CVE-2018-0672 in Movable Type
Summary
by MITRE
Cross-site scripting vulnerability in Movable Type versions prior to Ver. 6.3.1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 03/20/2020
The CVE-2018-0672 vulnerability represents a critical cross-site scripting flaw discovered in Movable Type content management systems prior to version 6.3.1. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the improper validation of user-supplied input within web applications. The flaw enables remote attackers to execute malicious scripts in the context of a victim's browser, potentially compromising user sessions and data integrity. The vulnerability manifests through unspecified vectors within the application's input handling mechanisms, suggesting that multiple pathways could be exploited depending on the specific implementation details of the affected system. This type of vulnerability is particularly dangerous as it can be leveraged to steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users without their knowledge. The vulnerability exists due to inadequate sanitization of user-provided data before rendering it within web pages, creating an attack surface where malicious input can be executed as legitimate script code.
The technical exploitation of this vulnerability occurs when user input is not properly validated or escaped before being displayed in web pages. Attackers can craft malicious payloads that, when processed by the vulnerable Movable Type application, get executed in the browsers of unsuspecting users. The unspecified vectors indicate that the vulnerability may affect various input points within the application including form fields, URL parameters, or API endpoints that handle user content. This broad attack surface makes the vulnerability particularly challenging to defend against, as it could potentially be exploited through multiple entry points within the application architecture. The vulnerability is classified as a remote code execution risk because the malicious scripts can be delivered through standard web browsing mechanisms, requiring no special privileges or local access from the attacker. This characteristic aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, as the vulnerability enables attackers to execute arbitrary code through web-based interfaces.
The operational impact of CVE-2018-0672 extends beyond simple script injection, potentially allowing attackers to escalate privileges and compromise entire user sessions. When exploited successfully, this vulnerability could enable attackers to steal sensitive information, modify content, or even take complete control of user accounts within the affected Movable Type installations. The vulnerability affects organizations that rely on Movable Type for content management, potentially exposing them to data breaches, reputation damage, and compliance violations. Organizations using vulnerable versions of Movable Type face increased risk of targeted attacks, especially if their applications are publicly accessible or used by authenticated users. The vulnerability's impact is amplified when considering that Movable Type is often used for managing sensitive corporate or personal content, making the potential for data exfiltration or content manipulation particularly concerning. Security teams must consider the broader implications of this vulnerability within their network security posture, as it could serve as an initial access vector for more sophisticated attacks. The vulnerability also raises concerns about the application's overall security architecture and input validation practices, potentially indicating deeper issues with the software's security design principles.
Mitigation strategies for CVE-2018-0672 focus primarily on immediate remediation through software updates and patches. Organizations should prioritize upgrading to Movable Type version 6.3.1 or later, which contains the necessary fixes for this vulnerability. Additionally, implementing proper input validation and output encoding mechanisms can provide defense-in-depth measures against similar vulnerabilities. Web application firewalls should be configured to detect and block suspicious script injection attempts, while security headers like Content Security Policy can help prevent script execution in vulnerable contexts. Regular security assessments and penetration testing should be conducted to identify potential input validation gaps within the application. Organizations should also implement proper user input sanitization techniques, including HTML escaping for all dynamic content, and ensure that all user-supplied data is properly validated before being processed or displayed. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software components and implementing robust security controls throughout the application lifecycle, as outlined in security standards such as OWASP Top 10 and NIST cybersecurity frameworks. Regular security training for developers and administrators is essential to prevent similar vulnerabilities from being introduced in future versions of the software.