CVE-2006-4739 in Jetbox CMS
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Jetbox CMS allow remote attackers to inject arbitrary web script or HTML, as demonstrated via the OriginalImageData parameter to phpthumb.php.
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Analysis
by VulDB Data Team • 09/20/2017
The vulnerability described in CVE-2006-4739 represents a critical security flaw in Jetbox CMS that exposes the system to multiple cross-site scripting attacks. This issue specifically targets the phpthumb.php component within the content management system, making it a significant concern for web applications that rely on image processing functionality. The vulnerability allows remote attackers to inject malicious web scripts or HTML code directly into the application's response, potentially compromising user sessions and data integrity.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the phpthumb.php script. When the OriginalImageData parameter is processed, the application fails to properly sanitize user-supplied data before incorporating it into the HTML response. This lack of proper sanitization creates an opening for attackers to inject malicious payloads that execute in the context of other users' browsers. The vulnerability manifests as a classic reflected cross-site scripting issue where malicious input is immediately reflected back to users without appropriate encoding or filtering mechanisms.
From an operational perspective, this vulnerability presents substantial risks to organizations using Jetbox CMS. Attackers can exploit this flaw to steal session cookies, redirect users to malicious websites, or execute unauthorized actions on behalf of authenticated users. The impact extends beyond simple data theft, as successful exploitation could lead to complete compromise of user accounts and potentially allow attackers to escalate privileges within the application. The reflected nature of the attack means that victims typically need to be tricked into clicking malicious links, making social engineering a critical component of exploitation strategies.
The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates characteristics consistent with ATT&CK technique T1566.001 for initial access through spearphishing attachments or links. Organizations affected by this vulnerability should prioritize immediate remediation through input validation patches and output encoding improvements. The recommended mitigation strategy includes implementing proper parameter validation for all user inputs, particularly those used in dynamic content generation, and applying comprehensive output encoding to prevent script execution in HTML contexts. Additionally, deploying web application firewalls and implementing content security policies can provide additional layers of protection against similar vulnerabilities in the future.
Security practitioners should note that this vulnerability exemplifies the importance of input validation in web applications and the critical need for proper output encoding when dealing with dynamic content. The issue highlights how seemingly benign functionality like image processing can become a vector for sophisticated attacks when proper security measures are not implemented. Organizations should conduct comprehensive security assessments of their web applications to identify similar vulnerabilities and ensure that all user-supplied data is properly validated and sanitized before processing.