CVE-2020-0627 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-2020-0628, 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 vulnerability identified as CVE-2020-0627 represents a critical elevation of privilege flaw within the Windows Search Indexer component, which operates as a core system service responsible for indexing content across file systems and applications to enable fast search capabilities. This vulnerability specifically manifests in 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 Windows Search Indexer service runs with elevated privileges by design to access and index files across the system, making it an attractive target for attackers seeking to leverage existing system access for privilege escalation. The flaw exists within the memory handling mechanisms of the indexer service, where improper validation or sanitization of indexed objects could lead to arbitrary code execution with elevated privileges.
The technical nature of this vulnerability stems from improper memory management within the Windows Search Indexer service, which operates under the Windows operating system's security model where legitimate system services must maintain strict memory boundaries to prevent unauthorized access. When the indexer processes certain file types or objects in memory, it fails to properly validate or sanitize the data structures being handled, potentially allowing crafted malicious input to manipulate memory contents. This memory corruption issue creates a condition where an attacker can inject or manipulate objects in memory that are subsequently processed by the elevated indexer service. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflow scenarios, as these memory handling issues can lead to privilege escalation through controlled memory corruption. The flaw represents a classic example of how system services with elevated privileges can become attack vectors when memory management is insufficiently validated.
The operational impact of CVE-2020-0627 is significant as it provides attackers with a pathway to achieve SYSTEM-level privileges without requiring additional exploitation techniques or prerequisites. Once an attacker gains initial access to a Windows system, they can leverage this vulnerability to escalate their privileges and gain complete control over the affected system. This makes the vulnerability particularly dangerous in enterprise environments where attackers may already have user-level access through various attack vectors such as phishing, remote desktop protocol exploitation, or other initial compromise techniques. The Windows Search Indexer service is typically enabled by default on most Windows installations, making this vulnerability widely exploitable across different system configurations. The vulnerability also presents challenges for detection and mitigation since the indexer service operates continuously in the background and processes legitimate indexing operations, making malicious manipulation less obvious to traditional security monitoring systems.
Mitigation strategies for CVE-2020-0627 should focus on both immediate patching and operational security measures. Microsoft released security updates in the May 2020 Patch Tuesday release that addressed this vulnerability, and organizations should prioritize applying these patches to all affected Windows systems. For environments where patching cannot be immediately implemented, administrators can consider disabling the Windows Search service through group policy or service configuration, though this may impact search functionality across the system. Network segmentation and access control measures should be implemented to limit initial access points that could lead to exploitation of this vulnerability. The vulnerability also highlights the importance of maintaining up-to-date security monitoring solutions that can detect unusual behavior patterns in system services, particularly those with elevated privileges. From an ATT&CK framework perspective, this vulnerability maps to T1068, which covers 'Exploitation for Privilege Escalation,' and T1059, which covers 'Command and Scripting Interpreter,' as exploitation typically involves leveraging system services to execute malicious code with elevated privileges. Organizations should also implement principle of least privilege configurations and regularly audit service configurations to minimize the attack surface for similar vulnerabilities in the future.