CVE-2020-1075 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when Windows Subsystem for Linux improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system. A attacker could exploit this vulnerability by running a specially crafted application. The update addresses the vulnerability by correcting how Windows Subsystem for Linux handles objects in memory.
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Analysis
by VulDB Data Team • 08/20/2026
The Windows Subsystem for Linux (WSL) represents a significant architectural component that enables Linux binary compatibility on Windows systems, allowing users to run Linux distributions alongside Windows applications. This subsystem operates through a translation layer that facilitates communication between Windows and Linux environments, creating a complex interaction model that introduces potential security vectors. The vulnerability in question manifests within the memory management handling mechanisms of WSL, specifically when the subsystem processes objects in memory without proper validation or isolation controls. This information disclosure vulnerability stems from insufficient boundary checks and memory handling procedures that allow unauthorized access to sensitive data structures and potentially confidential information that should remain isolated within the Linux subsystem environment.
The technical flaw within WSL's memory handling occurs when the subsystem fails to properly validate object references during memory operations, creating opportunities for information leakage through improper memory access patterns. This vulnerability specifically affects how WSL manages object lifecycles and memory allocation when transitioning between Windows and Linux contexts. The flaw enables an attacker to potentially access memory locations that contain sensitive data from other processes or system components, effectively bypassing the isolation mechanisms that should protect the Linux subsystem from Windows-level access. According to CWE classification, this vulnerability maps to CWE-200, which covers "Information Exposure," and more specifically to CWE-254, "Weaknesses that Affect Memory," indicating the memory management failure that enables the information disclosure. The vulnerability exists at the intersection of kernel-level memory management and user-space application interfaces, where improper object handling creates data exposure pathways.
The operational impact of this information disclosure vulnerability extends beyond simple data leakage, as it can potentially enable more sophisticated attacks by providing attackers with insights into system memory structures, process information, and potentially sensitive configuration data. An attacker with local access to a Windows system with WSL enabled could exploit this vulnerability to gather information about running processes, memory layouts, and system states that would normally be protected by proper isolation mechanisms. This information could then be leveraged to craft more targeted attacks against other system components or to facilitate privilege escalation attempts. The vulnerability affects all versions of WSL that implement the memory handling mechanisms described, creating a persistent risk for systems that have WSL installed and active. According to ATT&CK framework, this vulnerability maps to T1082 "System Information Discovery" and T1005 "Data from Local System," indicating the reconnaissance and information gathering capabilities that this vulnerability enables.
Mitigation strategies for this vulnerability require immediate patch application from Microsoft, as the fix typically involves correcting memory handling procedures and implementing proper validation of object references within the WSL subsystem. System administrators should ensure that all Windows systems with WSL enabled receive the relevant security updates as soon as they become available, particularly given the local access requirements for exploitation. Additionally, organizations should consider implementing network segmentation and access controls to limit local system access where WSL is present, as this reduces the attack surface for potential exploitation. The vulnerability demonstrates the importance of proper memory management in hybrid operating system environments and highlights the need for comprehensive security testing of subsystem components that bridge different operating system contexts. Regular security assessments should include evaluation of subsystem memory handling, particularly focusing on object lifecycle management and proper isolation mechanisms between different system components. Organizations should also maintain awareness of similar vulnerabilities in other cross-platform compatibility layers and ensure that security patches are applied consistently across all affected systems.