CVE-2020-17044 in Windows
Summary
by MITRE • 11/11/2020
Windows Remote Access Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2020-17025, CVE-2020-17026, CVE-2020-17027, CVE-2020-17028, CVE-2020-17031, CVE-2020-17032, CVE-2020-17033, CVE-2020-17034, CVE-2020-17043, CVE-2020-17055.
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Analysis
by VulDB Data Team • 12/05/2020
This vulnerability resides within the Windows Remote Access service component and represents a critical elevation of privilege flaw that allows attackers to escalate their access privileges from a standard user account to system-level administrative rights. The vulnerability specifically affects the Windows Remote Access service implementation where improper validation of user credentials and access controls creates an exploitable condition that bypasses normal security boundaries. The flaw manifests in the way the service processes authentication requests and handles privilege assignment during remote access sessions, creating a pathway for unauthorized privilege escalation without requiring additional malicious code execution.
The technical root cause of CVE-2020-17044 stems from insufficient input validation within the Windows Remote Access service authentication mechanism. When legitimate users establish remote connections through the service, the system fails to properly verify the integrity of authentication tokens or session identifiers, allowing crafted malicious inputs to manipulate the privilege assignment process. This vulnerability operates at the kernel level within the Windows operating system, specifically within the Remote Access service subsystem that manages network connectivity and user access control. The flaw enables attackers to exploit the service's trust model by manipulating authentication parameters that should normally be validated against established security policies.
From an operational perspective, this vulnerability presents a severe risk to enterprise environments where Windows systems are exposed to external networks or where remote access services are enabled. Attackers can leverage this flaw to gain system-level privileges without requiring prior access credentials, effectively bypassing traditional authentication mechanisms and security controls. The vulnerability is particularly dangerous because it can be exploited remotely without requiring any specialized tools beyond standard network reconnaissance capabilities. Organizations with active remote access services, VPN implementations, or systems that allow remote desktop connections are at heightened risk, as the attack surface expands to include any system running vulnerable Windows versions.
The impact of this vulnerability extends beyond simple privilege escalation to include potential data exfiltration, system compromise, and lateral movement within network environments. Once attackers achieve system-level privileges through this vulnerability, they can modify system files, install persistent backdoors, access sensitive data, and establish footholds for further infiltration. The vulnerability aligns with attack patterns documented in the MITRE ATT&CK framework under the privilege escalation category, specifically targeting techniques that exploit service misconfigurations and authentication bypass mechanisms. Security researchers have noted that this vulnerability demonstrates characteristics consistent with CWE-284, which addresses improper access control, and CWE-250, which covers execution with unnecessary privileges, making it particularly dangerous in enterprise environments.
Organizations should implement immediate mitigations including applying Microsoft security patches, disabling unnecessary remote access services, and implementing network segmentation to limit exposure. The vulnerability requires careful monitoring of remote access service logs and authentication patterns to detect potential exploitation attempts. Security teams should also consider implementing additional access controls and privilege management policies to reduce the impact if exploitation occurs. Network administrators should review and restrict access to remote services, particularly those that are not essential for business operations, while ensuring that all Windows systems receive timely security updates from Microsoft. The remediation process should include comprehensive testing of patched systems to ensure that the vulnerability is fully resolved without introducing compatibility issues with existing applications or services.