CVE-2014-3743 in Marked Module
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the Marked module before 0.3.1 for Node.js allow remote attackers to inject arbitrary web script or HTML via vectors related to (1) gfm codeblocks (language) or (2) javascript url's.
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Analysis
by VulDB Data Team • 04/22/2023
The CVE-2014-3743 vulnerability represents a critical cross-site scripting flaw in the Marked module, a popular markdown parser for Node.js applications. This vulnerability existed in versions prior to 0.3.1 and exposed applications using the module to significant security risks. The flaw specifically affected two distinct attack vectors that allowed remote attackers to inject malicious scripts into web applications. The first vector involved gfm codeblocks with language specifications, while the second targeted javascript urls within the markdown processing pipeline. Both attack paths demonstrated the module's insufficient input sanitization mechanisms that failed to properly escape or validate user-supplied content before rendering it as HTML.
The technical implementation of this vulnerability stems from the module's inadequate handling of user-provided markdown content during the parsing process. When processing gfm codeblocks with language identifiers, the module failed to properly sanitize the language parameter, allowing attackers to inject malicious javascript code that would execute in the context of the victim's browser. Similarly, when encountering javascript urls within markdown content, the module did not adequately validate or escape these URLs, creating opportunities for attackers to inject executable scripts. This vulnerability directly maps to CWE-79, which describes Cross-Site Scripting flaws where untrusted data is improperly incorporated into web page content without proper sanitization. The vulnerability's impact extends beyond simple script injection, as it enables attackers to perform session hijacking, defacement of web applications, and data exfiltration from authenticated users.
The operational impact of CVE-2014-3743 was substantial for Node.js applications that relied on the Marked module for markdown processing. Any web application allowing user-generated content to be processed through this vulnerable module became susceptible to persistent XSS attacks. Attackers could craft malicious markdown content that would be rendered as HTML on the target application's pages, potentially compromising user sessions, stealing sensitive information, or redirecting users to malicious sites. The vulnerability's exploitation was particularly concerning because it affected widely used Node.js applications, including content management systems, wikis, and documentation platforms that processed user input through markdown parsers. This flaw essentially provided attackers with a reliable method to compromise web applications that had no direct knowledge of the underlying vulnerability in the markdown processing library.
Mitigation strategies for this vulnerability required immediate action from affected organizations, including upgrading to Marked version 0.3.1 or later where the XSS flaws were addressed through improved input sanitization and output encoding. Organizations should have implemented additional defensive measures such as content security policy headers to limit script execution capabilities, deployed web application firewalls to detect and block malicious payloads, and conducted thorough security reviews of all user-input processing components. The vulnerability highlighted the importance of proper input validation and output encoding practices, aligning with ATT&CK technique T1203 for exploitation of web application vulnerabilities. Additionally, organizations should have established regular security auditing procedures for third-party libraries and dependencies to prevent similar vulnerabilities from being introduced into their applications through the use of insecure components. The incident underscored the critical need for maintaining up-to-date dependencies and implementing comprehensive security testing practices for all web application components that process untrusted data.