CVE-2002-0439 in CaupoShop
Summary
by MITRE
Cross-site scripting vulnerability in CaupoShop 1.30a and earlier, and possibly CaupoShopPro, allows remote attackers to execute arbitrary Javascript and steal credit card numbers or delete items by injecting the script into new customer information fields such as the message field.
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Analysis
by VulDB Data Team • 05/27/2019
This cross-site scripting vulnerability exists in CaupoShop versions 1.30a and earlier, as well as potentially in CaupoShopPro, representing a critical security flaw that enables remote attackers to execute malicious javascript code within the context of affected web applications. The vulnerability specifically targets input fields used for customer information, particularly the message field, where attackers can inject malicious scripts that will be executed when other users view the affected data. This type of vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that occurs when user-provided data is not properly sanitized before being rendered in web pages.
The technical implementation of this vulnerability allows attackers to inject javascript code into customer information fields, which then executes in the browsers of other users who view this data. When customers submit information through the web interface, particularly in message fields, the application fails to properly validate or sanitize the input before storing and displaying it. This creates an environment where malicious actors can embed javascript payloads that can perform various harmful actions including stealing credit card information, manipulating the application interface, or deleting items from the database. The vulnerability is particularly dangerous because it leverages the trust relationship between the web application and its users, executing code in the context of legitimate sessions.
The operational impact of this vulnerability is severe and multifaceted, as it can lead to complete compromise of customer data and application integrity. Attackers can exploit this weakness to steal sensitive credit card information, manipulate inventory data, and potentially gain unauthorized access to the application backend through session hijacking or other related attacks. The vulnerability also creates persistent threats where malicious scripts can remain active in the application for extended periods, continuously compromising user sessions and data. This type of attack pattern aligns with ATT&CK technique T1531 - Account Access Removal, as well as T1071.001 - Application Layer Protocol: Web Protocols, where attackers leverage web application vulnerabilities to achieve their objectives.
Mitigation strategies for this vulnerability should include immediate implementation of input validation and output encoding mechanisms to prevent malicious scripts from being executed. Organizations should implement proper sanitization of all user input, particularly in fields where customers can submit data, and ensure that all output is properly encoded to prevent script execution in web contexts. The solution involves implementing CSP (Content Security Policy) headers, input validation using allowlists, and proper HTML escaping of all user-generated content before rendering it in web pages. Additionally, regular security updates and patches should be applied to ensure that all known vulnerabilities in web applications are addressed, as this vulnerability represents a classic example of insufficient input validation that can be prevented through proper security development practices and adherence to secure coding standards.