CVE-2020-17014 in Windows
Summary
by MITRE • 11/11/2020
Windows Print Spooler Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2020-17001.
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Analysis
by VulDB Data Team • 12/05/2020
The Windows Print Spooler Elevation of Privilege Vulnerability CVE-2020-17014 represents a critical security flaw in Microsoft Windows operating systems that allows local attackers to escalate their privileges from standard user level to SYSTEM level access. This vulnerability specifically affects the print spooler service which is responsible for managing print jobs and printer communications within the Windows environment. The flaw exists in the way the print spooler service handles certain operations during the processing of print jobs, creating an opportunity for malicious actors to exploit the service and gain elevated privileges. This vulnerability is particularly concerning because it can be exploited by attackers who already have a low-privilege user account on a target system, making it a significant vector for lateral movement and persistent access within network environments.
The technical implementation of this vulnerability stems from improper input validation and privilege handling within the Windows Print Spooler service. When a user submits a print job or interacts with printer management features, the spooler service processes these requests without adequate verification of the calling process's privileges. This allows a malicious user to craft specific print job parameters or printer driver installations that can trigger code execution with elevated privileges. The flaw is classified under CWE-264, which addresses permissions, privileges, and access control issues, specifically focusing on inadequate privilege management during service operations. Attackers can leverage this vulnerability by installing malicious printer drivers or by manipulating print job processing flows to execute arbitrary code with SYSTEM privileges, effectively bypassing standard Windows security controls.
The operational impact of CVE-2020-17014 extends beyond simple privilege escalation, as it provides attackers with complete control over affected systems. Once an attacker successfully exploits this vulnerability, they can access all system resources, modify or delete critical files, install malware, and establish persistent backdoors. The vulnerability is particularly dangerous in enterprise environments where multiple users share systems and where print servers are commonly used to manage network printing. Organizations may experience significant security breaches when attackers use this exploit to move laterally across networks, as print servers often have elevated permissions and can provide access to sensitive network resources. The vulnerability also impacts the principle of least privilege, as it allows attackers to bypass normal access controls and gain unauthorized system-level access.
Mitigation strategies for CVE-2020-17014 should include immediate implementation of Microsoft security patches released in the October 2020 security updates. Organizations should also implement network segmentation to limit access to print servers and reduce the attack surface. Disabling the print spooler service where it is not required, or restricting printer driver installation privileges, can significantly reduce the risk of exploitation. Security monitoring should focus on detecting unusual print job processing patterns or unauthorized driver installations. Additionally, implementing the principle of least privilege for user accounts and regularly auditing print server configurations can help prevent exploitation. The ATT&CK framework categorizes this vulnerability under T1068, which covers 'Exploitation for Privilege Escalation', and T1059, which covers 'Command and Scripting Interpreter', as attackers may use the elevated privileges to execute additional malicious commands and establish persistence within the compromised environment.