CVE-2020-1235 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-2020-1231, CVE-2020-1233, CVE-2020-1265, CVE-2020-1282, CVE-2020-1304, CVE-2020-1306, CVE-2020-1334.
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Analysis
by VulDB Data Team • 10/23/2020
The Windows Runtime Elevation of Privilege Vulnerability represents a critical security flaw in Microsoft Windows operating systems that allows attackers to escalate their privileges from standard user level to system level execution. This vulnerability specifically affects how the Windows Runtime component handles memory objects, creating an opportunity for malicious actors to exploit improper object management practices within the operating system's core infrastructure. The vulnerability exists in the Windows Runtime environment which serves as a foundational component for modern applications and system services, making it particularly dangerous as it can be leveraged across multiple attack vectors.
The technical root cause of this vulnerability stems from improper handling of objects in memory within the Windows Runtime subsystem. When Windows Runtime processes application objects, it fails to adequately validate or sanitize memory references, potentially allowing attackers to manipulate object pointers or memory structures to execute arbitrary code with elevated privileges. This flaw falls under the category of memory corruption vulnerabilities and aligns with CWE-125, which describes out-of-bounds read conditions that can lead to privilege escalation. The vulnerability manifests when legitimate applications or system processes interact with improperly managed runtime objects, creating opportunities for attackers to craft malicious inputs that trigger the privilege escalation behavior.
From an operational impact perspective, this vulnerability presents significant risk to enterprise environments and individual users alike. Attackers who successfully exploit this vulnerability can gain system-level privileges without requiring authentication, effectively bypassing standard security controls and access restrictions. The attack surface is broad as it affects applications built on Windows Runtime, which includes both traditional desktop applications and modern universal Windows platform applications. This vulnerability enables attackers to perform actions such as installing malware, modifying system files, accessing sensitive data, and creating persistent backdoors within the compromised system. The exploitation typically requires minimal user interaction beyond initial access, making it particularly dangerous in targeted attacks or when combined with other vulnerabilities.
The mitigation strategies for this vulnerability involve multiple layers of defensive measures including immediate patching of affected systems, implementation of application whitelisting policies, and enhanced monitoring of system processes. Microsoft released security updates that address this specific memory handling issue within the Windows Runtime component, requiring organizations to deploy these patches promptly across all affected systems. Additionally, implementing least privilege principles can reduce the potential impact of exploitation, while network segmentation and behavioral monitoring can help detect anomalous activities that may indicate exploitation attempts. The vulnerability demonstrates the importance of proper memory management practices and aligns with ATT&CK technique T1068, which covers local privilege escalation through the exploitation of system vulnerabilities. Organizations should also consider implementing runtime application protection mechanisms and regular security assessments to identify similar memory corruption vulnerabilities that may exist in other system components.