CVE-2020-0628 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-2020-0629, 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 vulnerability identified as CVE-2020-0628 represents a critical elevation of privilege flaw within the Windows Search Indexer component, which operates as a core system service responsible for indexing files and content across the Windows operating system. This vulnerability specifically manifests in how the Windows Search Indexer processes objects in memory, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. The flaw exists within the memory handling mechanisms of the search indexer service, which is designed to provide fast and efficient content search capabilities across file systems, email messages, and other digital content stored on Windows machines. The Windows Search Indexer service runs with elevated privileges to perform its indexing functions effectively, making it an attractive target for privilege escalation attacks. This vulnerability is particularly concerning because it allows attackers to bypass normal security boundaries that typically protect the operating system from unauthorized access and modification.
The technical root cause of this vulnerability stems from improper memory management within the Windows Search Indexer service implementation. When the service processes various file types and content objects for indexing purposes, it fails to properly validate or sanitize memory operations that could be manipulated by malicious input. This memory handling flaw creates opportunities for attackers to craft specific inputs or file types that, when processed by the indexer, trigger unintended memory behavior. The vulnerability specifically relates to how the indexer manages object references and memory allocation during the indexing process, potentially allowing for memory corruption or manipulation that could be exploited to execute arbitrary code with elevated privileges. According to CWE standards, this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities. The attack vector typically involves placing specially crafted files or content into locations that the Windows Search Indexer monitors and indexes, triggering the vulnerable memory handling code path.
The operational impact of CVE-2020-0628 extends far beyond simple privilege escalation, as successful exploitation can lead to complete system compromise and persistent access to target environments. Attackers who successfully exploit this vulnerability gain the ability to execute code with SYSTEM privileges, which provides unrestricted access to all system resources, files, and processes. This level of access enables attackers to install malware, modify system configurations, steal sensitive data, and establish persistence mechanisms that are difficult to detect and remove. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly widespread across enterprise environments where these operating systems are commonly deployed. The attack surface is broad since the Windows Search Indexer service continuously monitors and indexes files across various locations including user directories, network shares, and system folders, providing multiple potential entry points for exploitation. Security researchers have noted that the vulnerability can be exploited through various attack vectors including malicious documents, image files, or other content types that the indexer processes during normal operation, making it particularly dangerous in environments where users frequently interact with untrusted content.
Organizations affected by CVE-2020-0628 should implement immediate mitigations while awaiting official security patches from Microsoft. The most effective immediate mitigation involves disabling the Windows Search Indexer service or restricting its access to sensitive directories through appropriate access control lists and security policies. System administrators should also implement monitoring for unusual indexing behavior or memory access patterns that could indicate exploitation attempts. The vulnerability's classification under the MITRE ATT&CK framework places it within the privilege escalation category, specifically under techniques such as 'Exploitation for Privilege Escalation' and 'Process Injection' where attackers leverage service vulnerabilities to gain elevated access. Microsoft's official patch for this vulnerability addresses the memory handling issues in the Windows Search Indexer service, requiring system administrators to deploy the update as soon as possible. Additional defensive measures include implementing application whitelisting policies to restrict which files can be processed by the indexer, monitoring for suspicious file creation or modification patterns in locations monitored by the indexer, and conducting regular security assessments to identify potential exploitation attempts. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation, as the vulnerability's widespread nature means that once an attacker gains SYSTEM-level access, they can potentially move laterally throughout the network environment. The vulnerability's impact is further amplified in enterprise environments where the Windows Search Indexer service is actively used for content search and discovery, making comprehensive patch management and security monitoring essential for maintaining system integrity and protecting against this and similar vulnerabilities.