CVE-2007-0034 in Outlook
Summary
by MITRE
Buffer overflow in the Advanced Search (Finder.exe) feature of Microsoft Outlook 2000, 2002, and 2003 allows user-assisted remote attackers to execute arbitrary code via a crafted Outlook Saved Searches (OSS) file that triggers memory corruption, aka "Microsoft Outlook Advanced Find Vulnerability."
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2007-0034 represents a critical buffer overflow flaw within Microsoft Outlook's Advanced Search functionality, specifically affecting versions 2000, 2002, and 2003. This weakness resides in the Finder.exe component that processes Outlook Saved Searches files with the .oss extension, creating a significant attack surface that adversaries can exploit through carefully crafted malicious files. The vulnerability operates under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory regions. This particular flaw enables attackers to manipulate memory layout during the processing of search parameters, ultimately leading to arbitrary code execution within the context of the Outlook application.
The technical exploitation mechanism involves the manipulation of the .oss file format which Outlook uses to store saved search configurations. When a user opens a maliciously crafted .oss file, the Advanced Search feature processes the file contents without adequate input validation, causing a buffer overflow in the memory allocation used for handling search parameters. This memory corruption typically occurs in the stack-based buffer where search criteria are stored, allowing attackers to overwrite adjacent memory locations including return addresses and function pointers. The vulnerability specifically targets the way the application handles search term parsing and storage, making it particularly dangerous as it can be triggered through normal user interaction with email attachments or saved search files.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the ability to gain complete control over the affected system running vulnerable Outlook versions. Since the exploit requires user interaction through opening a malicious file, it represents a classic user-assisted remote attack vector that can be delivered via email attachments, file sharing networks, or compromised websites. The attack scenario typically involves an attacker sending a specially crafted .oss file as an email attachment, which when opened by the victim triggers the buffer overflow and allows remote code execution with the privileges of the logged-in user. This vulnerability directly maps to ATT&CK technique T1203, which covers exploitation for privilege escalation through malicious file execution.
Mitigation strategies for CVE-2007-0034 primarily focus on immediate patching of affected Outlook versions, with Microsoft releasing security updates that address the buffer overflow in the Finder.exe component. Organizations should implement strict email filtering policies to block suspicious .oss files and other potentially malicious attachments, while also ensuring that users are educated about the risks of opening unknown email attachments. The vulnerability demonstrates the importance of input validation in email client applications and highlights the need for proper bounds checking in all memory operations. Additionally, system administrators should consider implementing application whitelisting policies that restrict execution of untrusted files and maintain regular security updates across all Microsoft Office installations to prevent exploitation of similar vulnerabilities in the future.