CVE-2025-62709
📋 TL;DR
ClipBucket v5.5.2 has a host header injection vulnerability that allows attackers to manipulate password reset links. When the base_url configuration isn't set, the application uses the client-controlled HTTP Host header to generate password reset URLs, enabling attackers to redirect victims to malicious domains and capture activation codes. This affects all ClipBucket v5.5.2 installations where base_url is not configured.
💻 Affected Systems
- ClipBucket v5
📦 What is this software?
Clipbucket by Oxygenz
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of any user who requests a password reset, leading to unauthorized access, data theft, and potential privilege escalation if admin accounts are compromised.
Likely Case
Targeted account takeover attacks against specific users, particularly administrators or high-value accounts, resulting in unauthorized access and potential data exposure.
If Mitigated
Limited impact with proper monitoring and user awareness, though the vulnerability still exists and could be exploited if conditions align.
🎯 Exploit Status
Exploitation requires user interaction (victim must click the malicious password reset link and enter activation code), but the technical complexity of crafting the attack is minimal.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.5.2#162
Vendor Advisory: https://github.com/MacWarrior/clipbucket-v5/security/advisories/GHSA-xhhf-mpqr-2cq5
Restart Required: No
Instructions:
1. Update to ClipBucket version 5.5.2#162 or later. 2. Apply the patch from commit 1a93532e665217b5d329808ca78e37e59e9f8a9d. 3. Verify the network.class.php file no longer dynamically builds URLs from the Host header when base_url is not set.
🔧 Temporary Workarounds
Set base_url configuration
allConfigure the base_url setting in ClipBucket's configuration to prevent the application from using the Host header for URL generation.
Edit ClipBucket configuration file and set base_url to your domain (e.g., base_url = 'https://yourdomain.com')
Web server host header validation
linuxConfigure your web server (Apache/Nginx) to validate or override the Host header to prevent malicious values.
For Nginx: add 'server_name yourdomain.com;' and consider using 'if ($host != 'yourdomain.com') { return 444; }'
For Apache: configure VirtualHost with ServerName and consider using mod_rewrite to validate Host header
🧯 If You Can't Patch
- Disable password reset functionality temporarily if not critical
- Implement additional authentication factors for password resets
🔍 How to Verify
Check if Vulnerable:
Check if your ClipBucket version is 5.5.2 and examine network.class.php for dynamic URL building from Host header when base_url is not set.Check Version:
Check ClipBucket version in admin panel or examine version files in the installation directoryVerify Fix Applied:
Verify that after patching, password reset links always use the configured base_url or a validated domain, not the Host header.📡 Detection & Monitoring
Log Indicators:
- Unusual Host header values in HTTP logs
- Password reset requests with suspicious referrers or domains
- Multiple failed password reset attempts from same IP
Network Indicators:
- HTTP requests with manipulated Host headers
- Outbound connections to suspicious domains from password reset functionality
SIEM Query:
source="web_logs" AND (Host!="*yourdomain.com*" OR Host="*") AND uri="*/forget.php*"