CVE-2021-20685 in Kagemai
Summary
by MITRE • 04/07/2021
Cross-site scripting vulnerability in Kagemai 0.8.8 allows remote attackers to inject an arbitrary script via unspecified vectors.
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Analysis
by VulDB Data Team • 04/11/2021
The vulnerability identified as CVE-2021-20685 represents a cross-site scripting flaw within the Kagemai 0.8.8 web application framework, classified under CWE-79 which specifically addresses cross-site scripting vulnerabilities. This particular weakness exists in the input validation mechanisms of the application, creating an attack surface where malicious actors can potentially execute unauthorized scripts in the context of other users' browsers. The vulnerability manifests through unspecified vectors, indicating that the attack could occur through multiple entry points within the application's data handling processes.
The technical nature of this flaw stems from insufficient sanitization of user-supplied input data before it is rendered back to users within the web interface. When Kagemai processes user inputs without proper validation or encoding measures, it fails to distinguish between legitimate content and potentially malicious script code. This allows attackers to inject malicious JavaScript code through various application interfaces, including form fields, URL parameters, or any other input mechanisms where user data is accepted and subsequently displayed. The vulnerability's classification as remote indicates that exploitation can occur without requiring physical access to the system or local network presence, making it particularly dangerous as it can be leveraged from any location with internet connectivity.
The operational impact of CVE-2021-20685 extends beyond simple data theft or display manipulation, as it provides attackers with the capability to perform session hijacking, redirect users to malicious websites, or execute unauthorized actions on behalf of victims. This vulnerability directly violates the principle of least privilege and can lead to complete compromise of user sessions, especially if the affected application handles sensitive authentication or authorization functions. The potential for persistent XSS attacks means that malicious scripts could remain active within the application for extended periods, continuously compromising users who interact with the vulnerable system. Organizations relying on Kagemai 0.8.8 for their web applications face significant risk of data breaches, credential theft, and potential lateral movement within their network infrastructure.
Mitigation strategies for this vulnerability should prioritize immediate application of security patches from the vendor, as the issue affects a specific version of the software. Organizations should implement comprehensive input validation and output encoding mechanisms to prevent malicious script injection, utilizing established security frameworks such as OWASP's Secure Coding Practices. The implementation of Content Security Policy headers can provide additional defense-in-depth measures, while regular security assessments and penetration testing should be conducted to identify similar vulnerabilities within the application's codebase. According to ATT&CK framework category T1566, this vulnerability represents a technique for initial access through malicious web content, making it essential for organizations to maintain robust web application security controls and user education programs to prevent exploitation of such flaws.