CVE-2017-8633 in Windows
Summary
by MITRE
Windows Error Reporting (WER) in Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability, aka "Windows Error Reporting Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 01/07/2021
The Windows Error Reporting component represents a critical security vulnerability that affects multiple Windows operating systems including server and client versions. This vulnerability resides within the Windows Error Reporting subsystem which is designed to collect and submit diagnostic information about system crashes and errors to Microsoft for analysis and improvement of the operating system. The flaw specifically enables an elevation of privilege attack that allows malicious actors to escalate their privileges from standard user level to administrative rights, potentially compromising entire systems. The vulnerability affects Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016, demonstrating the widespread impact across the Windows ecosystem.
Technical exploitation of this vulnerability occurs through improper handling of error reporting processes that allows privilege escalation. The flaw stems from insufficient validation and access control mechanisms within the Windows Error Reporting service, which typically operates with elevated privileges to properly collect system crash information. Attackers can manipulate the error reporting process to execute malicious code with higher privileges than originally intended. This vulnerability aligns with CWE-276, which describes improper privilege management, and represents a classic example of how system components designed for diagnostic purposes can be abused for privilege escalation attacks. The vulnerability's exploitation typically involves crafting specific error conditions or manipulating error reporting files that would normally be handled by the system with appropriate security controls in place.
The operational impact of this vulnerability is severe and far-reaching across enterprise and individual computing environments. Once successfully exploited, attackers can gain administrative privileges on affected systems, enabling them to install malware, modify system files, create new user accounts, access sensitive data, and establish persistent access to compromised networks. The vulnerability's presence in both server and client operating systems means that organizations face risk across their entire infrastructure, from desktop computers to critical server environments. The attack vector often involves social engineering or exploitation of other vulnerabilities to initially gain a foothold, followed by privilege escalation through the WER vulnerability. This creates a dangerous scenario where attackers can move laterally through networks and escalate their access to critical system resources.
Mitigation strategies for this vulnerability require immediate patch deployment from Microsoft as the primary defense mechanism, with the specific update addressing the privilege escalation flaw in Windows Error Reporting. Organizations should implement additional security measures including disabling unnecessary error reporting functionality where possible, monitoring for suspicious error reporting activities, and ensuring proper access controls are in place for system directories and registry keys related to error reporting. Security teams should also consider implementing endpoint detection and response solutions that can identify unusual privilege escalation patterns or suspicious error reporting activities. The vulnerability's classification under ATT&CK technique T1068, privilege escalation, indicates that defensive measures should include monitoring for privilege escalation attempts and implementing principle of least privilege access controls. Regular security assessments and vulnerability scanning should be conducted to ensure all affected systems receive the necessary patches and that the environment remains secure against similar privilege escalation threats.