CVE-2011-5084 in Movable Type
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Movable Type 4.x before 4.36 and 5.x before 5.05 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 12/01/2021
The CVE-2011-5084 vulnerability represents a critical cross-site scripting flaw affecting Movable Type content management systems version 4.x prior to 4.36 and 5.x prior to 5.05. 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 vulnerability enables remote attackers to inject malicious web scripts or HTML code into web applications, potentially compromising user sessions and data integrity. The unspecified vectors suggest that the flaw could be exploited through multiple entry points within the application's input handling mechanisms.
The technical nature of this vulnerability stems from inadequate input validation and output encoding within the Movable Type platform's processing pipeline. When users interact with the system through various interfaces such as comment forms, content submission areas, or administrative panels, the application fails to properly sanitize user-supplied data before rendering it in web pages. This allows malicious actors to craft payloads containing script tags or other HTML elements that execute in the context of other users' browsers. The vulnerability's remote exploitation capability means that attackers do not need physical access to the system or network, making it particularly dangerous for web applications that serve public-facing interfaces.
The operational impact of CVE-2011-5084 extends beyond simple script injection, as it can enable sophisticated attack vectors such as session hijacking, credential theft, and data exfiltration. Attackers could exploit this vulnerability to steal cookies containing session tokens, redirect users to malicious sites, or inject malicious code that persists in the application's database. The vulnerability's presence in both major version lines of Movable Type demonstrates a fundamental flaw in the application's security architecture that affected a significant number of users. According to ATT&CK framework categorization, this vulnerability aligns with T1059 (Command and Scripting Interpreter) and T1566 (Phishing) techniques, as it enables attackers to execute malicious code and manipulate user interactions through web-based attacks.
Mitigation strategies for this vulnerability require immediate patching of affected systems to version 4.36 or 5.05, which contain the necessary security fixes. Organizations should implement comprehensive input validation measures, including the use of HTML sanitization libraries and proper output encoding techniques. The principle of least privilege should be applied to limit the impact of potential exploitation, and web application firewalls can provide additional layers of protection. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other applications. From a compliance perspective, this vulnerability would likely trigger requirements under standards such as pci dss, iso 27001, and nist 800-53, which mandate proper input validation and output encoding to prevent XSS attacks. The vulnerability also highlights the importance of maintaining up-to-date software versions and implementing robust security monitoring to detect potential exploitation attempts.