CVE-2020-0632 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-2020-0631, CVE-2020-0633.
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Analysis
by VulDB Data Team • 03/21/2024
The vulnerability described in CVE-2020-0632 represents a critical elevation of privilege flaw within the Windows Search Indexer component that operates at a system level. This vulnerability specifically manifests in how the Windows Search Indexer processes objects in memory, creating a potential pathway for malicious actors to escalate their privileges from standard user level to system level access. The Windows Search Indexer is a core Windows service responsible for indexing files and content to enable fast search functionality across the operating system, making it a prime target for attackers seeking persistent system access. The flaw exists within the memory handling mechanisms of this indexing service, where improper validation or processing of indexed objects could allow an attacker to manipulate memory structures and execute arbitrary code with elevated privileges.
From a technical perspective, this vulnerability operates through memory corruption mechanisms that exploit the way the Windows Search Indexer manages object references and memory allocation during the indexing process. The flaw likely involves improper bounds checking or use-after-free conditions when processing specially crafted files or content that gets indexed by the service. According to CWE classification, this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and potentially CWE-787, which covers out-of-bounds write vulnerabilities. The attack vector typically involves an attacker placing malicious content in locations that will be indexed by the Windows Search service, then triggering the vulnerability through specific search operations or system events that cause the indexed content to be processed in memory. This type of vulnerability falls under the ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' and specifically targets Windows operating systems through service exploitation.
The operational impact of CVE-2020-0632 is significant as it allows attackers to achieve system-level privileges without requiring physical access or complex exploitation techniques. Once successfully exploited, an attacker can gain complete control over the affected system, including the ability to install malware, modify system files, access sensitive data, and establish persistent backdoors. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly dangerous in enterprise environments where these systems are commonly deployed. The attack requires minimal privileges initially, as the Windows Search Indexer typically runs with elevated permissions to access various system files and content. This makes the vulnerability particularly attractive to threat actors as it provides a reliable method for privilege escalation that can be automated and repeated across multiple systems.
Mitigation strategies for CVE-2020-0632 focus primarily on applying the official Microsoft security updates that address the memory handling flaws within the Windows Search Indexer service. Organizations should prioritize patching all affected Windows systems as soon as possible, particularly those running Windows 10 versions 1903 and 1909, as well as Windows Server 2016 and Windows Server 2019. Additionally, implementing network segmentation and access controls can help limit the potential impact if an attacker does gain access through this vulnerability. System administrators should also consider disabling unnecessary search indexing features where possible, particularly in environments where the risk of exploitation is high. Monitoring for unusual search indexing activities or memory access patterns can help detect potential exploitation attempts, and implementing application whitelisting policies can prevent malicious executables from running with elevated privileges. The vulnerability demonstrates the importance of secure coding practices in system-level services and highlights the need for continuous security assessments of core operating system components that handle user input and system resources.