CVE-2020-21729 in JEECMS
Summary
by MITRE • 10/08/2021
JEECMS x1.1 contains a stored cross-site scripting (XSS) vulnerability in the component of /member-vipcenter.htm, which allows attackers to execute arbitrary web scripts or HTML via a crafted payload.
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Analysis
by VulDB Data Team • 10/14/2021
The CVE-2020-21729 vulnerability represents a critical stored cross-site scripting flaw discovered in JEECMS version x1.1, specifically within the member VIP center component at /member-vipcenter.htm. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws. The issue manifests when the application fails to properly sanitize user input before rendering it in the web interface, creating an environment where malicious actors can inject persistent scripts that execute in the context of other users' browsers. The vulnerability is particularly concerning because it allows attackers to execute arbitrary web scripts or HTML code, potentially leading to session hijacking, credential theft, or further exploitation of the affected system.
The technical exploitation of this vulnerability occurs through the manipulation of input fields within the member VIP center functionality, where user-supplied data is stored and subsequently reflected back to other users without adequate sanitization or encoding. When an authenticated user accesses the vulnerable page, the malicious payload that was previously stored in the database executes in their browser context, enabling attackers to perform actions such as stealing session cookies, redirecting users to malicious sites, or injecting additional malicious content. This stored XSS variant is particularly dangerous because the malicious code persists in the application's database and affects all users who view the affected content, making it a significant threat to user privacy and application integrity.
The operational impact of CVE-2020-21729 extends beyond simple script execution, as it can enable attackers to escalate privileges and compromise the entire user session. According to ATT&CK framework technique T1531, this vulnerability can be leveraged to hijack user sessions and gain unauthorized access to sensitive member information. The vulnerability affects the authentication and authorization mechanisms of the JEECMS platform, potentially allowing attackers to impersonate legitimate users and access restricted areas of the application. Additionally, the stored nature of the vulnerability means that the malicious payload can be executed repeatedly against multiple users over time, amplifying the potential damage and making detection more challenging.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The most effective approach involves sanitizing all user-provided input before storage and properly encoding output data when rendered in the browser context. Organizations should implement Content Security Policy headers to limit the sources from which scripts can be executed, and establish proper input validation routines that reject or sanitize potentially malicious content. The vulnerability also highlights the importance of regular security testing and code reviews, particularly focusing on areas where user input is processed and stored. Additionally, implementing proper access controls and monitoring user activities within the member VIP center component can help detect and prevent unauthorized exploitation attempts. Security patches should be applied immediately upon availability, and organizations should consider implementing web application firewalls to provide additional protection layers against similar attacks.