CVE-2020-0625 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the Windows Search Indexer handles objects in memory, aka 'Windows Search Indexer Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0613, CVE-2020-0614, CVE-2020-0623, CVE-2020-0626, CVE-2020-0627, CVE-2020-0628, CVE-2020-0629, CVE-2020-0630, CVE-2020-0631, CVE-2020-0632, CVE-2020-0633.
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Analysis
by VulDB Data Team • 03/21/2024
The Windows Search Indexer elevation of privilege vulnerability represents a critical security flaw in Microsoft's indexing service that operates within the Windows operating system. This vulnerability specifically affects how the Windows Search Indexer processes objects in memory, creating an exploitable condition that allows malicious actors to escalate their privileges from standard user level to SYSTEM level access. The flaw exists in the memory handling mechanisms of the search indexing service, which is a core component of Windows that maintains indexes of files and content for rapid search capabilities. When the indexer encounters certain malformed or specially crafted objects in memory, it fails to properly validate or sanitize these inputs, leading to potential code execution and privilege escalation opportunities. This vulnerability impacts multiple versions of Windows including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly concerning given the widespread deployment of these operating systems in enterprise environments.
The technical nature of this vulnerability stems from improper memory management within the Windows Search Indexer service, which operates with elevated privileges to access and index system files. According to CWE classification, this represents a weakness in the memory handling mechanisms that could lead to arbitrary code execution through improper input validation. The vulnerability allows attackers to craft specific content or file structures that, when processed by the search indexer, trigger memory corruption conditions. This memory corruption can be exploited to execute malicious code within the context of the search indexer process, which runs with high privileges. The ATT&CK framework categorizes this as a privilege escalation technique, specifically leveraging the "Exploitation for Privilege Escalation" tactic where adversaries use software vulnerabilities to gain elevated system access. The flaw is particularly dangerous because it operates at the system level and can be triggered through normal file indexing operations, making it difficult to detect and prevent through traditional user behavior monitoring.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially enable complete system compromise. Once an attacker achieves SYSTEM level access through this vulnerability, they can manipulate system files, install persistent backdoors, access sensitive data, and establish footholds for further lateral movement within the network. The vulnerability can be exploited through various attack vectors including malicious file attachments, compromised websites, or even through legitimate software that triggers indexing operations. The search indexer service is frequently active and processes numerous file types, creating multiple opportunities for exploitation. Organizations may experience significant security breaches as this vulnerability can be leveraged to bypass traditional security controls and gain unrestricted access to critical systems. The impact is particularly severe in enterprise environments where the search indexer service is actively used and where sensitive corporate data is indexed and searchable.
Mitigation strategies for this vulnerability require immediate patch application through Microsoft's security updates, as the primary fix involves correcting the memory handling logic within the Windows Search Indexer service. Organizations should implement the relevant security patches as soon as they become available, typically through Windows Update or Microsoft Update Catalog. Additionally, system administrators should consider implementing additional security controls such as restricting access to the search indexer service, monitoring for unusual indexing activities, and applying principle of least privilege configurations. Network segmentation and monitoring solutions should be deployed to detect potential exploitation attempts, particularly focusing on unusual memory access patterns or privilege escalation events. Security teams should also consider disabling unnecessary indexing features or restricting indexing of sensitive directories. According to Microsoft security best practices, organizations should maintain up-to-date antivirus signatures and implement behavioral monitoring to detect potential exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems that may not have received the necessary patches, as this vulnerability can remain exploitable for extended periods if left unaddressed.