CVE-2020-17007 in Windows
Summary
by MITRE • 11/11/2020
Windows Error Reporting Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 12/05/2020
This vulnerability resides in the Windows Error Reporting component which is responsible for collecting and transmitting diagnostic information about system errors to Microsoft. The flaw represents a privilege escalation issue that allows a local attacker to elevate their access level from standard user to system level privileges. The vulnerability specifically affects how the Windows Error Reporting service handles certain error messages and diagnostic data processing, creating an opportunity for malicious code execution with elevated privileges. According to CWE-269, this represents a privilege escalation weakness where the system fails to properly enforce access controls during error reporting processes.
The technical implementation of this vulnerability stems from improper validation of error report data within the Windows Error Reporting subsystem. When error reports are processed, the system does not adequately verify the integrity and source of the diagnostic information being collected. This allows a malicious actor to craft specially formatted error reports that trigger unintended code execution paths within the privileged error reporting service. The flaw particularly manifests when the system processes error reports containing crafted malicious payloads that exploit memory handling routines in the reporting service. Attackers can leverage this vulnerability to execute arbitrary code with system-level privileges, effectively bypassing standard user access controls and gaining complete control over the affected system.
The operational impact of CVE-2020-17007 is significant as it provides a direct path for privilege escalation without requiring any user interaction or specific exploitation techniques beyond creating malicious error reports. This vulnerability affects all Windows versions that include the Windows Error Reporting service, making it particularly dangerous in enterprise environments where standard users may have access to systems that could be compromised. The attack vector is relatively straightforward since the vulnerability can be exploited through normal system error reporting mechanisms, requiring no special network access or complex attack chains. Security professionals should note that this vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through local exploitation of system vulnerabilities.
Mitigation strategies for this vulnerability should focus on immediate patch application from Microsoft as the primary defense mechanism, since the flaw exists in core Windows operating system components. Organizations should also implement strict monitoring of error reporting activities and establish baseline behaviors for normal error report processing to detect anomalous activities that might indicate exploitation attempts. Network segmentation and privilege minimization practices can help reduce the potential impact if exploitation occurs, while regular security assessments should include verification that error reporting services are properly configured and monitored. Additionally, implementing application whitelisting policies and disabling unnecessary error reporting features where possible can provide additional defense layers against exploitation attempts targeting this specific vulnerability.