CVE-2000-0134 in Check It Out
Summary
by MITRE
The Check It Out shopping cart application allows remote users to modify sensitive purchase information via hidden form fields.
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Analysis
by VulDB Data Team • 04/20/2026
The CVE-2000-0134 vulnerability affects the Check It Out shopping cart application, representing a classic example of insecure direct object references and improper input validation within web applications. This flaw manifests through the manipulation of hidden form fields that typically contain sensitive purchase information such as product IDs, prices, quantities, and order totals. The vulnerability stems from the application's failure to properly validate and sanitize user inputs, particularly those submitted through HTML forms that are intended to be hidden from end users but remain accessible through browser inspection tools or manual request manipulation.
The technical implementation of this vulnerability involves the application's reliance on client-side form field values without adequate server-side validation mechanisms. When users interact with the shopping cart interface, hidden form fields are populated with data that should remain immutable during the transaction process. However, malicious actors can easily modify these fields using browser developer tools, proxy applications, or manual request crafting techniques. This manipulation allows attackers to alter purchase quantities, change product prices, or modify order totals, potentially leading to financial loss for the merchant and unauthorized access to sensitive transaction data.
The operational impact of this vulnerability extends beyond simple price manipulation to encompass broader security implications within e-commerce environments. Attackers can exploit this weakness to perform unauthorized transactions, inflate order values, or even bypass payment validation mechanisms entirely. The vulnerability directly violates several security principles including the principle of least privilege and input validation, as outlined in the CWE (Common Weakness Enumeration) catalog under weakness categories related to improper input validation and insecure direct object references. This type of vulnerability is particularly concerning in financial applications where monetary transactions are processed, as it directly enables financial fraud and data manipulation.
From an attack framework perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK matrix under the 'Initial Access' and 'Execution' phases, specifically relating to 'Web Application Exploitation' and 'Command and Control' activities. The vulnerability enables attackers to manipulate application behavior through web-based interfaces, potentially leading to more sophisticated attacks including session hijacking or data exfiltration. Organizations implementing such shopping cart solutions must consider the broader security implications of client-side data manipulation and implement robust server-side validation controls. The remediation approach should focus on implementing proper input sanitization, server-side validation of all transaction parameters, and the elimination of critical data within client-side form fields. Additionally, implementing proper access controls and session management mechanisms would significantly reduce the attack surface and prevent unauthorized modifications to purchase information.