CVE-2023-6429 in Online Invoicing System
Summary
by MITRE • 11/30/2023
A vulnerability has been discovered in BigProf Online Invoicing System 2.6, which does not sufficiently encode user-controlled input, resulting in persistent XSS through /invoicing/app/clients_view.php, in the FirstRecord parameter. Exploitation of this vulnerability could allow an attacking user to store dangerous JavaScript payloads on the system that will be triggered when the page loads.
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Analysis
by VulDB Data Team • 12/21/2023
The vulnerability identified as CVE-2023-6429 represents a critical persistent cross-site scripting flaw within the BigProf Online Invoicing System version 2.6. This security weakness specifically manifests in the /invoicing/app/clients_view.php script where the FirstRecord parameter fails to properly sanitize or encode user-supplied input. The vulnerability stems from inadequate input validation and output encoding mechanisms that allow malicious actors to inject arbitrary JavaScript code into the application's data handling processes. When legitimate users access the affected page, the stored malicious payloads execute within their browser context, creating a persistent threat that can affect multiple users over time.
The technical exploitation of this vulnerability follows a standard XSS attack pattern where an attacker crafts malicious input containing JavaScript code and submits it through the vulnerable FirstRecord parameter. The application stores this input without proper sanitization and subsequently displays it without adequate encoding, allowing the JavaScript to execute in the victim's browser. This persistent nature means that once the malicious payload is stored in the system, it will automatically execute whenever the affected page is loaded by any user with appropriate permissions to view client records. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, and aligns with ATT&CK technique T1566.001 for initial access through malicious content.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform various malicious activities including session hijacking, credential theft, redirection to malicious sites, and data exfiltration. An attacker could potentially establish persistent access to the invoicing system by injecting scripts that capture user credentials or manipulate the application's functionality. The vulnerability affects the confidentiality, integrity, and availability of the system by enabling unauthorized access to sensitive financial data and potentially compromising the entire invoicing workflow. Organizations using this version of the BigProf system face significant risk of data breaches and unauthorized system manipulation.
Mitigation strategies for CVE-2023-6429 should focus on immediate input validation and output encoding implementation across all user-controllable parameters. The most effective remediation involves applying proper HTML encoding to all user-supplied data before rendering it in the application interface, implementing Content Security Policy headers to restrict script execution, and conducting comprehensive input validation to reject suspicious payloads. Organizations should also implement regular security updates and patches from the vendor, as well as perform thorough input sanitization across all application components that handle user data. Additionally, network monitoring should be enhanced to detect and alert on suspicious script injection patterns, and user access controls should be reviewed to limit the scope of potential exploitation. The vulnerability demonstrates the critical importance of maintaining proper input/output encoding practices and adheres to security standards such as OWASP Top Ten A03:2021 for Injection vulnerabilities and NIST SP 800-171 requirements for secure software development practices.