CVE-2020-25735 in webTareas
Summary
by MITRE
webTareas through 2.1 allows XSS in clients/editclient.php, extensions/addextension.php, administration/add_announcement.php, administration/departments.php, administration/locations.php, expenses/claim_type.php, projects/editproject.php, and general/newnotifications.php.
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-25735 affects webTareas version 2.1 and earlier, representing a cross-site scripting vulnerability that compromises user sessions and data integrity across multiple administrative and operational endpoints. This flaw exists in several key files including clients/editclient.php, extensions/addextension.php, and various administration and expense management modules. The vulnerability stems from insufficient input validation and output sanitization mechanisms within the web application's user interface components, allowing malicious actors to inject malicious scripts into web pages viewed by other users.
The technical implementation of this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications. The flaw manifests when user-supplied data is directly incorporated into web page content without proper sanitization or encoding, creating opportunities for attackers to execute malicious JavaScript code within the context of other users' browsers. This particular vulnerability affects multiple endpoints within the webTareas application, indicating a systemic issue in the application's data handling architecture rather than isolated component failures. The impacted files span across client management, extension handling, announcement creation, department management, location administration, expense claim types, project editing, and notification systems, suggesting a comprehensive breakdown in the application's security controls.
The operational impact of this vulnerability is significant as it enables attackers to potentially steal session cookies, redirect users to malicious sites, modify page content, or perform actions on behalf of authenticated users. An attacker could exploit this vulnerability to gain unauthorized access to administrative functions, manipulate client data, or compromise sensitive business information. The vulnerability affects both regular users and administrators, creating potential escalation paths from standard user access to privileged operations. Given the scope of affected files, the impact extends across multiple business functions including client management, project tracking, expense reporting, and internal communications.
Security professionals should consider this vulnerability in relation to ATT&CK technique T1531, which covers "Modify Existing Service" and related malicious activities that could leverage XSS to establish persistent access or escalate privileges. The vulnerability requires minimal technical expertise to exploit, making it particularly dangerous in environments where users may not be security-aware. Organizations should implement immediate mitigations including input validation, output encoding, and Content Security Policy implementation across all affected endpoints. The vulnerability also highlights the importance of regular security assessments and input sanitization practices aligned with OWASP Top Ten recommendations for preventing XSS attacks.
Mitigation strategies should include implementing proper HTML escaping and encoding for all user-supplied data before rendering in web pages, deploying Content Security Policies to restrict script execution, and conducting comprehensive input validation across all application endpoints. Organizations should also consider implementing web application firewalls to detect and block malicious script injection attempts. Regular security training for developers and administrators is essential to prevent similar vulnerabilities in future releases. The vulnerability demonstrates the critical need for consistent security controls across all application modules rather than isolated fixes, emphasizing the importance of security-by-design principles in software development lifecycle processes.