CVE-2020-18702 in Quokka
Summary
by MITRE • 08/16/2021
Cross Site Scripting (XSS) in Quokka v0.4.0 allows remote attackers to execute arbitrary code via the 'Username' parameter in the component 'quokka/admin/actions.py'.
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Analysis
by VulDB Data Team • 08/19/2021
The vulnerability identified as CVE-2020-18702 represents a critical cross site scripting flaw within the Quokka CMS version 0.4.0. This vulnerability resides in the administrative component located at quokka/admin/actions.py and specifically targets the 'Username' parameter handling. The flaw enables remote attackers to inject malicious scripts into the application's user interface, potentially compromising the security of authenticated administrators and regular users who interact with the admin panel. The vulnerability classification aligns with CWE-79, which defines Cross Site Scripting as a common web application security weakness where untrusted data is improperly incorporated into web pages without proper validation or escaping mechanisms.
The technical implementation of this vulnerability occurs when the application fails to properly sanitize or escape user input provided through the Username parameter. When administrators or users view the administrative interface, the unsanitized username data gets rendered directly into the HTML output without appropriate encoding or filtering. This creates an environment where attackers can craft malicious payloads that execute within the context of the victim's browser session. The attack vector is particularly dangerous because it targets the administrative interface, potentially allowing attackers to escalate privileges, steal session cookies, or perform unauthorized administrative actions. The vulnerability demonstrates a classic input validation failure that violates security best practices for web application development.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to complete system compromise when attackers leverage the administrative access. An attacker who successfully exploits this vulnerability could manipulate the CMS configuration, modify or delete content, access sensitive user data, or establish persistent backdoors within the application. The administrative context of the vulnerability means that successful exploitation could result in full control over the CMS, potentially affecting thousands of users depending on the application's scale. This vulnerability also aligns with ATT&CK technique T1059.007, which covers script injection attacks that can be used to execute malicious code in web applications.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and output encoding mechanisms throughout the application. The primary remediation involves sanitizing all user input, particularly in administrative components, by implementing strict validation rules and escaping special characters before rendering data in HTML contexts. Organizations should implement Content Security Policy headers to limit script execution capabilities and employ web application firewalls to detect and block malicious payloads. Additionally, regular security audits and penetration testing should be conducted to identify similar input validation vulnerabilities across the entire application stack. The fix should include comprehensive testing of all parameters that interact with user-supplied data, ensuring that no XSS vulnerabilities remain in the administrative interfaces or any other components that process external input.