CVE-2020-0707 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows IME improperly handles memory.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Windows IME Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 03/29/2024
The Windows IME elevation of privilege vulnerability represents a critical security flaw in the Input Method Editor component of Microsoft Windows operating systems. This vulnerability falls under the category of memory handling errors that can be exploited to escalate privileges from a standard user account to system-level access. The issue stems from improper memory management within the IME subsystem, which processes input from various keyboard layouts and language systems. The vulnerability exists in how the IME component handles memory allocation and deallocation during input processing operations, creating potential attack surfaces for malicious code execution.
The technical exploitation of this vulnerability requires an attacker to first establish a foothold on the target system through initial compromise methods. Once execution is achieved, the attacker can leverage the memory handling flaw in the IME component to execute arbitrary code with elevated privileges. The vulnerability is particularly dangerous because it allows privilege escalation without requiring additional authentication or system access. According to CWE classification, this represents a weakness in memory management where improper handling of memory objects leads to security consequences. The attack vector typically involves crafting malicious input that triggers the vulnerable memory handling code path within the IME subsystem, potentially leading to full system compromise.
The operational impact of CVE-2020-0707 extends beyond simple privilege escalation as it provides attackers with persistent access to system resources and data. This vulnerability enables adversaries to bypass standard security controls and access sensitive system files, registry keys, and network resources. The risk is compounded by the fact that IME components are frequently used during normal system operation, making the attack surface more accessible. Organizations using affected Windows versions face significant exposure since the vulnerability can be exploited through various attack vectors including malicious documents, web-based attacks, or social engineering campaigns. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically leveraging Windows management instrumentation and input method editor components to gain elevated system access.
Mitigation strategies for this vulnerability primarily involve applying Microsoft security patches and updates as soon as they become available. System administrators should prioritize patch management processes to ensure all Windows systems receive the necessary security fixes. Additional protective measures include implementing application whitelisting policies, restricting user privileges, and monitoring system logs for suspicious IME-related activities. Network segmentation and endpoint detection systems can help identify potential exploitation attempts. Organizations should also consider disabling unnecessary IME functionality when not required and implementing security awareness training to reduce the risk of initial compromise through phishing or malicious file execution. The vulnerability highlights the importance of secure coding practices in system components and the need for regular security assessments of core operating system functions.