CVE-2023-21746 is a high-severity vulnerability classified as an elevation of privilege vulnerability in Microsoft Windows. It has a CVSS score of 7.8, indicating that it poses a significant risk to systems that remain unpatched. Organizations using affected versions of Microsoft Windows should prioritize addressing this vulnerability to mitigate potential exploitation risks.
This vulnerability allows attackers with local access to elevate their privileges, potentially leading to unauthorized access to sensitive information and system controls. The urgency for defenders is heightened as the vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server editions.
As of the last update, there is no official known exploit confirmation available. However, with the existence of public proof-of-concept code, organizations are encouraged to implement remediation measures as a precaution.
Organizations should prioritize patching immediately to ensure systems are not vulnerable to potential exploitation, especially considering the high CVSS score and the nature of the vulnerability.
Vulnerability Details
The official description of CVE-2023-21746 indicates a Windows NTLM elevation of privilege vulnerability. This vulnerability has a CVSS score of 7.8, classified under high severity, due to its significant impact on confidentiality, integrity, and availability.
The affected products include various releases of Windows 10 and Windows 11, as well as several Windows Server editions. The vulnerability was published on January 10, 2023, and has been modified since its initial disclosure.
As per the Common Weakness Enumeration (CWE), there is no specific CWE classification associated with this vulnerability.
Technical Analysis
The root cause of CVE-2023-21746 stems from improper access controls within the Windows NTLM authentication protocol, allowing a local attacker to exploit the vulnerability. The attack vector is local, meaning that an attacker must have local access to the system to exploit the vulnerability.
The attack complexity is rated as low, with low privileges required for exploitation and no user interaction necessary. The impact on confidentiality, integrity, and availability is high, indicating a severe risk to affected systems.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive data and potential system control loss, which could lead to further attacks or data breaches. The blast radius for this vulnerability is significant due to the number of affected products and versions.
Given the CVSS score of 7.8 and the critical nature of the vulnerability, organizations should address this vulnerability in their priority patch cycle. The existing exploitability factors further underline the urgency for remediation.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
CVE-2023-21746 affects multiple versions of Microsoft Windows, including:
Windows 10, Windows 11, Windows 7, Windows 8.1, Windows RT 8.1, various versions of Windows Server (2008, 2012, 2016, 2019, 2022). If specific version information is unavailable, it is stated that all versions prior to vendor patch are vulnerable.
Mitigation & Remediation
To mitigate the risks associated with CVE-2023-21746, organizations should promptly apply the vendor-supplied patches. For those unable to patch immediately, implementing configuration hardening and network controls can help reduce exposure.
It is recommended to validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
To detect potential exploitation attempts related to this vulnerability, organizations should monitor log indicators for unusual authentication attempts and changes in user privileges. Behavioral anomalies in user activities can also serve as indicators of compromise.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-21746 lies in the continuing evolution of attack vectors targeting local privilege escalation. Security teams should learn from this incident to enhance their defenses against similar threats in the future.
The pattern of exploiting elevation of privilege vulnerabilities indicates a trend that necessitates ongoing vigilance and robust security posture. Organizations should consider adopting a proactive approach to security testing and vulnerability management.
For further insights and protective measures, organizations can refer to our blog on penetration testing methodology, and explore additional resources on vulnerability management programs to strengthen the overall security framework.
With continuous monitoring and prompt remediation, organizations can significantly reduce the impact of vulnerabilities such as CVE-2023-21746.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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