CVE-2017-8702 in Windows
Summary
by MITRE
Windows Error Reporting (WER) in Microsoft Windows 10 Gold, 1511, and 1607, and Windows Server 2016 allows an attacker to gain greater access to sensitive information and system functionality, due to the way that WER handles and executes files, aka "Windows Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 10/07/2024
The Windows Error Reporting component in Microsoft Windows operating systems presents a critical elevation of privilege vulnerability that affects multiple versions including Windows 10 Gold, 1511, and 1607, along with Windows Server 2016. This vulnerability stems from improper handling of files within the Windows Error Reporting framework, creating an exploitable condition that allows attackers to escalate their privileges and gain unauthorized access to system resources. The flaw specifically manifests in how WER processes and executes files, enabling malicious actors to leverage this mechanism for privilege escalation attacks. The vulnerability represents a significant security concern as it directly impacts the operating system's integrity and access controls, potentially allowing attackers to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability involves the Windows Error Reporting service's improper validation and execution of potentially malicious files within its processing pipeline. When WER handles error reports or crash information, it may inadvertently execute files with elevated privileges, creating a pathway for attackers to exploit the system's trust model. This issue falls under the CWE-264 category of Permissions, Privileges, and Access Controls, specifically addressing the improper handling of privilege escalation opportunities. The vulnerability can be exploited through various attack vectors including crafted error reports, malicious crash dumps, or manipulated system files that WER processes during normal operation. The underlying flaw demonstrates a failure in the principle of least privilege, where system components execute code with unnecessary elevated permissions.
The operational impact of this vulnerability extends beyond simple privilege escalation, potentially allowing attackers to access sensitive system information, modify critical system files, and establish persistent access to affected systems. Attackers can leverage this vulnerability to bypass standard security controls and gain access to system functionality that should be restricted to authorized users or system processes. The exploitation of this vulnerability can lead to complete system compromise, data exfiltration, and the establishment of backdoors or persistent malware installations. Organizations running affected Windows versions face significant risk as this vulnerability can be exploited remotely without requiring user interaction, making it particularly dangerous in enterprise environments where multiple systems may be vulnerable.
Mitigation strategies for this vulnerability include immediate installation of Microsoft security updates and patches that address the specific WER handling mechanisms. System administrators should implement the principle of least privilege by restricting WER's access to system resources and monitoring error reporting activities for suspicious behavior. Network segmentation and monitoring solutions should be deployed to detect unusual WER activity or file execution patterns that may indicate exploitation attempts. Organizations should also consider disabling unnecessary WER functionality where possible and implementing additional security controls such as application whitelisting to prevent unauthorized code execution. The vulnerability aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation" and demonstrates how operating system components can be leveraged for unauthorized access. Regular security assessments and vulnerability scanning should be conducted to identify systems that may still be running affected versions without proper patching, as this vulnerability remains relevant for legacy systems that have not received updates.