CVE-2021-1636 is a high-severity vulnerability identified in Microsoft SQL Server that allows attackers to escalate privileges within the affected system. The CVSS score for this vulnerability is 8.8, indicating a significant risk to organizations that utilize these database solutions. The potential for exploitation is particularly concerning, as the vulnerability can be exploited over the network without requiring user interaction.
As organizations increasingly rely on SQL Server for critical data management, understanding and addressing such vulnerabilities becomes paramount. The urgency for remediation is reflected in the high CVSS score, which categorizes this vulnerability as high severity. Organizations should prioritize patching immediately.
The vulnerability was first published on January 12, 2021, and has since been modified. Given its potential impact, the exploitation status is marked as high, with known exploits available.
Organizations using affected versions of SQL Server should assess their environments for this vulnerability and take appropriate action to mitigate the risks associated with it.
Vulnerability Details
The official description of CVE-2021-1636 indicates that it is a Microsoft SQL elevation of privilege vulnerability. The CVSS score of 8.8 denotes that this vulnerability poses a significant threat, primarily due to its potential to compromise confidentiality, integrity, and availability.
The vulnerability impacts several versions of Microsoft SQL Server, including 2012 SP4, 2014 SP3, 2016 SP2, 2017, and 2019. The CWE classification for this vulnerability is CWE-89, which pertains to improper neutralization of special elements used in an SQL command ('SQL Injection').
Technical Analysis
The root cause of CVE-2021-1636 lies within the SQL Server's handling of certain commands, which can allow an attacker with low privileges to execute commands that should normally be restricted. The attack vector is network-based, requiring minimal complexity due to the low privilege requirements and no user interaction. The impacts on confidentiality, integrity, and availability are all rated as high, indicating severe potential consequences.
Risk & Impact Analysis
The real-world risk of CVE-2021-1636 is significant, as organizations that deploy Microsoft SQL Server may find themselves vulnerable to attacks that could lead to unauthorized access to sensitive data. The blast radius of this vulnerability extends across any organization leveraging the affected SQL Server versions, potentially impacting the confidentiality and integrity of their data and systems.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Microsoft SQL Server include: - Microsoft SQL Server 2012 SP4 - Microsoft SQL Server 2014 SP3 - Microsoft SQL Server 2016 SP2 - Microsoft SQL Server 2017 - Microsoft SQL Server 2019 Organizations using these versions should implement the necessary patches to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
To mitigate CVE-2021-1636, organizations should prioritize applying the latest patches provided by Microsoft for SQL Server. For those unable to patch immediately, consider implementing additional security measures such as network segmentation and access controls to minimize exposure. Regular security assessments and continuous monitoring can also help identify and respond to potential exploit attempts.
Detection Guidance
Organizations should monitor their SQL Server logs for any unusual activity that could indicate attempts to exploit this vulnerability. Key indicators may include unexpected changes to user privileges or unusual SQL command executions. Behavioral analysis and intrusion detection systems can further enhance the ability to detect these exploit attempts.
AppSecure Threat Intelligence Insight
CVE-2021-1636 highlights the importance of maintaining robust security practices within database management systems. As threats evolve, organizations must remain vigilant and proactive in their security posture. For further insights into securing SQL environments, consider exploring our SQL security assessment services, which can help identify and remediate vulnerabilities in your systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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