CVE-2024-21340 in Windows
Summary
by MITRE • 02/13/2024
Windows Kernel Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 03/04/2024
This vulnerability represents a critical information disclosure flaw within the windows kernel component that allows attackers to extract sensitive system data through improper access controls and memory management flaws. The issue stems from inadequate validation of kernel-mode operations that permit unauthorized access to kernel memory regions containing confidential information such as system handles, process identifiers, and security credentials. The vulnerability manifests when legitimate kernel functions fail to properly enforce access restrictions, enabling malicious code or unprivileged users to query kernel data structures through crafted system calls or direct memory access attempts.
The technical implementation of this flaw typically involves exploiting weaknesses in the windows kernel's object manager or system call interface where insufficient parameter validation allows attackers to bypass normal security boundaries. When processes attempt to access kernel objects without proper authorization, the system fails to properly validate the requesting entity's privileges, leading to information leakage through mechanisms such as handle enumeration, process listing, or memory dump operations. This type of vulnerability directly relates to common weakness enumerations including cwe 200 information exposure and cwe 264 permissions, privileges, and access controls, where inadequate protection mechanisms allow unauthorized data access.
The operational impact of this vulnerability extends significantly beyond simple information disclosure, as the leaked kernel data can enable attackers to conduct more sophisticated attacks such as privilege escalation, process injection, or targeted exploitation of other system components. Attackers can leverage the disclosed information to craft more effective attack vectors by identifying running processes, examining system handles, or mapping kernel memory layouts that would otherwise remain hidden from normal system access. This information leakage creates opportunities for advanced persistent threats and can facilitate lateral movement within networks where attackers use the gathered intelligence to identify potential targets and plan subsequent exploitation phases.
Mitigation strategies must address both immediate protection measures and long-term architectural improvements to prevent similar vulnerabilities from emerging in future system versions. System administrators should implement comprehensive monitoring solutions that detect unusual kernel access patterns or unauthorized information queries, while also applying timely security patches provided by microsoft to address known vulnerabilities in kernel components. The implementation of kernel mode exploit protection features such as control flow guard, virtualization-based security, and address space layout randomization can significantly reduce the effectiveness of exploitation attempts. Organizations should also consider implementing principle of least privilege controls and regular security assessments that specifically target kernel-level access controls to identify potential information disclosure risks before they can be exploited by malicious actors.
The vulnerability demonstrates clear connections to several attack techniques documented in the attack tree framework, particularly those involving credential access and privilege escalation phases. Attackers can leverage this information disclosure to build more effective exploitation payloads or conduct reconnaissance activities that would otherwise require more time-consuming manual enumeration processes. This type of vulnerability often serves as a stepping stone for attackers to progress through different stages of the attack lifecycle, moving from initial access through to persistence and data exfiltration operations. Organizations must recognize that kernel-level information disclosure vulnerabilities represent some of the most dangerous security flaws due to their potential to enable complete system compromise and the difficulty in detecting their exploitation.
Security professionals should maintain awareness of emerging threats related to kernel exploitation techniques and ensure that monitoring systems are capable of identifying anomalous behavior patterns that may indicate successful exploitation attempts. Regular updates to security tooling and defensive measures must account for evolving attack methods that target kernel-level vulnerabilities, while also ensuring that system administrators understand the implications of information disclosure risks within their environments. The complexity of modern operating systems means that kernel vulnerabilities often have cascading effects that can influence multiple security controls throughout the system architecture, making comprehensive vulnerability management essential for maintaining effective defenses against sophisticated threats.