CVE-2020-1241 in Windows
Summary
by MITRE
A security feature bypass vulnerability exists when Windows Kernel fails to properly sanitize certain parameters.To exploit the vulnerability, a locally-authenticated attacker could attempt to run a specially crafted application on a targeted system.The update addresses the vulnerability by correcting how Windows Kernel handles parameter sanitization., aka 'Windows Kernel Security Feature Bypass Vulnerability'.
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Analysis
by VulDB Data Team • 10/23/2020
This vulnerability represents a critical security feature bypass in the Windows kernel that stems from inadequate parameter sanitization during kernel operations. The flaw allows a locally authenticated attacker to circumvent kernel-level security controls by exploiting how the kernel processes certain input parameters. The vulnerability specifically manifests when the kernel fails to properly validate or sanitize input data that flows through kernel execution paths, creating potential entry points for privilege escalation or bypass of kernel security mechanisms.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and CWE-119, which addresses insufficient resource management. The attack vector requires local authentication since the exploit targets kernel-level operations that are typically accessible only to authenticated users. However, the security implications extend beyond simple local access as the vulnerability could potentially enable attackers to elevate privileges or disable kernel security features. The kernel sanitization failure creates a condition where malicious parameters can be passed through kernel APIs without proper validation, allowing attackers to manipulate kernel behavior.
From an operational perspective, this vulnerability poses significant risk to Windows systems as it undermines fundamental kernel security controls that protect against malicious code execution and privilege escalation. The impact is particularly concerning because kernel-level bypasses often provide attackers with extensive system access and the ability to manipulate core operating system functions. Attackers could potentially use this vulnerability to disable security features, escalate privileges to SYSTEM level, or gain access to protected kernel memory regions. The vulnerability's exploitation requires local system access but can result in complete system compromise, making it a high-value target for attackers seeking persistent access.
The remediation approach involves Microsoft addressing the parameter sanitization logic within the Windows kernel through a security update that corrects how kernel components handle input validation. Organizations should prioritize deployment of the relevant security patches as soon as possible to mitigate the risk. System administrators should also implement additional monitoring for unusual kernel activity and parameter usage patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation at all levels of system execution, including kernel space, where security failures can result in complete system compromise. Security controls should include regular patch management processes and kernel integrity monitoring to detect potential exploitation attempts.