CVE-2020-19002 in Mezzanine
Summary
by MITRE • 08/28/2021
Cross Site Scripting (XSS) in Mezzanine v4.3.1 allows remote attackers to execute arbitrary code via the 'Description' field of the component 'admin/blog/blogpost/add/'. This issue is different than CVE-2018-16632.
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Analysis
by VulDB Data Team • 09/01/2021
The vulnerability identified as CVE-2020-19002 represents a cross site scripting flaw within the Mezzanine content management system version 4.3.1 that exposes administrators and users to significant security risks. This particular vulnerability exists within the administrative interface of the platform, specifically in the blog post creation module accessible through the URL path admin/blog/blogpost/add/. The flaw allows remote attackers to inject malicious script code through the Description field of blog posts, creating a persistent threat vector that can compromise user sessions and execute unauthorized actions.
The technical nature of this vulnerability aligns with CWE-79 which categorizes cross site scripting as a weakness that occurs when an application fails to properly validate or escape user input before rendering it in web pages. The vulnerability specifically manifests in the administrative context where the Description field is processed without adequate sanitization of potentially malicious content. When administrators or users view blog posts containing malicious scripts, the injected code executes in their browsers, creating opportunities for session hijacking, data theft, or further exploitation of the compromised systems.
The operational impact of this vulnerability extends beyond simple script execution as it can enable attackers to perform a wide range of malicious activities within the context of the vulnerable application. An attacker who successfully exploits this vulnerability can potentially access administrative functions, modify content, steal session cookies, redirect users to malicious sites, or even escalate privileges within the compromised environment. The fact that this vulnerability exists in the administrative interface makes it particularly dangerous as it can provide attackers with elevated access rights and control over the entire blog platform.
This vulnerability differs from CVE-2018-16632 which indicates that while both issues involve cross site scripting in Mezzanine, they affect different components or fields within the application. The distinction is important for security teams to understand the scope of potential impacts and to implement comprehensive patching strategies. The vulnerability's location in the admin/blog/blogpost/add/ component suggests that the attack surface is specifically targeted at content creation workflows where users may be less vigilant about input validation.
Mitigation strategies for this vulnerability should include immediate application of security patches released by the Mezzanine development team to address the specific XSS flaw in the Description field handling. Organizations should also implement input validation and output encoding mechanisms that sanitize all user-provided content before rendering it in web pages. Additionally, implementing content security policies can provide an additional layer of protection by restricting the sources from which scripts can be executed. Security teams should consider implementing web application firewalls that can detect and block malicious script injection attempts, and conduct regular security assessments to identify similar vulnerabilities in other components of the application stack.
The vulnerability demonstrates the critical importance of proper input validation and output encoding in web applications, particularly those with administrative interfaces. It aligns with ATT&CK technique T1059.007 which covers scripting languages and T1566 which involves phishing attacks that can leverage XSS vulnerabilities to compromise systems. Organizations should also consider implementing privileged access management controls to limit administrative access and reduce the potential impact of successful exploitation. Regular security training for administrators and developers can help prevent similar issues by promoting secure coding practices and awareness of common web application vulnerabilities.