CVE-2020-20522 in KiteCMS
Summary
by MITRE • 04/04/2023
Cross Site Scripting vulnerability found in KiteCMS v.1.1 allows a remote attacker to execute arbitrary code via the registering user parameter.
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Analysis
by VulDB Data Team • 04/22/2023
The vulnerability identified as CVE-2020-20522 represents a critical cross site scripting flaw within KiteCMS version 1.1 that exposes the application to remote code execution attacks through user registration parameters. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the registration functionality where user input is not properly sanitized or validated before being processed by the application's backend systems. The flaw occurs when the CMS fails to implement adequate input validation mechanisms during the user registration process, allowing malicious actors to inject malicious scripts into the registration form fields that are subsequently executed in the context of other users' browsers.
The technical exploitation of this vulnerability enables attackers to craft specially formatted registration requests containing malicious script payloads that can be executed when the application displays user information or processes the registration data. This type of vulnerability operates at the application layer and can be leveraged to perform session hijacking, defacement of user accounts, or redirection to malicious websites. The attack vector specifically targets the user registration parameter handling, where the CMS does not properly escape or filter user-supplied data before storing or displaying it within the application interface. The vulnerability is particularly concerning because it allows remote attackers to execute arbitrary code without requiring authentication or privileged access to the system.
The operational impact of CVE-2020-20522 extends beyond simple script execution to potentially compromise the entire CMS infrastructure and user data. Attackers can leverage this vulnerability to inject persistent scripts that will execute whenever affected users view the application interface, leading to widespread session theft, data exfiltration, and potential lateral movement within the network. The vulnerability can be exploited through various means including social engineering campaigns where attackers register accounts with malicious payloads, or through automated scanning tools that identify and exploit the unpatched CMS version. This type of vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, as it allows for the execution of malicious scripts within the application environment.
Mitigation strategies for CVE-2020-20522 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the CMS registration process. Organizations should ensure that all user-supplied data is properly sanitized using whitelist validation techniques and that output encoding is applied to prevent script execution in browser contexts. The immediate solution involves upgrading to a patched version of KiteCMS that addresses the XSS vulnerability in the registration module, as well as implementing proper content security policies to limit script execution capabilities. Additionally, organizations should deploy web application firewalls to detect and block malicious registration attempts, conduct regular security assessments of CMS installations, and implement proper monitoring to identify unauthorized registration activities. The vulnerability demonstrates the critical importance of input validation in web applications and the potential consequences of failing to properly sanitize user data in CMS platforms, making it essential for administrators to maintain updated security practices and regularly audit their web application configurations.