CVE-2017-8833 in Zen Cart
Summary
by MITRE
Zen Cart 1.6.0 has XSS in the main_page parameter to index.php. NOTE: 1.6.0 is not an official release but the vendor's README.md file offers a link to v160.zip with a description of "Download latest in-development version from github."
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/06/2022
The vulnerability identified as CVE-2017-8833 represents a cross-site scripting flaw discovered in Zen Cart version 1.6.0, which despite being labeled as an in-development release contains critical security implications. This particular version of the e-commerce platform, while not officially sanctioned, was made available through the vendor's official channels, creating a scenario where developers and administrators might unknowingly deploy vulnerable code. The vulnerability manifests specifically within the main_page parameter of the index.php script, which serves as the primary entry point for the application's navigation system. The XSS vulnerability arises from insufficient input validation and output sanitization mechanisms that fail to properly escape or encode user-supplied data before it is rendered in the application's response. This flaw allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to session hijacking, credential theft, or unauthorized administrative actions.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing a payload in the main_page parameter, which is then processed by the vulnerable Zen Cart application. The application fails to validate or sanitize the input before incorporating it into the page output, creating an environment where JavaScript code can execute in the context of other users' browsers. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, and represents a classic case of improper input validation where user-controllable parameters are directly embedded into web responses without adequate sanitization. The attack vector is particularly concerning as it leverages the core navigation mechanism of the application, making it accessible through normal browsing behavior rather than requiring specialized attack techniques. The vulnerability's impact extends beyond simple script injection, as it can be combined with other techniques to escalate privileges, steal cookies, or redirect users to malicious sites.
The operational impact of CVE-2017-8833 is significant for any organization running the vulnerable Zen Cart version, as it creates a persistent threat vector that can be exploited by attackers with minimal technical expertise. The vulnerability affects not only end users but also administrators who might unknowingly navigate to maliciously crafted URLs, potentially compromising their sessions and gaining unauthorized access to sensitive administrative functions. The in-development nature of version 1.6.0 does not diminish the risk, as organizations often deploy pre-release software for testing or development purposes, inadvertently exposing themselves to known vulnerabilities. This vulnerability aligns with ATT&CK technique T1566 which covers phishing with malicious attachments or links, and could be leveraged as part of broader attack campaigns targeting e-commerce platforms. The risk is compounded by the fact that the vulnerability exists in a widely used e-commerce platform, making it an attractive target for threat actors seeking to compromise online retail operations and potentially gain access to customer data and payment information.
Mitigation strategies for CVE-2017-8833 should focus on immediate remediation through patching or code modification, as well as implementing additional defensive measures. Organizations should prioritize updating to a patched version of Zen Cart or applying the appropriate security fixes to sanitize input parameters before they are processed. The implementation of Content Security Policy headers can provide an additional layer of protection against script execution, while input validation should be strengthened to ensure all user-supplied data is properly escaped or encoded before being rendered in web responses. Organizations should also consider implementing web application firewalls to detect and block malicious payloads targeting this vulnerability, and establish monitoring procedures to identify potentially malicious navigation patterns. The vulnerability demonstrates the importance of validating all input parameters, particularly those used for application navigation, and aligns with security best practices outlined in OWASP Top Ten and NIST cybersecurity frameworks. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other components of the web application stack, as this vulnerability highlights the need for comprehensive security testing throughout the software development lifecycle.