CVE-2023-23416: Windows 10 1507 RCE Vulnerability

CVE-2023-23416 Overview

CVE-2023-23416 is a remote code execution vulnerability affecting Windows Cryptographic Services across a wide range of Microsoft Windows operating systems. This vulnerability allows an attacker with local access and low-level privileges to execute arbitrary code on the affected system. The flaw resides in the cryptographic services component, which is responsible for handling certificate operations and cryptographic functions within the Windows operating system.

The vulnerability stems from improper input validation (CWE-20) within the Windows Cryptographic Services. When a maliciously crafted certificate is imported or processed by the system, it can trigger code execution with the privileges of the current user. This could potentially allow an attacker to install programs, view, change, or delete data, or create new accounts with full user rights on the compromised system.

Critical Impact

Successful exploitation enables arbitrary code execution on affected Windows systems, potentially allowing complete system compromise through manipulation of cryptographic certificate handling.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 20H2, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2)
• Microsoft Windows Server 2012 and R2
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Microsoft Windows Server 2022

Discovery Timeline

• March 14, 2023 - CVE-2023-23416 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-23416

Vulnerability Analysis

The Windows Cryptographic Services Remote Code Execution vulnerability exists due to improper input validation when processing certificates. Windows Cryptographic Services is a core component that provides cryptographic operations including certificate management, certificate chain building, and certificate validation services.

This vulnerability requires local access to the target system but does not require user interaction for exploitation. Once an attacker has established a foothold on the system, they can exploit this vulnerability to escalate their capabilities and execute arbitrary code. The attack complexity is low, meaning the vulnerability can be reliably exploited without requiring specialized conditions or extensive preparation.

The impact of successful exploitation is severe across all three security dimensions—confidentiality, integrity, and availability are all highly impacted. An attacker could leverage this vulnerability to access sensitive cryptographic material, modify system configurations, or disrupt critical services that rely on cryptographic operations.

Root Cause

The root cause of CVE-2023-23416 is classified as CWE-20 (Improper Input Validation). The Windows Cryptographic Services component fails to properly validate input when processing certain types of certificates. This improper validation allows specially crafted certificate data to be processed in an unsafe manner, leading to memory corruption or other exploitable conditions.

When a malformed or malicious certificate is imported into the Windows certificate store or processed by applications using the Cryptographic Services API, the insufficient validation routines fail to catch the malicious payload, resulting in code execution.

Attack Vector

The attack vector for CVE-2023-23416 is local, meaning an attacker must have some level of access to the target system before exploitation. The attack could be executed through several methods:

The vulnerability can be triggered when the system processes a maliciously crafted certificate file. This could occur when an attacker with local access imports a certificate, when an application processes a certificate from an untrusted source, or when the system automatically processes certificates during routine operations.

The exploitation does not require elevated privileges—an attacker with standard user access can trigger the vulnerability. Additionally, no user interaction is required, meaning the attack can proceed silently once the malicious certificate is in position to be processed by the cryptographic services.

Detection Methods for CVE-2023-23416

Indicators of Compromise

• Unusual certificate import operations or failed certificate validation events in Windows Event Logs
• Unexpected processes spawned by services related to cryptographic operations (CryptSvc or related components)
• Suspicious certificate files with malformed or unusual structures in certificate stores
• Anomalous memory access patterns or crashes in crypt32.dll or related cryptographic service components

Detection Strategies

• Monitor Windows Event Log for certificate-related errors and unusual cryptographic service events (Event IDs in the Application and Security logs)
• Deploy endpoint detection solutions capable of identifying exploitation attempts targeting Windows Cryptographic Services
• Implement file integrity monitoring on certificate store locations and cryptographic service binaries
• Utilize behavioral analysis to detect anomalous code execution patterns following certificate processing operations

Monitoring Recommendations

• Enable detailed logging for Certificate Services and related cryptographic operations
• Monitor for suspicious process creation events where the parent process is a cryptographic service component
• Track certificate import operations, especially those involving certificates from external or untrusted sources
• Implement network monitoring to detect potential lateral movement following exploitation

How to Mitigate CVE-2023-23416

Immediate Actions Required

• Apply the latest security updates from Microsoft immediately for all affected Windows versions
• Restrict certificate import capabilities to authorized administrative personnel only
• Review and audit existing certificates in all certificate stores for anomalies
• Implement application whitelisting to prevent unauthorized code execution

Patch Information

Microsoft has released security updates to address CVE-2023-23416 as part of their security update process. Organizations should obtain and apply the appropriate patches from the Microsoft Security Response Center advisory. The patches address the improper input validation issue in Windows Cryptographic Services by implementing proper bounds checking and validation routines for certificate processing.

Administrators should prioritize patching based on system exposure and criticality. All affected Windows versions from Windows 10 through Windows 11 and Windows Server 2012 through Windows Server 2022 require updates. Ensure Windows Update is configured to receive the latest security patches, or deploy updates manually through WSUS, SCCM, or other enterprise update management solutions.

Workarounds

• Limit local access to systems to only authorized and trusted users until patches can be applied
• Implement strict Group Policy settings to control certificate import operations and restrict which users can manage certificates
• Consider temporarily disabling automatic certificate enrollment if not required for business operations
• Deploy additional endpoint protection with behavioral monitoring capabilities to detect exploitation attempts

# Check for installed patches related to this vulnerability
wmic qfe list brief | findstr /i "KB"

# Review certificate stores for recently imported certificates
certutil -viewstore -user My
certutil -viewstore -enterprise My

# Enable advanced audit policy for certificate services
auditpol /set /subcategory:"Certification Services" /success:enable /failure:enable