CVE-2022-3942: Sanitization Management System XSS Flaw

CVE-2022-3942 Overview

A Cross-Site Scripting (XSS) vulnerability was identified in SourceCodester Sanitization Management System. This issue affects the processing of the file php-sms/?p=request_quote, where improper input handling allows manipulation that leads to cross-site scripting attacks. The vulnerability can be initiated remotely and has been assigned the identifier VDB-213449.

Critical Impact

Remote attackers can inject malicious scripts into web pages viewed by other users, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated users.

Affected Products

• SourceCodester Sanitization Management System (all versions)
• Deployments using the php-sms/?p=request_quote endpoint
• Web applications built on the Sanitization Management System codebase

Discovery Timeline

• 2022-11-11 - CVE-2022-3942 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-3942

Vulnerability Analysis

This vulnerability is classified as a Cross-Site Scripting (XSS) flaw (CWE-79) with an additional weakness in improper neutralization of special elements (CWE-707). The vulnerable endpoint php-sms/?p=request_quote fails to properly sanitize user-supplied input before rendering it in the web page context. This allows attackers to inject arbitrary JavaScript code that executes in the browser of any user who accesses the affected page.

The attack requires user interaction, as victims must navigate to or be directed to a malicious link containing the XSS payload. However, since no authentication is required to exploit this vulnerability and the attack can be performed over the network, it presents a moderate risk to organizations using this software.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the request quote functionality. The application fails to implement proper neutralization of special elements used in web page rendering, allowing user-controlled data to be interpreted as executable script content rather than plain text.

Attack Vector

The attack vector is network-based, requiring no privileges on the target system. An attacker crafts a malicious URL containing JavaScript payloads targeting the php-sms/?p=request_quote endpoint. When a victim clicks the link or is redirected to the malicious URL, the injected script executes within the context of the victim's browser session.

Typical attack scenarios include:

• Phishing campaigns directing users to crafted URLs
• Session token theft through JavaScript-based cookie exfiltration
• Defacement of the application interface for targeted users
• Delivery of additional malicious payloads through script injection

The vulnerability does not require authentication, making it accessible to unauthenticated remote attackers. User interaction is required as the victim must access the malicious URL for the attack to succeed.

Detection Methods for CVE-2022-3942

Indicators of Compromise

• Unusual HTTP requests to the php-sms/?p=request_quote endpoint containing JavaScript or HTML tags
• Web server logs showing encoded script tags (%3Cscript%3E) in URL parameters
• Reports of unexpected browser behavior or pop-ups when accessing the Sanitization Management System
• Anomalous outbound connections from client browsers after accessing the application

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in request parameters
• Monitor web server access logs for requests containing common XSS patterns such as <script>, javascript:, or event handlers like onerror
• Deploy browser-based Content Security Policy (CSP) violation reporting to identify injection attempts
• Utilize intrusion detection systems (IDS) with signatures for XSS attack patterns targeting PHP applications

Monitoring Recommendations

• Enable detailed logging on the web server for the php-sms/ application path
• Configure alerts for high-volume or suspicious requests to the request_quote functionality
• Implement real-time monitoring for JavaScript injection patterns in HTTP request parameters
• Review application logs regularly for error messages that may indicate exploitation attempts

How to Mitigate CVE-2022-3942

Immediate Actions Required

• Review and restrict access to the Sanitization Management System to trusted networks only
• Implement a Web Application Firewall (WAF) with XSS protection rules in front of the application
• Consider disabling the request_quote functionality if not business-critical until a patch is available
• Educate users about the risks of clicking on untrusted links that target the application

Patch Information

At the time of publication, no official vendor patch information is available in the CVE data. Organizations should monitor the VulDB Advisory and Zero Day Initiative Advisory ZDI-22-532 for updates regarding security patches or recommended remediations from the vendor.

Workarounds

• Deploy input validation filters at the application or WAF level to sanitize user input before processing
• Implement Content Security Policy (CSP) headers to prevent inline script execution
• Apply HTML output encoding to all user-controlled data rendered in web pages
• Restrict access to the application using network-level controls such as IP whitelisting or VPN requirements

# Example Apache configuration to add basic XSS protection headers
<IfModule mod_headers.c>
    Header set X-XSS-Protection "1; mode=block"
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
    Header set X-Content-Type-Options "nosniff"
</IfModule>