CVE-2024-45522
📋 TL;DR
This vulnerability allows attackers to reset passwords for any user account by exploiting insufficient domain validation in the password reset functionality. Attackers can send password reset requests to arbitrary domains instead of the legitimate linen.dev domains, potentially leading to account takeover. All users of Linen before the fix are affected.
💻 Affected Systems
- Linen
📦 What is this software?
Linen by Linen
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of any user, including administrators, leading to data theft, privilege escalation, and potential compromise of the entire Linen platform.
Likely Case
Targeted account takeover of specific users through phishing or social engineering, resulting in unauthorized access to sensitive conversations and data.
If Mitigated
Limited impact with proper monitoring and user awareness, but still represents a significant authentication bypass vulnerability.
🎯 Exploit Status
The vulnerability is simple to exploit by modifying HTTP requests to the password reset endpoint with arbitrary domains.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit cd37c3e88ec29f4e7baae7e32fe80d0137848d10
Vendor Advisory: https://github.com/Linen-dev/linen.dev/commit/cd37c3e88ec29f4e7baae7e32fe80d0137848d10
Restart Required: Yes
Instructions:
1. Update to commit cd37c3e or later. 2. Deploy the updated code. 3. Restart the web application service. 4. Verify the fix by testing password reset functionality.
🔧 Temporary Workarounds
Disable password reset endpoint
allTemporarily disable the vulnerable API endpoint until patching is complete.
# Modify web server configuration to block /api/forgot-password
# Or implement middleware to reject requests to this endpoint
Implement WAF rules
allAdd web application firewall rules to block requests with non-whitelisted domains in password reset requests.
# Example WAF rule: Block requests to /api/forgot-password with domain != linen.dev or www.linen.dev
🧯 If You Can't Patch
- Implement strict domain validation at the application layer before the vulnerable code executes
- Enable multi-factor authentication for all users to reduce impact of password reset attacks
🔍 How to Verify
Check if Vulnerable:
Test the password reset endpoint by sending a request with a domain parameter set to a non-linen.dev value and check if it processes the request.Check Version:
git log --oneline -1 # Check if commit cd37c3e or later is presentVerify Fix Applied:
Attempt the same test with non-linen.dev domains and verify requests are rejected with proper domain validation.📡 Detection & Monitoring
Log Indicators:
- Unusual password reset requests with non-standard domains
- Multiple failed login attempts following password reset requests
- Password reset requests from unexpected IP addresses
Network Indicators:
- HTTP POST requests to /api/forgot-password with domain parameters not matching linen.dev patterns
- Unusual traffic patterns to password reset endpoint
SIEM Query:
source="web_logs" AND uri_path="/api/forgot-password" AND (NOT domain="linen.dev" AND NOT domain="www.linen.dev")