Microsoft is aware of a vulnerability in the Servicing Stack that has rolled back the fixes for some vulnerabilities affecting Optional Components on Windows 10, version 1507. This means that an attacker could exploit these previously mitigated vulnerabilities on affected systems that have installed the Windows security update released on March 12, 2024—KB5035858 or other updates released until August 2024. All later versions of Windows 10 are not impacted by this vulnerability.
This servicing stack vulnerability is addressed by installing the September 2024 Servicing Stack Update (SSU KB5043936) and the September 2024 Windows security update (KB5043083), in that order. Organizations should prioritize patching immediately.
Note that Windows 10, version 1507 reached the end of support on May 9, 2017, for devices running the Pro, Home, Enterprise, Education, and Enterprise IoT editions. Only Windows 10 Enterprise 2015 LTSB and Windows 10 IoT Enterprise 2015 LTSB editions are still under support.
The severity of this vulnerability is classified as critical with a CVSS score of 9.8, indicating a significant risk to organizations that continue to operate systems with Windows 10, version 1507.
Risk to organizations includes the potential for unauthorized access and exploitation, emphasizing the urgent need for immediate action.
Vulnerability Details
The vulnerability identified as CVE-2024-43491 allows attackers to exploit previously mitigated vulnerabilities in Windows 10 version 1507. The affected product is Microsoft Windows 10, and the vulnerability is classified under CWE-416.
The CVSS score of 9.8 indicates a critical severity level, reflecting the high potential impact on confidentiality, integrity, and availability.
Technical Analysis
The root cause of this vulnerability lies within the Servicing Stack where fixes for certain vulnerabilities were rolled back. The attack vector is network-based, requiring low complexity, and no privileges or user interaction is necessary for exploitation.
The vulnerability impacts confidentiality, integrity, and availability with high severity, making it critical for organizations to address it promptly.
Risk & Impact Analysis
The real-world risk associated with this vulnerability includes unauthorized access to sensitive data and potential system compromise. Organizations that continue using Windows 10, version 1507, particularly those that have not migrated to later versions, may face significant risks.
The blast radius of this vulnerability extends to all devices running the affected versions, highlighting the urgent need for remediation given the critical nature of the vulnerabilities that could be exploited.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is Windows 10 version 1507. All versions prior to the vendor patch are vulnerable.
Mitigation & Remediation
To mitigate this vulnerability, install the September 2024 Servicing Stack Update (SSU KB5043936) followed by the September 2024 Windows security update (KB5043083). Organizations should prioritize patching immediately.
For ongoing protection, consider implementing continuous security testing strategies. This ensures vulnerabilities are identified and mitigated proactively.
Detection Guidance
Monitor logs for unusual system behavior and track any changes made during the installation of updates. Look for indicators that may suggest a rollback of security measures.
AppSecure Threat Intelligence Insight
This vulnerability underscores the importance of maintaining up-to-date systems and the potential risks associated with unsupported software. Organizations should remain vigilant and establish a robust vulnerability management program.
For comprehensive security assessments, organizations are encouraged to explore our application security assessment services which can help identify vulnerabilities that could leave systems exposed.
Additionally, implementing a penetration testing approach can further enhance security posture by proactively identifying and addressing vulnerabilities.
Finally, security teams should regularly review and update their vulnerability management program to ensure they are prepared for emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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