CVE-2024-39573
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in Apache HTTP Server's mod_rewrite module. Attackers can exploit unsafe RewriteRules to redirect requests through mod_proxy to arbitrary internal or external URLs. This affects Apache HTTP Server versions 2.4.59 and earlier.
💻 Affected Systems
- Apache HTTP Server
📦 What is this software?
Ontap by Netapp
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or use the server as a proxy for attacks against other systems.
Likely Case
Unauthorized access to internal network resources, potential data leakage from backend systems.
If Mitigated
Limited impact if proper network segmentation and RewriteRule validation are in place.
🎯 Exploit Status
Exploitation requires specific RewriteRule configurations that allow URL manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.60
Vendor Advisory: https://httpd.apache.org/security/vulnerabilities_24.html
Restart Required: Yes
Instructions:
1. Download Apache HTTP Server 2.4.60 or later from the official website. 2. Stop the Apache service. 3. Install the new version following your OS package manager or compilation instructions. 4. Restart the Apache service.
🔧 Temporary Workarounds
Review and secure RewriteRules
allAudit all RewriteRules to ensure they don't allow arbitrary URL proxying through mod_proxy.
Review .htaccess files and Apache configuration for RewriteRule directives
Disable mod_proxy if unused
allRemove or comment out mod_proxy loading if not required for your configuration.
Comment out 'LoadModule proxy_module modules/mod_proxy.so' in httpd.conf
🧯 If You Can't Patch
- Implement strict network segmentation to limit Apache server access to internal resources
- Deploy a web application firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check Apache version and review RewriteRule configurations for unsafe patterns that could proxy requests.Check Version:
httpd -vVerify Fix Applied:
Confirm Apache version is 2.4.60 or later and test that RewriteRules no longer allow unauthorized proxying.📡 Detection & Monitoring
Log Indicators:
- Unusual proxy requests in access logs
- Requests to internal IPs from external sources
Network Indicators:
- Unexpected outbound connections from Apache server to internal systems
SIEM Query:
source="apache_access" AND (uri CONTAINS "proxy" OR dest_ip IN [internal_ranges])🔗 References
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20240712-0001/
- http://seclists.org/fulldisclosure/2024/Oct/11
- http://www.openwall.com/lists/oss-security/2024/07/01/11
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20240712-0001/
