CVE-2024-57601
📋 TL;DR
A cross-site scripting (XSS) vulnerability in EasyAppointments v1.5.0 allows remote attackers to inject malicious scripts via the legal_settings parameter. This affects all users running the vulnerable version, potentially compromising user sessions and data. Attackers can execute arbitrary JavaScript in victims' browsers.
💻 Affected Systems
- EasyAppointments
📦 What is this software?
Easyappointments by Easyappointments
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal admin credentials, hijack user sessions, deface the application, or redirect users to malicious sites, leading to complete system compromise.
Likely Case
Session hijacking, credential theft, or defacement of the booking interface affecting user trust and data privacy.
If Mitigated
Limited impact with proper input validation and output encoding, potentially only minor UI disruption.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity, especially when unauthenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check the official EasyAppointments repository or vendor for updates. If a patch is released, update to the fixed version following standard upgrade procedures.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation and HTML encoding for the legal_settings parameter to prevent script injection.
Modify source code to sanitize input: htmlspecialchars($legal_settings, ENT_QUOTES, 'UTF-8');
Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to block malicious payloads targeting the legal_settings parameter.
Configure WAF rules to filter <script> tags and JavaScript events in legal_settings parameter.
🧯 If You Can't Patch
- Disable or restrict access to the vulnerable feature if not essential.
- Implement Content Security Policy (CSP) headers to mitigate script execution impact.
🔍 How to Verify
Check if Vulnerable:
Test by injecting a simple XSS payload like <script>alert('XSS')</script> into the legal_settings parameter and check if it executes.Check Version:
Check the version in the EasyAppointments admin panel or review the application's source code/configuration files.Verify Fix Applied:
After applying fixes, retest with XSS payloads to ensure they are properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual or malformed input in legal_settings parameter logs, such as script tags or JavaScript code.
Network Indicators:
- HTTP requests containing suspicious strings like <script> or javascript: in the legal_settings parameter.
SIEM Query:
source="web_logs" AND (legal_settings CONTAINS "<script>" OR legal_settings CONTAINS "javascript:")