CVE-2019-0621 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory, aka 'Windows Kernel Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0661, CVE-2019-0663.
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Analysis
by VulDB Data Team • 05/13/2020
The vulnerability described in CVE-2019-0621 represents a critical information disclosure flaw within the Windows kernel operating system component. This issue arises from improper handling of memory objects by the kernel, creating potential avenues for unauthorized data exposure. The vulnerability specifically affects the kernel's memory management functions, where objects are not correctly processed or validated during memory operations. Such improper object handling can lead to sensitive information being inadvertently exposed to unauthorized processes or users within the system. The flaw exists at the core operating system level, making it particularly dangerous as it operates below the user application layer where typical security controls might be bypassed. This type of vulnerability falls under the category of kernel-level information disclosure, where the attacker can potentially access memory contents that should remain protected.
The technical exploitation of this vulnerability occurs when malicious code or processes interact with kernel objects that are improperly managed during memory allocation, deallocation, or access operations. The Windows kernel's memory management subsystem fails to properly validate or sanitize object references, potentially allowing attackers to read kernel memory contents that contain sensitive data such as encryption keys, credential information, or other confidential system data. This improper handling can manifest through various kernel APIs or system calls that manage memory objects, where the vulnerability is triggered by specific memory access patterns or object manipulation sequences. The flaw typically requires minimal privileges to exploit, often allowing a local attacker with basic user rights to gain access to kernel memory spaces that should remain protected.
The operational impact of CVE-2019-0621 extends beyond simple information disclosure, as it can potentially enable more sophisticated attacks such as privilege escalation or system compromise. Attackers who successfully exploit this vulnerability can extract sensitive information that may include system credentials, encryption keys, or other confidential data stored in kernel memory. This information can then be leveraged to conduct further attacks including lateral movement within networks, credential theft, or system takeover operations. The vulnerability creates a persistent threat vector that can be exploited across multiple Windows versions and configurations, making it particularly concerning for enterprise environments where system stability and security are paramount. Organizations may experience cascading security issues as compromised systems can serve as launching points for broader attacks against network infrastructure.
Mitigation strategies for CVE-2019-0621 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vulnerability has been addressed in subsequent Windows updates. System administrators should implement comprehensive monitoring of kernel memory access patterns and unusual system behavior that might indicate exploitation attempts. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs, while endpoint detection and response solutions should be configured to identify suspicious memory access patterns. The vulnerability aligns with CWE-200, which addresses "Information Exposure," and may be linked to ATT&CK techniques involving privilege escalation and credential access. Regular security assessments and vulnerability scanning should include checks for proper kernel memory management, and organizations should maintain updated security baselines that include kernel integrity validation measures. Additionally, implementing application whitelisting and runtime protection mechanisms can provide additional defense layers against exploitation attempts targeting this specific memory management flaw.