CVE-2007-4933 in Shop-Script
Summary
by MITRE
Direct static code injection vulnerability in includes/admin/sub/conf_appearence.php in Shop-Script FREE 2.0 and earlier allows remote attackers to inject arbitrary PHP code into cfg/appearence.inc.php via a save_appearence action in admin.php, as demonstrated with the (1) productscount, (2) colscount, and (3) darkcolor parameters.
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Analysis
by VulDB Data Team • 10/07/2024
This vulnerability represents a critical direct static code injection flaw in the Shop-Script FREE e-commerce platform version 2.0 and earlier. The vulnerability exists within the administrative interface where user-supplied parameters are directly incorporated into PHP code without proper sanitization or validation. The specific file affected is includes/admin/sub/conf_appearence.php which processes configuration changes through the admin.php controller. Attackers can exploit this weakness by manipulating the save_appearence action to inject malicious PHP code into the cfg/appearence.inc.php configuration file, effectively allowing remote code execution within the context of the web server.
The technical exploitation occurs through three specific parameters: productscount, colscount, and darkcolor which are all processed without adequate input validation. These parameters are directly written to the configuration file without proper escaping or encoding, creating a classic code injection vector. When an attacker submits malicious input through these parameters, the injected PHP code becomes part of the configuration file and gets executed during subsequent page requests. This type of vulnerability falls under CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and specifically aligns with the ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" and T1505.003 for "Server Software Component: Web Shell" as attackers can establish persistent access through such injection points.
The operational impact of this vulnerability is severe as it provides attackers with complete administrative control over the vulnerable system. Once exploited, attackers can execute arbitrary PHP code, potentially leading to data theft, system compromise, or complete server takeover. The vulnerability affects the entire administrative functionality of the Shop-Script FREE platform, making it impossible to safely manage configuration settings. The attack surface is particularly concerning because the injection occurs during routine administrative operations, making it difficult to detect and distinguish from legitimate configuration changes. This vulnerability enables attackers to maintain persistent access, modify product catalogs, steal customer data, and potentially use the compromised system as a launch point for further attacks within the network infrastructure.
Mitigation strategies should focus on implementing proper input validation and sanitization for all user-supplied parameters. The code must be modified to escape or encode any input before writing to configuration files, and all administrative parameters should undergo strict validation against expected data types and ranges. Implementing a principle of least privilege for the web server process and regular security audits of configuration files can help detect unauthorized modifications. Additionally, the platform should be updated to a patched version that properly handles parameter validation and sanitization. Organizations should also consider implementing web application firewalls to detect and block suspicious parameter values, and establish monitoring procedures to detect unauthorized changes to critical configuration files. The vulnerability demonstrates the importance of input validation in administrative interfaces and the need for comprehensive security testing of all user-controllable parameters within web applications.