CVE-2025-41351
📋 TL;DR
This vulnerability allows attackers to perform a Padding Oracle Attack against Funambol's cloud server, enabling them to decrypt and encrypt parameters used for generating self-signed access URLs. This affects Funambol v30.0.0.20 cloud servers, potentially compromising the confidentiality and integrity of access control mechanisms.
💻 Affected Systems
- Funambol Cloud Server
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of access control mechanisms, allowing unauthorized access to protected resources, data exfiltration, and potential privilege escalation within the cloud environment.
Likely Case
Unauthorized access to thumbnail resources and potentially other protected content, leading to data leakage and privacy violations.
If Mitigated
Limited impact with proper network segmentation and access controls, though cryptographic weaknesses remain exploitable.
🎯 Exploit Status
Padding Oracle Attacks are well-documented and tools exist, though no specific PoC for this CVE is publicly known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/weak-encryption-funambols-cloud-server
Restart Required: Yes
Instructions:
1. Monitor Funambol vendor for security updates. 2. Apply patch when available. 3. Restart affected services.
🔧 Temporary Workarounds
Disable thumbnail functionality
allTemporarily disable the vulnerable thumbnail display URL feature
# Configuration change in Funambol settings - consult documentation
Implement WAF rules
allBlock padding oracle attack patterns at the web application firewall
# WAF-specific rules to detect padding oracle patterns
🧯 If You Can't Patch
- Isolate affected servers behind strict network segmentation
- Implement rate limiting and monitoring for unusual access patterns to thumbnail URLs
🔍 How to Verify
Check if Vulnerable:
Check if running Funambol v30.0.0.20 and examine thumbnail URL encryption implementationCheck Version:
# Check Funambol version in administration console or configuration filesVerify Fix Applied:
Verify updated version and test thumbnail URL encryption resistance to padding oracle attacks📡 Detection & Monitoring
Log Indicators:
- Multiple failed decryption attempts
- Unusual access patterns to thumbnail URLs
- Repeated requests with modified encrypted parameters
Network Indicators:
- High volume of requests to thumbnail endpoints
- Patterns consistent with padding oracle attacks
SIEM Query:
source="funambol" AND (url="*thumbnail*" OR status=500) | stats count by src_ip