CVE-2007-2383 in Prototype Framework
Summary
by MITRE
The Prototype (prototypejs) framework before 1.5.1 RC3 exchanges data using JavaScript Object Notation (JSON) without an associated protection scheme, which allows remote attackers to obtain the data via a web page that retrieves the data through a URL in the SRC attribute of a SCRIPT element and captures the data using other JavaScript code, aka "JavaScript Hijacking."
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Analysis
by VulDB Data Team • 05/22/2025
The vulnerability described in CVE-2007-2383 affects the Prototype JavaScript framework version 1.5.1 RC2 and earlier, representing a critical security flaw that undermines data protection mechanisms in web applications. This issue stems from the framework's handling of JSON data exchanges without implementing proper security measures to prevent unauthorized access. The vulnerability specifically targets the framework's approach to data transmission through script elements, creating an attack surface that enables malicious actors to exploit the communication patterns used by the framework. The flaw exists in how Prototype manages data retrieval and processing, particularly when data is transmitted via JSON format through SCRIPT elements with SRC attributes, making it susceptible to interception and exploitation.
The technical implementation of this vulnerability involves the framework's use of JSON data exchange mechanisms without adequate protection schemes. When Prototype applications make requests for data, they often utilize SCRIPT elements to fetch JSON responses from remote servers, with the data being embedded in the SRC attribute of these elements. This approach creates a fundamental security gap because the JSON data is transmitted in a format that can be easily intercepted by attackers. The vulnerability operates through a process where an attacker can construct a malicious web page that references the vulnerable application's data endpoints through SCRIPT elements, then capture the returned JSON data using additional JavaScript code. This methodology effectively bypasses traditional security controls because the data is delivered directly through the browser's script execution mechanism rather than through conventional HTTP requests that might be subject to security headers or CORS policies.
The operational impact of CVE-2007-2383 is significant and far-reaching for applications using vulnerable versions of the Prototype framework. Attackers can exploit this vulnerability to perform JavaScript hijacking attacks that allow them to access sensitive data that would normally be protected within the application's data exchange mechanisms. The vulnerability particularly affects applications that rely on Prototype for AJAX functionality, as these applications often transmit user data, session information, or other sensitive information through JSON responses that can be intercepted and parsed by malicious JavaScript code. This type of attack can lead to data breaches, session hijacking, and unauthorized access to application resources, potentially compromising user privacy and application security. The vulnerability's impact extends beyond simple data theft to potentially enable more sophisticated attacks that leverage the intercepted data for further exploitation within the targeted application environment.
The security implications of this vulnerability align with several established threat models and attack patterns documented in cybersecurity frameworks. This issue can be categorized under CWE-200, which addresses "Information Exposure," and represents a specific implementation of information disclosure through inadequate protection of data in transit. The vulnerability also relates to ATT&CK technique T1566, "Phishing," as attackers can craft malicious web pages that exploit this flaw to capture sensitive data from legitimate applications. Organizations using vulnerable versions of Prototype should implement immediate mitigations including upgrading to version 1.5.1 RC3 or later, which addresses the security gap through proper implementation of data protection measures. Additional protective measures include implementing Content Security Policy headers to restrict script loading from untrusted sources, using proper CORS headers to control cross-origin resource sharing, and implementing additional application-level protections such as JSONP validation and request origin verification to prevent unauthorized data access through script-based data retrieval mechanisms.
This vulnerability demonstrates the critical importance of proper data protection in web application frameworks, particularly when dealing with JSON data exchanges that are commonly used in AJAX implementations. The flaw highlights the necessity for frameworks to implement robust security measures from the ground up, rather than relying on external protections or expecting developers to implement adequate safeguards. Organizations should conduct comprehensive security assessments of their web applications to identify all instances of Prototype usage and ensure proper version upgrades are implemented across their entire application portfolio. The vulnerability also underscores the need for security awareness training for development teams regarding the proper handling of data transmission mechanisms and the potential risks associated with using frameworks that lack adequate built-in protection schemes for sensitive data exchanges.