CVE-2020-0631 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-2020-0625, CVE-2020-0626, CVE-2020-0627, CVE-2020-0628, CVE-2020-0629, CVE-2020-0630, 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 the manner in which the Windows Search Indexer processes objects in memory, creating an opportunity for malicious actors to escalate their privileges from standard user level to administrative privileges. The vulnerability exists within the core indexing functionality that Windows employs to provide fast search capabilities across files, emails, and other digital content stored on the system. The Windows Search Indexer service runs with elevated privileges to access and index various system resources, making it an attractive target for privilege escalation attacks.
The technical implementation of this vulnerability stems from improper handling of memory objects within the search indexing process. When the Windows Search Indexer encounters certain file types or malformed data structures during the indexing operation, it fails to properly validate or sanitize the memory objects before processing them. This memory handling flaw allows an attacker to craft malicious content that, when indexed by the search service, triggers unexpected behavior in the memory management system. The vulnerability manifests when the indexer attempts to process specially crafted objects that cause memory corruption or unexpected execution paths. This type of vulnerability falls under the CWE-121 category of 'Stack-based Buffer Overflow' and aligns with ATT&CK technique T1068 which describes 'Exploitation for Privilege Escalation' and T1059 which covers 'Command and Scripting Interpreter' as attackers may leverage this vulnerability to execute malicious code with elevated privileges.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a persistent foothold within the Windows environment. Once successfully exploited, an attacker can gain administrative access to the compromised system, enabling them to install malicious software, modify system files, access sensitive data, and potentially establish backdoors for continued access. The vulnerability affects multiple versions of Windows including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments. The attack vector typically involves placing malicious files in locations that are regularly indexed by the Windows Search service, such as user directories, shared network drives, or system folders. This allows the attacker to leverage the normal indexing process to execute their malicious code without requiring direct system access or complex exploitation techniques.
Organizations should implement multiple layers of defense to mitigate this vulnerability effectively. Immediate remediation involves applying the Microsoft security update released in the June 2020 Patch Tuesday cycle, which addresses the memory handling flaw in the Windows Search Indexer service. System administrators should also consider implementing additional security controls such as restricting the indexing of sensitive directories, disabling unnecessary search indexing services, and monitoring for unusual indexing activities. The vulnerability's exploitation typically requires the attacker to have local access to the system, making user access controls and privilege management crucial defensive measures. Network segmentation and monitoring solutions can help detect anomalous search indexing behaviors that might indicate exploitation attempts. Organizations should also consider implementing application whitelisting policies and ensuring that only trusted applications can interact with the Windows Search service. The ATT&CK framework suggests monitoring for suspicious process creation patterns and unusual memory access behaviors that could indicate exploitation attempts. Regular security assessments and vulnerability scanning should include checking for proper patch management and configuration of indexing services to prevent successful exploitation of this privilege escalation vulnerability.