CVE-2021-20690 in Yomi-Search
Summary
by MITRE • 04/07/2021
Cross-site scripting vulnerability in Yomi-Search Ver4.22 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-2021-20690 represents a critical cross-site scripting flaw within the Yomi-Search version 4.22 web application. This security weakness enables remote attackers to execute malicious scripts within the context of other users' browsers, potentially leading to unauthorized access to sensitive information or complete compromise of user sessions. The vulnerability stems from insufficient input validation and output encoding mechanisms within the application's processing pipeline, creating an attack surface where malicious payloads can be injected through unspecified vectors that have not been fully documented in the initial disclosure.
The technical nature of this flaw aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities in web applications. This classification indicates that the application fails to properly sanitize user-supplied input before rendering it in web pages, allowing attackers to inject malicious script code that executes in the victim's browser context. The unspecified vectors suggest that the vulnerability may exist across multiple input points within the application's interface, potentially including search parameters, form fields, or URL parameters that are not explicitly defined in the vulnerability description. This broad attack surface increases the likelihood of successful exploitation and makes remediation more complex for system administrators.
From an operational impact perspective, this vulnerability poses significant risks to organizations utilizing Yomi-Search version 4.22 as it could enable attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. The remote nature of the attack means that exploitation does not require physical access to the target system, making it particularly dangerous in environments where the application serves multiple users or handles sensitive data. Attackers could leverage this vulnerability to escalate privileges, access confidential information, or establish persistent access to the affected system, potentially leading to broader security breaches within the organization's network infrastructure.
Security professionals should implement immediate mitigations including input validation and output encoding measures to prevent script injection attempts. The recommended approach involves sanitizing all user inputs through proper encoding techniques such as HTML entity encoding, implementing Content Security Policy headers, and ensuring that all dynamic content is properly escaped before rendering. Organizations should also consider implementing web application firewalls to detect and block suspicious traffic patterns associated with XSS attacks. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities within the application's codebase, as this vulnerability may indicate broader security weaknesses in the application's architecture that require comprehensive remediation efforts to address effectively.