CVE-2020-1366 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Print Workflow Service improperly handles objects in memory, aka 'Windows Print Workflow Service Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/30/2020
The Windows Print Workflow Service elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows environments. This vulnerability specifically affects the print workflow service component that manages print job processing and communication between applications and printers. The issue stems from improper handling of memory objects within the service, creating a pathway for malicious actors to gain elevated system privileges. Security researchers identified this weakness during routine vulnerability assessments of Windows operating systems, highlighting the service's inadequate validation of memory operations during print job processing.
The technical exploitation of this vulnerability occurs when the Windows Print Workflow Service processes print jobs that contain specially crafted malicious objects in memory. The service fails to properly validate or sanitize these memory objects, allowing an attacker to manipulate the service's execution flow and potentially execute arbitrary code with higher privileges than initially granted. This memory handling flaw typically manifests when print jobs are submitted through applications that interface with the print workflow service, particularly when these jobs contain malformed or unexpected data structures. The vulnerability exists at the kernel level processing within the print service, making it particularly dangerous as it operates with elevated privileges that are normally restricted to system processes.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to establish persistent access to affected systems. Once exploited, the vulnerability allows adversaries to execute malicious code with system-level privileges, potentially leading to complete system compromise. Attackers can leverage this weakness to install backdoors, modify system files, access sensitive data, or deploy additional malware. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, making it a widespread concern for enterprise environments. Organizations running print servers or systems with active print workflows are particularly at risk, as the attack surface expands to include any system that processes print jobs through the affected service.
Mitigation strategies for this vulnerability should include immediate application of Microsoft security patches released in the corresponding security update. System administrators should ensure all Windows systems are updated to the latest security patches, particularly focusing on the print workflow service components. Network segmentation and access controls should be implemented to limit exposure of print services to untrusted networks. Regular monitoring of print job submissions and system logs can help detect anomalous behavior indicative of exploitation attempts. Organizations should also implement principle of least privilege configurations, ensuring that print services operate with minimal required permissions. The vulnerability aligns with CWE-121 which addresses stack-based buffer overflow conditions, and maps to ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation'. Security teams should conduct regular vulnerability assessments and penetration testing to identify potential exploitation vectors and ensure comprehensive protection against similar memory handling vulnerabilities.