CVE-2020-1157 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Runtime improperly handles objects in memory, aka 'Windows Runtime Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1077, CVE-2020-1086, CVE-2020-1090, CVE-2020-1125, CVE-2020-1139, CVE-2020-1149, CVE-2020-1151, CVE-2020-1155, CVE-2020-1156, CVE-2020-1158, CVE-2020-1164.
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Analysis
by VulDB Data Team • 10/17/2020
The Windows Runtime Elevation of Privilege Vulnerability identified as CVE-2020-1157 represents a critical security flaw within the Windows operating system's runtime environment that allows malicious actors to escalate their privileges from standard user level to administrative rights. This vulnerability specifically targets the improper handling of objects in memory by the Windows Runtime component, which serves as a foundational framework for modern Windows applications and system services. The flaw exists in how the runtime manages memory objects during application execution, creating potential attack vectors that could be exploited by adversaries to gain unauthorized elevated privileges. The vulnerability is particularly concerning because it affects the core Windows Runtime infrastructure that powers numerous applications and system components across different Windows versions including Windows 10 and Windows Server 2019.
The technical nature of this vulnerability stems from memory management flaws within the Windows Runtime subsystem where objects are not properly validated or sanitized before being processed in memory. When applications interact with the Windows Runtime, they pass objects containing data structures that should be carefully validated to prevent malicious manipulation. However, the vulnerability allows attackers to craft specially crafted objects that, when processed by the runtime, can cause memory corruption or improper object handling that leads to privilege escalation. This issue manifests as a failure in the runtime's object lifecycle management, where memory objects that should be properly disposed or validated are instead manipulated to execute code with elevated privileges. The vulnerability falls under CWE-119 which describes weaknesses in memory management, specifically improper handling of memory objects. According to the ATT&CK framework, this vulnerability maps to privilege escalation techniques where adversaries leverage system-level flaws to gain higher-level access rights, making it a significant concern for enterprise security.
The operational impact of CVE-2020-1157 extends beyond simple privilege escalation as it provides attackers with the ability to compromise entire systems and potentially establish persistent access. Once an attacker successfully exploits this vulnerability, they can execute arbitrary code with system-level privileges, enabling them to install malware, modify system files, access sensitive data, and potentially move laterally within network environments. The vulnerability affects a broad range of Windows applications that rely on the Windows Runtime, making it particularly dangerous in enterprise environments where numerous applications may be vulnerable. Attackers can exploit this weakness through various vectors including malicious applications, compromised websites, or even through social engineering tactics that trick users into executing malicious code. The vulnerability's impact is amplified because it requires minimal user interaction for exploitation, often allowing attackers to gain system-level access simply by running an application that triggers the flawed memory handling routine.
Organizations should implement immediate mitigations including applying the relevant Microsoft security patches that address the Windows Runtime memory handling flaws. System administrators should prioritize patch deployment across all affected Windows systems, particularly those running Windows 10 and Windows Server 2019 environments. Additional defensive measures include implementing application whitelisting policies to restrict execution of unauthorized applications that might exploit the vulnerability, monitoring for unusual privilege escalation activities, and conducting regular security assessments of Windows Runtime dependent applications. Network segmentation and privilege separation can help limit the potential damage if exploitation occurs, while endpoint detection and response solutions should be configured to monitor for suspicious memory manipulation patterns. The vulnerability's classification as a privilege escalation issue means that organizations should also review their existing access control policies and ensure that users have the minimum necessary privileges to perform their functions, reducing the potential impact of successful exploitation. Microsoft recommends that organizations deploy the security updates as soon as possible and maintain continuous monitoring of their systems for any signs of exploitation attempts targeting this specific vulnerability.