CVE-2007-1912 in Windows
Summary
by MITRE
Heap-based buffer overflow in Microsoft Windows allows user-assisted remote attackers to have an unknown impact via a crafted .HLP file.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability identified as CVE-2007-1912 represents a critical heap-based buffer overflow flaw within Microsoft Windows operating systems that specifically affects the handling of Help file (.HLP) formats. This vulnerability resides in the Windows Help system and demonstrates how legacy file processing mechanisms can contain exploitable memory management errors that persist across multiple Windows versions. The flaw occurs when the Windows Help engine processes specially crafted .HLP files that contain malformed data structures, leading to memory corruption that can be leveraged by remote attackers.
The technical implementation of this vulnerability involves the improper bounds checking within the Windows Help file parser, where heap memory allocation occurs based on data extracted from the malicious .HLP file. When the parser encounters oversized or malformed data fields within the help file structure, it fails to validate the input properly before copying data into fixed-size heap buffers. This inadequate validation allows attackers to overflow the allocated buffer space and overwrite adjacent memory locations, potentially corrupting critical program structures or executing arbitrary code. The vulnerability is classified under CWE-121 as a heap-based buffer overflow, which is a well-documented weakness in memory management that has been extensively studied in cybersecurity literature.
The operational impact of CVE-2007-1912 extends beyond simple system instability, as it provides attackers with a mechanism to execute arbitrary code with the privileges of the user running the affected Windows application. This user-assisted remote attack vector means that an attacker can potentially deliver the malicious .HLP file through various means such as email attachments, web downloads, or malicious websites, requiring only user interaction to trigger the exploit. The vulnerability affects multiple Windows versions including Windows 2000, Windows XP, and Windows Server 2003, making it particularly dangerous as it targets widely deployed systems. According to ATT&CK framework, this vulnerability maps to T1203 - Exploitation for Client Execution, where attackers leverage application vulnerabilities to execute malicious code on target systems.
Mitigation strategies for this vulnerability require immediate patch application from Microsoft as part of the Windows Update process, since the flaw was addressed through the security bulletin MS07-017. Organizations should also implement additional defensive measures including email filtering to block suspicious .HLP file attachments, disabling help file processing in web browsers, and implementing application whitelisting policies to prevent execution of untrusted help files. Network administrators should consider implementing firewall rules that restrict access to help file repositories and monitor for unusual patterns of help file access that might indicate exploitation attempts. The vulnerability also underscores the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments to identify similar memory corruption flaws in other legacy Windows components that might not have been addressed through traditional security updates.