CVE-2017-6486 in reasoncms
Summary
by MITRE
A Cross-Site Scripting (XSS) issue was discovered in reasoncms before 4.7.1. The vulnerability exists due to insufficient filtration of user-supplied data (nyroModalSel) passed to the "reasoncms-master/www/nyroModal/demoSent.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.
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Analysis
by VulDB Data Team • 09/04/2020
The vulnerability identified as CVE-2017-6486 represents a critical cross-site scripting flaw within reasoncms version 4.7.0 and earlier, classified under CWE-79 as improper neutralization of input during web page generation. This weakness allows malicious actors to inject client-side scripts into web applications that users subsequently execute in their browsers. The specific exposure occurs within the nyroModal demoSent.php endpoint where user-supplied data parameter named nyroModalSel is not adequately sanitized or validated before being rendered back to the browser. The vulnerability stems from the application's failure to implement proper input validation and output encoding mechanisms, creating an attack surface where malicious payloads can be seamlessly executed in the context of the vulnerable website.
The technical exploitation of this vulnerability involves an attacker crafting malicious input through the nyroModalSel parameter which is then processed by the vulnerable script without proper sanitization. When the application renders this data back to the browser, any HTML or JavaScript code contained within the parameter executes in the context of the authenticated user's session. This creates a persistent threat where attackers can perform actions on behalf of users, steal session cookies, redirect users to malicious sites, or manipulate the application interface. The vulnerability specifically affects the nyroModal component which is designed to handle modal dialogues and user interactions, making it a prime target for attackers seeking to compromise user sessions or inject malicious content into the application's interface.
The operational impact of CVE-2017-6486 extends beyond simple script execution as it fundamentally compromises the integrity and confidentiality of user interactions within the reasoncms application. Attackers can leverage this vulnerability to perform session hijacking, steal sensitive user information, manipulate application data, or even establish persistent backdoors through more sophisticated payload delivery mechanisms. The vulnerability's location within the demoSent.php endpoint suggests it may be particularly dangerous during testing or demonstration phases when additional user input is expected, potentially allowing attackers to exploit this weakness in production environments where legitimate users might interact with the modal components. This type of vulnerability directly violates the principle of least privilege and can enable attackers to escalate their privileges within the application context.
Mitigation strategies for CVE-2017-6486 should prioritize immediate implementation of input validation and output encoding measures, specifically addressing the nyroModalSel parameter handling within the vulnerable script. Organizations should implement strict validation of all user-supplied input through regular expressions or established sanitization libraries to prevent script injection attempts. The recommended approach includes implementing Content Security Policy headers to limit script execution, employing proper HTML entity encoding for all dynamic content, and ensuring that all parameters passed to web applications undergo rigorous validation before processing. Additionally, upgrading to reasoncms version 4.7.1 or later resolves the vulnerability by implementing proper input filtering mechanisms, aligning with the ATT&CK technique T1059.001 for command and scripting interpreter. Security teams should also conduct comprehensive code reviews focusing on all input handling routines and implement automated scanning tools to identify similar vulnerabilities across the application stack. The remediation process must include thorough testing of all user interaction points to ensure that similar XSS vulnerabilities do not exist in other components of the application framework.