CVE-2024-53459
📋 TL;DR
Sysax Multi Server 6.99 contains a cross-site scripting vulnerability in the /scgi?sid parameter that allows attackers to inject malicious scripts into web pages. This affects organizations using the vulnerable version of Sysax Multi Server for file transfer and automation. Attackers could execute arbitrary JavaScript in the context of authenticated users' browsers.
💻 Affected Systems
- Sysax Multi Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on client systems.
Likely Case
Session hijacking leading to unauthorized access to file transfer systems and potential data exfiltration.
If Mitigated
Limited impact with proper input validation and output encoding in place.
🎯 Exploit Status
Exploitation requires user interaction (clicking a malicious link) but the XSS payload is straightforward to craft.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block XSS payloads in the /scgi?sid parameter
Input Validation Filter
windowsAdd input validation to sanitize the sid parameter before processing
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers
- Restrict access to the Sysax web interface using network segmentation
🔍 How to Verify
Check if Vulnerable:
Test by injecting basic XSS payloads into the /scgi?sid parameter and observing if they executeCheck Version:
Check Sysax Multi Server version in the application interface or installation directoryVerify Fix Applied:
Verify that XSS payloads in the sid parameter are properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual length or character patterns in sid parameter values
- Multiple failed XSS attempts in web logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in sid parameter
- Unusual traffic patterns to /scgi endpoint
SIEM Query:
web.url:*scgi* AND (web.param.sid:*script* OR web.param.sid:*javascript* OR web.param.sid:*onerror*)