CVE-2008-1435 in Windows
Summary
by MITRE
Windows Explorer in Microsoft Windows Vista up to SP1, and Server 2008, allows user-assisted remote attackers to execute arbitrary code via crafted saved-search (.search-ms) files that are not properly handled when saving, aka "Windows Saved Search Vulnerability."
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Analysis
by VulDB Data Team • 03/16/2021
The Windows Saved Search Vulnerability represents a critical security flaw in Microsoft Windows Vista and Server 2008 operating systems up to Service Pack 1. This vulnerability specifically targets Windows Explorer's handling of .search-ms files, which are used to store saved search queries and results within the Windows operating system. The flaw arises from inadequate validation and processing of these specially crafted files, creating a potential attack vector for remote code execution. The vulnerability is classified under CWE-119 as a buffer overflow condition, where insufficient bounds checking allows malicious data to overwrite adjacent memory locations. This issue falls within the ATT&CK framework under T1059 for Command and Scripting Interpreter and T1203 for Exploitation for Client Execution, as it enables attackers to execute arbitrary code on targeted systems through user interaction with malicious search files.
The technical exploitation of this vulnerability occurs when a user encounters a malicious .search-ms file either through email attachments, web downloads, or network shares. When Windows Explorer processes these files, it fails to properly validate the file structure and content, allowing attackers to craft specially formatted files that trigger memory corruption. The vulnerability specifically manifests when the system attempts to save or process these search files, creating an opportunity for attackers to inject malicious code into the system's memory space. The flaw is particularly dangerous because it requires only user interaction to exploit, making it a prime target for social engineering attacks. The attack typically involves crafting a .search-ms file that contains malicious embedded content or references to external resources that, when processed by Windows Explorer, execute code with the privileges of the logged-in user. This process leverages the Windows shell's handling of saved searches and can potentially escalate privileges depending on the target system configuration.
The operational impact of this vulnerability extends beyond simple remote code execution, as it can lead to complete system compromise and persistent access for attackers. Once successfully exploited, adversaries can install backdoors, steal sensitive data, or establish command and control channels without requiring administrative privileges. The vulnerability affects all versions of Windows Vista and Server 2008, including their respective service packs, making it particularly concerning for enterprise environments where these operating systems were widely deployed. Organizations running these systems face significant risk of unauthorized access and data breaches, as the attack vector requires minimal technical sophistication to execute. The vulnerability's user-assisted nature means that successful exploitation depends on users opening malicious files, but this requirement does not significantly reduce the threat level given the prevalence of email-based attacks and social engineering techniques that can trick users into executing malicious code.
Mitigation strategies for this vulnerability must address both immediate protection and long-term system hardening. Microsoft released patches for this vulnerability through Windows Update, which should be deployed immediately across all affected systems. System administrators should implement application whitelisting policies to restrict execution of unknown or untrusted search files, while also configuring Windows Explorer to disable automatic processing of potentially malicious file types. Network-based protections such as firewalls and intrusion detection systems can help identify and block traffic patterns associated with exploitation attempts. Additionally, user education programs should emphasize the dangers of opening unexpected email attachments or downloading files from untrusted sources. Organizations should also consider implementing security configurations that disable the automatic execution of search files and restrict user permissions to prevent privilege escalation. The vulnerability demonstrates the importance of proper input validation and memory management in operating system components, highlighting the need for comprehensive security testing of file handling mechanisms in enterprise environments.