CVE-2024-42330
📋 TL;DR
This CVE describes a JavaScript string encoding vulnerability in the HttpRequest object that allows attackers to create specially crafted strings that can access hidden object properties. This affects web applications using vulnerable versions of the affected software. Attackers can potentially bypass security controls and access sensitive data.
💻 Affected Systems
- Zabbix
📦 What is this software?
Zabbix by Zabbix
Zabbix by Zabbix
Zabbix by Zabbix
Zabbix by Zabbix
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through privilege escalation, data exfiltration, or remote code execution by accessing internal object properties.
Likely Case
Information disclosure, session hijacking, or limited privilege escalation within the application context.
If Mitigated
Limited impact with proper input validation and output encoding controls in place.
🎯 Exploit Status
Exploitation requires understanding of JavaScript object internals and ability to craft malicious HTTP responses.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Zabbix advisory ZBX-25626 for specific patched versions
Vendor Advisory: https://support.zabbix.com/browse/ZBX-25626
Restart Required: Yes
Instructions:
1. Review Zabbix advisory ZBX-25626. 2. Upgrade to patched version. 3. Restart Zabbix services. 4. Verify fix implementation.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation and output encoding for all HTTP response headers
Web Application Firewall Rules
allDeploy WAF rules to detect and block malicious HTTP header manipulation attempts
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers
- Isolate vulnerable systems behind reverse proxies with header sanitization
🔍 How to Verify
Check if Vulnerable:
Check Zabbix version against advisory ZBX-25626. Test with crafted HTTP responses to see if JavaScript can access hidden properties.Check Version:
zabbix_server --version or check web interface About pageVerify Fix Applied:
Verify Zabbix version is updated to patched release. Test that malicious HTTP headers no longer allow access to hidden object properties.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP header patterns
- JavaScript errors related to object property access
- Unexpected string encoding in logs
Network Indicators:
- Malformed HTTP headers in responses
- Unusual Content-Type or encoding headers
SIEM Query:
source="zabbix" AND (http_header="*[malicious pattern]*" OR error="*property access*" OR error="*encoding*" )