CVE-2021-36393 is a critical vulnerability in Moodle, identified as an SQL injection risk in the library that fetches a user's recent courses. This vulnerability has been classified with a CVSS score of 9.8, indicating a serious threat that organizations must address promptly. The SQL injection vulnerability allows attackers to manipulate database queries, potentially leading to unauthorized access and exposure of sensitive data.
The vulnerability was published on March 6, 2023, and affects multiple versions of Moodle. Given its critical nature, organizations using affected versions should prioritize patching immediately to mitigate the risk associated with this vulnerability.
Risk to organizations includes potential unauthorized access to user data, which may lead to further exploitation or data breaches. As such, this vulnerability necessitates immediate attention and remediation from all users of the affected software.
The vulnerability has been confirmed to have a known exploit. Organizations should not only patch their systems but also review their security measures to ensure comprehensive protection against such vulnerabilities.
Organizations must act swiftly and ensure that their Moodle installations are updated to the latest versions to mitigate the risks associated with CVE-2021-36393.
Vulnerability Details
The vulnerability description states that in Moodle, an SQL injection risk was identified in the library fetching a user's recent courses. It is classified under CWE-89, which pertains to SQL injection issues. The CVSS score of 9.8 places this vulnerability in the critical severity category, indicating a high level of risk.
This vulnerability requires no privileges or user interaction to exploit, making it particularly dangerous. Attackers can execute SQL commands over the network with low attack complexity, which increases the likelihood of exploitation.
The affected product is Moodle, and the vulnerability impacts versions prior to 3.9.8, versions between 3.10.0 and 3.10.5, and versions between 3.11.0 and 3.11.1.
Technical Analysis
The root cause of CVE-2021-36393 is an improper input validation in the SQL query processing component of Moodle. This vulnerability allows an attacker to manipulate SQL queries, which can lead to unauthorized data access and manipulation.
The attack vector for this vulnerability is over the network, requiring no privileges or user interaction from the victim. The attack complexity is low, allowing even less skilled attackers to exploit this vulnerability.
The confidentiality, integrity, and availability impacts are all classified as high, emphasizing the seriousness of this vulnerability. Attackers may leverage this vulnerability to access sensitive user data, alter database entries, and disrupt service availability.
Risk & Impact Analysis
The deployment of the Moodle platform in educational institutions and organizations highlights the real-world risks associated with this vulnerability. Given the critical nature of the data managed by Moodle, including student records and sensitive course information, the potential blast radius of an attack exploiting this vulnerability is significant.
Organizations should prioritize addressing CVE-2021-36393 in their patch management cycles. The urgency is underscored by the high CVSS score and the known exploit, which indicates that attackers may actively seek to exploit vulnerable systems.
The risk to organizations includes potential unauthorized access to user data, which may lead to reputational damage and legal ramifications. Organizations must take proactive steps to mitigate this risk.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Moodle prior to 3.9.8 are affected. Additionally, versions 3.10.0 to 3.10.5 and 3.11.0 to 3.11.1 are also vulnerable. Organizations must ensure they are running up-to-date versions of Moodle to be secure.
Mitigation & Remediation
Moodle has released patches to address this vulnerability. Organizations should upgrade to the latest version of Moodle to mitigate the risk associated with CVE-2021-36393. If immediate patching is not possible, organizations should implement workarounds such as restricting access to affected components and monitoring database interactions for unusual activities.
Configuration hardening, including limiting database permissions and enforcing secure coding practices, can also reduce exposure to SQL injection vulnerabilities. Continuous monitoring for potential exploitation attempts is essential.
For further guidance, organizations may consider engaging in continuous penetration testing to identify vulnerabilities in their systems.
Detection Guidance
Organizations should monitor logs for unusual queries and access patterns that may indicate exploitation attempts. Behavioral anomalies in user activities, particularly in database interactions, should be flagged for further investigation.
Detection signatures for network traffic that may exploit this vulnerability should be established and continuously updated. Keeping software and dependency libraries up-to-date is critical for reducing detection and response times.
AppSecure Threat Intelligence Insight
CVE-2021-36393 highlights the ongoing challenge of SQL injection vulnerabilities in web applications. Security teams must recognize the patterns and trends associated with such vulnerabilities and ensure robust defenses are in place. This incident serves as a reminder of the importance of secure coding practices and regular security assessments.
Organizations can benefit from implementing a comprehensive vulnerability management program to prioritize and address security weaknesses effectively.
In conclusion, organizations must remain vigilant against SQL injection vulnerabilities and continuously adapt their security strategies to counter evolving threats. Regular security training and awareness can further strengthen an organization's defensive posture.
For detailed guidance on securing web applications, organizations may refer to the web application penetration testing guide provided by AppSecure.
Known Exploitation Timeline
As of now, this vulnerability is not included in the KEV catalog and there are no known details indicating active exploitation.
EPSS Risk Context
The EPSS score for CVE-2021-36393 is approximately 0.2677, placing it in the 96th percentile for risk. This indicates a notable probability of exploitation in the wild, and organizations should act accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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