CVE-2009-3191 in PAD Site Scripts
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in PAD Site Scripts 3.6 allow remote attackers to inject arbitrary web script or HTML via the cat parameter to (1) rss.php and (2) opml.php.
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Analysis
by VulDB Data Team • 12/09/2024
The vulnerability identified as CVE-2009-3191 represents a critical cross-site scripting flaw affecting PAD Site Scripts version 3.6. This vulnerability resides in the web application's handling of user-supplied input within specific script files, creating a pathway for malicious actors to execute arbitrary code in the context of victim browsers. The flaw specifically manifests when the application fails to properly sanitize or validate the cat parameter passed to rss.php and opml.php scripts, allowing attackers to inject malicious payloads that can be executed by unsuspecting users.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a fundamental web application security weakness that enables attackers to inject client-side scripts into web pages viewed by other users. The technical implementation of this flaw demonstrates a classic input validation failure where the application directly incorporates user-provided data without adequate sanitization mechanisms. The cat parameter serves as the attack vector, accepting unfiltered input that gets rendered back to users without proper HTML escaping or context-appropriate encoding, creating an environment where malicious JavaScript code can be executed within the victim's browser session.
The operational impact of this vulnerability extends beyond simple script injection, as it can be leveraged to perform various malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious sites. Attackers can craft payloads that exploit the XSS vulnerability to steal cookies, session tokens, or other sensitive information from users who interact with the compromised application. The remote nature of this attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system, making it particularly dangerous for web applications that handle sensitive user data or business-critical information.
Security professionals should consider implementing multiple layers of defense to address this vulnerability, beginning with immediate input validation and output encoding practices. The recommended mitigation strategy involves implementing proper parameter sanitization techniques that ensure all user-supplied input is validated against expected formats and encoded appropriately for the context in which it will be rendered. Additionally, organizations should deploy web application firewalls and implement content security policies to provide additional protection layers. The vulnerability also highlights the importance of regular security assessments and code reviews to identify similar input handling issues that may exist in other application components, aligning with the ATT&CK framework's emphasis on web application exploitation techniques and the need for comprehensive defensive measures against client-side attacks.