CVE-2021-36927 is a high-severity vulnerability classified as an elevation of privilege vulnerability within the Windows Digital TV Tuner device registration application. This vulnerability allows attackers with local access to gain elevated privileges, potentially leading to unauthorized access and control over affected systems. The CVSS score for this vulnerability is 7.8, indicating a high level of risk, particularly for organizations that utilize vulnerable versions of Microsoft Windows.
Risk to organizations includes potential unauthorized access and control over sensitive data and system functions, potentially impacting operations and breach of confidentiality. Given the local attack vector, the urgency for defenders is high, especially for those using affected systems, which include Windows 7, Windows 8.1, Windows RT 8.1, and various Windows Server versions.
As of now, there is no public exploit confirmed, but the nature of the vulnerability and its high severity level necessitate immediate attention from security teams to ensure systems are patched and secure. Organizations should prioritize patching immediately to mitigate risks associated with this vulnerability.
The vulnerability was published on August 12, 2021, and has been modified since its initial disclosure. This modification indicates that further updates, including patches and mitigation strategies, may be available. Organizations are encouraged to stay informed about updates related to this CVE.
Vulnerability Details
The official description of CVE-2021-36927 states that it is a Windows Digital TV Tuner device registration application elevation of privilege vulnerability. This vulnerability exists due to improper handling of certain inputs, allowing attackers with low privileges to exploit this flaw and gain higher-level permissions.
The CVSS 3.1 score is 7.8, classified with high severity. The attack vector is local, and the attack complexity is low, which means that an attacker can exploit this vulnerability easily. Privileges required are low, and user interaction is not necessary, making it more dangerous as it can be executed without alerting the user.
The impacts of this vulnerability are severe, with confidentiality, integrity, and availability all rated as high. This means that successful exploitation could lead to significant data breaches, loss of integrity, and availability of services affected by this vulnerability.
Technical Analysis
The root cause of this vulnerability lies in the handling of device registration inputs by the Windows Digital TV Tuner application. Specifically, the application fails to validate inputs properly, which could allow an attacker to manipulate the application to execute arbitrary code with elevated privileges.
The attack vector is local, meaning that an attacker must have physical or remote local access to the system to exploit this vulnerability. The complexity is low, as attackers do not need advanced skills to exploit this flaw, only the necessary access to the system. The exploitation requires low privileges, which means that any user with basic access can potentially trigger the exploit without needing administrative rights.
User interaction is not required for this vulnerability, making it particularly dangerous as it can be executed without any action from the user. The vulnerability affects the confidentiality, integrity, and availability of the system, as successful exploitation could allow attackers to access sensitive information, modify system settings, or disrupt services.
Risk & Impact Analysis
Real-world deployment risk for CVE-2021-36927 is significant, particularly for organizations still using outdated versions of Windows. Given the high severity score and the potential for exploitation, organizations that rely on affected systems are at an increased risk of unauthorized access and data breaches. The implications of such a breach could lead to severe operational disruptions and reputational damage.
The blast radius potential is considerable, as this vulnerability can affect multiple versions of Windows, including both client and server operating systems. With many organizations still using legacy systems, the urgency for remediation is critical. Organizations should address this vulnerability in their priority patch cycle to mitigate risks and ensure their environments remain secure.
Given the CVSS score of 7.8, organizations should prioritize patching immediately. This is essential not only for protecting sensitive information but also for maintaining the integrity of their operational capabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Microsoft products are affected by CVE-2021-36927:
1. Windows 7 (SP1) 2. Windows 8.1 3. Windows RT 8.1 4. Windows Server 2008 (SP2) 5. Windows Server 2008 R2 (SP1) 6. Windows Server 2012 7. Windows Server 2012 R2
Mitigation & Remediation
Organizations should prioritize patching affected systems immediately. Microsoft has released patches for this vulnerability, and it is critical to apply these updates to mitigate the risk of exploitation. For more information on patching and mitigation strategies, refer to the Microsoft Security Response Center.
Detection Guidance
To detect potential exploitation of CVE-2021-36927, organizations should monitor logs for unusual access attempts and anomalies related to the Windows Digital TV Tuner application. Behavioral indicators could include unexpected privilege escalation events and changes to system settings.
AppSecure Threat Intelligence Insight
CVE-2021-36927 highlights the ongoing challenges of securing legacy systems. As many organizations still use outdated Windows versions, the risk of exploitation remains relevant. Security teams must remain vigilant and proactive in applying patches and updating systems. Learning from such vulnerabilities can help organizations strengthen their overall security posture.
For comprehensive strategies on vulnerability management, organizations can refer to best practices in the vulnerability management program.
Understanding the landscape of vulnerabilities, including trends in privilege escalation, can better equip teams to defend against future threats. Regular reviews of security policies and incident response plans are vital in maintaining an effective security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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