CVE-2004-0572 in Windows
Summary
by MITRE
Buffer overflow in the Windows Program Group Converter (grpconv.exe) may allow remote attackers to execute arbitrary code via a shell: URL with a long filename and a .grp extension, which is not properly handled when the shell capability launches grpconv.exe.
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Analysis
by VulDB Data Team • 07/13/2025
The vulnerability described in CVE-2004-0572 represents a critical buffer overflow flaw within the Windows Program Group Converter utility grpconv.exe. This vulnerability exists in the Windows operating system's handling of shell: URLs with specific file extensions, creating a pathway for remote code execution attacks. The issue specifically manifests when the system processes a shell: URL containing a filename that exceeds buffer capacity limits while maintaining a .grp file extension, which triggers the execution of grpconv.exe with malformed input parameters.
The technical exploitation of this vulnerability occurs through the improper validation of input parameters within the Windows shell handling mechanism. When a maliciously crafted shell: URL is processed, the system automatically invokes grpconv.exe to handle the .grp file extension, but fails to properly sanitize or limit the length of the filename parameter. This creates a classic buffer overflow condition where data written to a fixed-size memory buffer exceeds its allocated capacity, potentially overwriting adjacent memory locations including return addresses and executable code segments. The flaw operates at the application layer and leverages the Windows shell's automatic execution of associated programs when handling specific URL schemes.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass potential system compromise and privilege escalation. Attackers can leverage this weakness to execute arbitrary code with the privileges of the user who processes the malicious URL, potentially leading to full system control. The vulnerability's remote exploitability means that attackers can trigger the malicious code execution through web-based attacks, email attachments, or other vector that delivers the specially crafted shell: URL. This makes the vulnerability particularly dangerous in enterprise environments where users frequently interact with web content and email systems.
Security professionals should consider this vulnerability in the context of the Common Weakness Enumeration framework, where it maps to CWE-121, which describes stack-based buffer overflow conditions. The attack pattern aligns with the MITRE ATT&CK framework's technique T1059 for command and scripting interpreter, specifically through the use of Windows shell command execution. Organizations should implement immediate mitigations including disabling automatic execution of shell: URLs, applying relevant security patches from Microsoft, and implementing network-based protections such as URL filtering and sandboxing mechanisms to prevent users from accessing malicious content that could trigger this vulnerability. The vulnerability also highlights the importance of proper input validation and boundary checking in system utilities, particularly those involved in processing user-supplied data through shell interfaces.