CVE-2024-22259
📋 TL;DR
Spring Framework applications using UriComponentsBuilder to parse external URLs with host validation are vulnerable to open redirect and SSRF attacks. Attackers can manipulate URLs to bypass validation and redirect users to malicious sites or access internal resources. This affects any Spring application that processes user-provided URLs with host validation checks.
💻 Affected Systems
- Spring Framework
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full SSRF allowing internal network reconnaissance, data exfiltration, or internal service compromise via crafted URLs that bypass host validation.
Likely Case
Open redirect attacks where users are tricked into visiting malicious sites, potentially leading to phishing, credential theft, or malware distribution.
If Mitigated
Limited impact with proper input validation, URL allowlisting, and network segmentation preventing internal resource access.
🎯 Exploit Status
Exploitation requires user-provided URL input and host validation logic. Similar to CVE-2024-22243 with different input vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Spring Framework 6.1.5, 6.0.18, 5.3.33
Vendor Advisory: https://spring.io/security/cve-2024-22259
Restart Required: Yes
Instructions:
1. Identify Spring Framework version. 2. Update to patched version via package manager or manual download. 3. Rebuild and redeploy application. 4. Restart application server.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict URL validation before parsing with UriComponentsBuilder, including scheme validation and host allowlisting.
Network Controls
allImplement outbound firewall rules to restrict application server access to external networks and internal resources.
🧯 If You Can't Patch
- Implement strict input validation with allowlisted domains only
- Deploy WAF rules to block suspicious URL patterns and redirect attempts
🔍 How to Verify
Check if Vulnerable:
Check if application uses UriComponentsBuilder to parse external URLs with host validation. Review code for UriComponentsBuilder usage in URL parsing contexts.Check Version:
Check pom.xml for Spring version or run: java -cp spring-core.jar org.springframework.core.SpringVersionVerify Fix Applied:
Verify Spring Framework version is 6.1.5+, 6.0.18+, or 5.3.33+. Test URL parsing with malicious inputs to confirm validation works.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect patterns
- URL parsing errors with malformed URLs
- Outbound requests to unexpected domains
Network Indicators:
- HTTP 302/301 redirects to external domains
- Outbound requests from application server to internal resources
SIEM Query:
source="app_logs" AND (url_parse_error OR redirect_to_external_domain)