CVE-2021-42287 is classified as a high-severity privilege escalation vulnerability affecting Microsoft Active Directory Domain Services. This vulnerability allows attackers to exploit a weakness in the system, potentially leading to unauthorized access and control over sensitive information. The CVSS score of 7.5 indicates a significant risk, particularly for organizations relying on these services.
The vulnerability was published on November 10, 2021, and has since been analyzed and confirmed by Microsoft. Organizations using affected versions of Windows Server, including 2008, 2012, 2016, 2019, and 2022, should be aware of the potential risks associated with this vulnerability. The urgency for defenders to address this issue is underscored by its critical exploitability status.
Risk to organizations includes significant impacts on confidentiality, integrity, and availability. Attackers may leverage this vulnerability over the network, requiring low privileges and no user interaction. As such, organizations should prioritize patching immediately to safeguard their systems.
The current state of exploitation indicates that there is known exploitation associated with this CVE, further emphasizing the need for immediate action. Organizations should ensure that they are compliant with vendor patching instructions to mitigate potential threats.
Vulnerability Details
The vulnerability allows for elevation of privilege within Microsoft Active Directory Domain Services. The CVSS score varies between 7.5 to 8.8 depending on the source, reflecting the severity of potential impacts. The vulnerability affects Windows Server versions 2008, 2012, 2016, 2019, and 2022, with specific configurations noted as vulnerable.
Technical Analysis
The root cause of CVE-2021-42287 is linked to the improper handling of permissions, leading to a situation where low-privileged users can escalate their privileges within the Active Directory environment. The attack vector is network-based, and it requires low complexity to exploit. No user interaction is needed, making it particularly dangerous.
This vulnerability significantly impacts confidentiality, integrity, and availability, all rated as high. Organizations must assess their exposure to this vulnerability and take immediate action to remediate.
Risk & Impact Analysis
Real-world deployment risk is amplified due to the known exploitation status of this vulnerability. Organizations should evaluate how this vulnerability could impact their security posture and the potential blast radius. Given the high CVSS score and its classification within the KEV catalog, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
The following versions of Windows Server are affected by CVE-2021-42287: Windows Server 2008, Windows Server 2012, Windows Server 2016, Windows Server 2019, and Windows Server 2022. Organizations running these versions should ensure that they apply the necessary patches.
Mitigation & Remediation
To remediate CVE-2021-42287, organizations must apply the updates provided by Microsoft. It is critical to follow vendor instructions carefully to ensure that the systems are protected from exploitation. Additionally, organizations should consider implementing network controls and hardening configurations to further mitigate risks. For more information on effective remediation strategies, organizations can refer to our penetration testing services which can help identify weaknesses.
Detection Guidance
Organizations should monitor logs for unusual access patterns and potential privilege escalation attempts. Behavioral anomalies, such as unexpected changes in user roles or permissions, should also be investigated. Network signatures associated with exploit attempts should be established and monitored to ensure early detection.
AppSecure Threat Intelligence Insight
CVE-2021-42287 highlights the importance of maintaining up-to-date security practices within organizations. The known exploitation status and high EPS score indicate that this vulnerability is a significant threat to the integrity of Active Directory environments. Organizations should regularly review their security posture and consider implementing vulnerability management programs that address similar vulnerabilities. Engaging in penetration testing can also help organizations identify and mitigate risks proactively.
Furthermore, organizations must engage in continuous security assessments and adapt to emerging threats to maintain a robust defense against vulnerabilities like CVE-2021-42287.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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