CVE-2019-0661 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-2019-0621, CVE-2019-0663.
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Analysis
by VulDB Data Team • 07/13/2024
The vulnerability identified as CVE-2019-0661 represents a critical information disclosure flaw within the Windows kernel component that enables unauthorized access to sensitive memory contents. This vulnerability specifically manifests when the kernel fails to properly manage object handling in memory, creating potential pathways for malicious actors to extract confidential data from system memory. The issue affects multiple Windows operating systems including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise and consumer environments. The vulnerability is categorized under CWE-200, which specifically addresses "Information Exposure," and aligns with the broader category of kernel-level information disclosure vulnerabilities that pose significant risks to system integrity and data confidentiality.
The technical exploitation of CVE-2019-0661 occurs through improper memory object handling within the Windows kernel, where the system fails to adequately validate or sanitize memory references during object operations. Attackers can leverage this flaw to perform memory reads that would normally be restricted, potentially accessing kernel memory regions containing sensitive information such as credentials, encryption keys, or other confidential data structures. The vulnerability stems from insufficient bounds checking and memory management controls within kernel components responsible for object lifecycle management. According to ATT&CK framework, this vulnerability maps to T1003.001 - "OS Credential Dumping: LSASS Memory" and T1059.001 - "Command and Scripting Interpreter: PowerShell" as attackers may use this information to escalate privileges or extract additional system credentials. The flaw is particularly dangerous because it operates at the kernel level, providing attackers with direct access to system memory without requiring elevated privileges.
The operational impact of CVE-2019-0661 extends beyond simple information disclosure, as the extracted memory contents can provide attackers with critical system information that facilitates further exploitation attempts. An attacker who successfully exploits this vulnerability could potentially access sensitive kernel data structures, including memory addresses, system configuration details, or even cryptographic material that could be used to bypass security controls. This information disclosure could enable more sophisticated attacks such as privilege escalation, credential theft, or even system compromise through subsequent exploitation vectors. The vulnerability's impact is compounded by its potential to be combined with other exploits, creating a multi-stage attack chain that could lead to complete system takeover. Organizations running affected Windows versions face significant risk of data breaches, insider threat exploitation, and potential compliance violations due to the exposure of confidential system information.
Mitigation strategies for CVE-2019-0661 primarily focus on applying Microsoft's security patches and updates as soon as they become available. The recommended approach includes immediate deployment of the relevant security updates from Microsoft's monthly release cycle, specifically targeting the Windows kernel memory management components. Network administrators should also implement monitoring solutions to detect anomalous memory access patterns that could indicate exploitation attempts. Additional defensive measures include implementing memory protection mechanisms such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) to make exploitation more difficult. Organizations should also consider implementing principle of least privilege controls, reducing the potential impact if exploitation occurs. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing comprehensive memory protection strategies as part of enterprise security frameworks. Regular security assessments and vulnerability scanning should be conducted to identify any potential exploitation attempts or related vulnerabilities that could compound the risk associated with CVE-2019-0661.