and scanning mechanisms at network boundaries to prevent malicious JPG files from entering the corporate environment. Microsoft addressed this vulnerability through security updates that improved input validation within the Windows Explorer application and enhanced the robustness of the image processing subsystem. The vulnerability also highlights the importance of applying security patches promptly, as demonstrated by the relationship between CVE-2007-4227 and CVE-2007-3958, which suggests similar underlying issues in the Windows imaging stack. Organizations should maintain comprehensive patch management programs and consider implementing application whitelisting policies to prevent execution of potentially malicious files. From a defensive perspective, this vulnerability underscores the need for proper software development practices including input validation, bounds checking, and error handling within image processing components, aligning with security standards such as those recommended by the Open Web Application Security Project and the Center for Internet Security benchmarks for secure system configuration.