CVE-2020-1589 in Windows
Summary
by MITRE
<p>An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system.</p> <p>To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application. The vulnerability would not allow an attacker to execute code or to elevate user rights directly, but it could be used to obtain information that could be used to try to further compromise the affected system.</p> <p>The update addresses the vulnerability by correcting how the Windows kernel handles objects in memory.</p>
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Analysis
by VulDB Data Team • 02/24/2026
This vulnerability represents a critical information disclosure flaw within the Windows kernel's memory management subsystem, classified under the Common Weakness Enumeration framework as CWE-200 Information Exposure. The vulnerability arises from improper handling of kernel objects in memory, creating an information leakage channel that could be exploited by malicious actors with local system access. The flaw specifically manifests when the kernel fails to properly validate or sanitize memory objects during processing, potentially exposing sensitive kernel data structures or memory contents to unauthorized access. This type of vulnerability falls under the ATT&CK technique T1003.002 Credential Dumping: LSASS Memory, as it enables information gathering that could lead to privilege escalation or further system compromise.
The exploitation scenario requires an attacker to possess legitimate user credentials and execute a specially crafted application on the target system, making this a local privilege escalation vector rather than a remote attack. The vulnerability does not directly enable code execution or privilege elevation, but instead provides attackers with valuable information that could be leveraged in subsequent attack phases. This information disclosure could reveal kernel memory addresses, object structures, or other sensitive data that would aid in developing more sophisticated attacks against the system. The attack vector specifically targets the kernel's memory management functions, where improper object handling creates potential information leaks through mechanisms such as memory corruption or information leakage during object manipulation.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the building blocks for more advanced exploitation techniques. The leaked information could be used to bypass security mechanisms, predict memory layouts, or identify system vulnerabilities that could be exploited in combination with other attack vectors. Attackers might use the disclosed information to craft more effective buffer overflow exploits, or to understand the target system's memory organization for advanced persistence techniques. The vulnerability's nature as a kernel-level information leak means that successful exploitation could potentially expose sensitive system internals that would normally be protected from user-space access, fundamentally weakening the system's security posture.
Microsoft's patch addresses this vulnerability by implementing proper memory object validation and sanitization within the kernel's memory management routines. The update corrects the improper handling of kernel objects in memory by introducing additional checks and controls that prevent unauthorized information disclosure during object processing. This remediation aligns with security best practices for kernel-level programming and follows the principle of least privilege by ensuring that kernel objects are properly isolated and validated before any information can be exposed. Organizations should prioritize deployment of this update as part of their vulnerability management processes, particularly in environments where local access controls may be compromised or where systems handle sensitive data. The patch demonstrates the importance of proper kernel memory management practices and reinforces the need for continuous security auditing of core system components to prevent information leakage vulnerabilities that could enable more serious attacks.