CVE-2016-4164 in Brackets
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Adobe Brackets before 1.7 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 01/27/2019
Adobe Brackets version 1.7 and earlier contains a cross-site scripting vulnerability that enables remote attackers to execute arbitrary web scripts or HTML code within the context of a user's browser session. This vulnerability stems from insufficient input validation and output encoding mechanisms within the application's web interface components. The flaw exists in the manner in which the software processes user-provided data that is subsequently rendered in web pages without proper sanitization or escaping of potentially malicious content. Attackers can exploit this weakness by crafting specially designed inputs that, when processed by the vulnerable Brackets application, get executed as client-side scripts in the victim's browser. The vulnerability affects the application's handling of user-generated content, particularly in contexts where user input is directly embedded into HTML output without appropriate security measures. This represents a classic XSS flaw that aligns with CWE-79, which categorizes improper neutralization of input during web page generation as a primary cause of cross-site scripting vulnerabilities. The attack vector operates through the manipulation of web application interfaces where user input is not properly validated or escaped, allowing malicious code execution in the context of the victim's session. The impact of this vulnerability extends beyond simple script execution as it can potentially enable session hijacking, data theft, or further exploitation of the user's browser environment. According to ATT&CK framework, this vulnerability maps to T1059.001 for command and script injection techniques, specifically targeting the execution of malicious scripts within the web application context. The vulnerability's exploitation requires minimal privileges and can be executed remotely, making it particularly dangerous for developers who may unknowingly introduce malicious payloads through seemingly benign user interactions. Security researchers have identified that the vulnerability manifests when user-provided data flows through the application's rendering pipeline without appropriate input filtering or output encoding measures. The affected versions of Brackets fail to implement robust sanitization routines for handling potentially malicious user inputs that are later displayed in the application's user interface. This flaw demonstrates a fundamental weakness in the application's security architecture regarding the handling of dynamic content and user interaction within web-based environments.
The technical implementation of this vulnerability involves the application's failure to properly escape or sanitize user-supplied data before rendering it in HTML contexts. When users interact with the Brackets interface, particularly when working with code files or project data that contains special characters or script tags, the application does not adequately process this input to prevent malicious code execution. The vulnerability occurs in the application's HTML rendering engine where user content is directly incorporated into web page elements without proper security controls. This creates an environment where an attacker can inject malicious scripts that execute in the context of the user's browser session, potentially leading to unauthorized actions or data exposure. The lack of input validation and output encoding creates a persistent security gap that allows for various types of malicious payloads to be successfully executed. The vulnerability's impact is amplified by the fact that Brackets is widely used by developers for web application development, meaning that exploitation could potentially affect multiple projects and users simultaneously. The flaw essentially allows attackers to bypass the browser's security restrictions by injecting code that executes within the application's own security context, making it particularly dangerous for environments where sensitive code development occurs.
Mitigation strategies for this vulnerability involve implementing comprehensive input validation and output encoding mechanisms throughout the application's codebase. Organizations should immediately upgrade to Adobe Brackets version 1.7 or later, which contains the necessary security patches to address this vulnerability. The remediation process requires developers to ensure that all user-provided content is properly sanitized before being rendered in the application's interface. This includes implementing proper HTML escaping routines, validating input against expected formats, and using secure coding practices that prevent the direct embedding of user data into executable contexts. Security measures should also include content security policy (CSP) headers to prevent unauthorized script execution, although this is secondary to the core input sanitization requirements. The vulnerability's resolution demonstrates the importance of maintaining up-to-date software versions and implementing robust security controls in development environments. Organizations should also consider implementing additional monitoring and logging mechanisms to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure coding practices, particularly in applications that handle user-generated content and render it in web contexts. Regular security assessments and code reviews should be conducted to identify similar weaknesses in other components of the development environment. The remediation process must ensure that all input handling routines properly escape or validate data before it is processed or displayed, with particular attention to areas where user content is directly embedded into HTML structures. This vulnerability highlights the need for comprehensive security training for developers working with web application frameworks and tools that process user input in potentially dangerous contexts.