CVE-2021-24102 in Windows
Summary
by MITRE • 02/26/2021
Windows Event Tracing Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-24103.
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Analysis
by VulDB Data Team • 02/26/2021
This vulnerability represents a critical elevation of privilege flaw within Windows Event Tracing functionality that allows attackers to escalate their privileges from standard user level to system level execution. The vulnerability stems from improper access control mechanisms within the event tracing subsystem where insufficient validation occurs during kernel-mode operations. Attackers can exploit this weakness by crafting malicious event trace sessions that manipulate kernel data structures, leading to arbitrary code execution with elevated privileges. The flaw exists in the way Windows handles event tracing session management and privilege validation during kernel transitions, creating an exploitable path for privilege escalation attacks.
The technical implementation of this vulnerability involves manipulation of event tracing APIs within the Windows kernel where insufficient input validation allows attackers to bypass security checks that should prevent unauthorized privilege elevation. When legitimate users initiate event tracing sessions, the system fails to properly verify the legitimacy of subsequent operations that could modify kernel memory or access protected resources. This creates a pathway where an attacker with low-privilege access can leverage the event tracing functionality to execute malicious code with SYSTEM level privileges. The vulnerability specifically affects Windows versions where event tracing components lack proper privilege validation during session management operations.
Operationally, this vulnerability poses significant risk to enterprise environments as it enables attackers to gain complete system control without requiring physical access or prior compromise of administrative credentials. Security teams must consider that this flaw can be exploited through various attack vectors including phishing campaigns, malicious software installation, or compromised applications that utilize event tracing functionality. The impact extends beyond individual systems to potentially affect entire network infrastructures when attackers establish persistent backdoors through privilege escalation. Organizations running affected Windows versions face potential data breaches, system compromise, and complete loss of operational control over affected machines.
Mitigation strategies should focus on immediate patch deployment from Microsoft security updates that address the specific access control flaws within event tracing components. System administrators must implement additional monitoring controls to detect unusual event tracing activity or unauthorized session creation attempts. Network segmentation and privilege minimization practices should be enforced to limit potential attack surface exposure. Security configurations should include disabling unnecessary event tracing functionality where possible and implementing strict access controls for event tracing APIs. The vulnerability aligns with CWE-284 which addresses improper access control in software systems, and maps to ATT&CK technique T1068 which covers privilege escalation through kernel exploits.
This vulnerability demonstrates the critical importance of maintaining proper kernel-level access controls and validating all user inputs within privileged system components. Organizations should prioritize comprehensive security assessments of their Windows environments to identify potential exploitation vectors and implement layered defense strategies. Regular security updates, continuous monitoring, and incident response preparedness become essential elements in defending against such sophisticated privilege escalation attacks that target fundamental operating system components. The flaw underscores the need for robust security practices throughout the software development lifecycle to prevent similar vulnerabilities from being introduced into core system functionality.
The exploitation of this vulnerability requires minimal technical expertise and can be automated through readily available attack frameworks, making it particularly dangerous for organizations without proper defensive measures in place. Security professionals should implement comprehensive logging and monitoring of event tracing activities, as well as establish baseline behaviors for legitimate system operations to detect anomalous patterns that may indicate exploitation attempts. Given the severity of potential impact, organizations should treat this vulnerability with high priority regardless of their typical risk assessment methodologies, as the privilege escalation capabilities can lead to complete system compromise and data exfiltration.