CVE-2021-21422 is a high-severity vulnerability affecting mongo-express, a web-based MongoDB admin interface built using Node.js and Express. This vulnerability allows attackers to exploit the application through various means, including the manipulation of data cells identified as media, which could be rendered without proper sanitization.
The CVSS score of 8.1 indicates a high severity level, primarily because the vulnerability can be exploited over the network with low complexity and no required privileges. Attackers may leverage this vulnerability to execute unauthorized actions, such as exporting collections to themselves without the knowledge of administrators.
Given the potential for serious impact on confidentiality and integrity, organizations using mongo-express should prioritize remediation. Urgency is high, as the vulnerability remains open to exploitation without immediate action.
As of now, there is no known public exploit for CVE-2021-21422, but the possibility of future exploitation remains a concern. Organizations should remain vigilant and apply the necessary patches as they become available.
Vulnerability Details
The vulnerability description indicates that when content in a data cell exceeds a certain size, clicking on that row could reveal the full document unescaped, which is a significant security risk. Furthermore, data cells identified as media can be rendered directly without sanitization, allowing embedded JavaScript payloads to execute.
The CVSS 3.1 vector string for this vulnerability is 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N', which translates to a high confidentiality and integrity impact, with no impact on availability. The vulnerability affects all versions of mongo-express prior to 0.54.0, as well as specific alpha versions.
Technical Analysis
The root cause of CVE-2021-21422 lies in improper handling of large inputs in data cells, leading to potential cross-site scripting (XSS) attacks. The attack vector is primarily network-based, as attackers can exploit the vulnerability remotely.
The attack complexity is low, requiring no special privileges for the attacker, but it does require user interaction to trigger the exploit. This vulnerability poses a significant risk to the confidentiality and integrity of user data.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data, as attackers may exploit this vulnerability to manipulate or export data without detection. The blast radius is significant, especially for organizations using mongo-express in their operational environments.
With the CVSS score indicating high risk, organizations should assess their exposure and prioritize patching this vulnerability immediately. The absence of known exploits does not mitigate the urgency of addressing this issue.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of mongo-express include all versions prior to 0.54.0, along with specific alpha releases: 1.0.0-alpha1 and 1.0.0-alpha3. Organizations using these versions are strongly advised to update immediately.
Mitigation & Remediation
Organizations should prioritize patching mongo-express to version 0.54.0 or later. In cases where immediate patching is not feasible, implementing strong input validation and sanitization measures for all data cells can mitigate the risk of exploitation. Additionally, network controls should be strengthened to limit access to the mongo-express interface.
For more comprehensive security assessments, organizations can consider engaging in penetration testing to identify potential vulnerabilities within their application infrastructure.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor application logs for unusual activity related to data cell interactions. Behavioral anomalies, such as unexpected data exports or modifications, should trigger alerts. Additionally, network signatures indicative of attack patterns should be established.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-21422 highlights the importance of secure development practices, particularly in web applications that handle sensitive data. This vulnerability represents a broader trend of XSS vulnerabilities where user input is not properly sanitized, leading to severe security implications.
Security teams should prioritize the implementation of security testing best practices to mitigate similar vulnerabilities in the future. For organizations using mongo-express, ensuring regular updates and security assessments is critical to maintaining a secure environment.
For further insights into application security, organizations can refer to the following resources: vulnerability management program design, penetration testing methodology, and API security best practices. These resources can provide valuable guidance in enhancing 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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