CVE-2023-26770
📋 TL;DR
CVE-2023-26770 is an authentication bypass vulnerability in TaskCafe where unauthenticated attackers can reset any user's password by knowing their UserID. This affects all TaskCafe 0.3.2 installations with default configurations. Attackers can gain unauthorized access to user accounts and potentially take over administrative accounts.
💻 Affected Systems
- TaskCafe
📦 What is this software?
Taskcafe by Taskcafe Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all user accounts, including administrative accounts, leading to data theft, system takeover, and potential lateral movement within the network.
Likely Case
Unauthorized access to user accounts, privilege escalation, data manipulation, and potential account takeover for targeted users.
If Mitigated
Limited impact if strong network segmentation, authentication monitoring, and rate limiting are in place, but vulnerability still exists.
🎯 Exploit Status
Exploitation requires only knowledge of a valid UserID and can be performed via simple HTTP requests. The advisory includes technical details that make weaponization straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.3 or later
Vendor Advisory: https://github.com/JordanKnott/taskcafe
Restart Required: Yes
Instructions:
1. Backup your TaskCafe data and configuration. 2. Stop the TaskCafe service. 3. Update to TaskCafe 0.3.3 or later using your package manager or by downloading from GitHub. 4. Restart the TaskCafe service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to TaskCafe instances to only trusted IP addresses or internal networks
Use firewall rules to limit access: iptables -A INPUT -p tcp --dport [TASKCAFE_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [TASKCAFE_PORT] -j DROP
Authentication Proxy
allPlace TaskCafe behind a reverse proxy that requires authentication before reaching the vulnerable application
Configure nginx/apache with authentication: auth_basic 'Restricted'; auth_basic_user_file /etc/nginx/.htpasswd;
🧯 If You Can't Patch
- Immediately disable or take offline all TaskCafe 0.3.2 instances
- Implement strict network segmentation and monitor all authentication attempts to TaskCafe
🔍 How to Verify
Check if Vulnerable:
Check TaskCafe version: if running 0.3.2, it is vulnerable. Test by attempting password reset without authentication using known UserID.Check Version:
Check TaskCafe web interface or configuration files for version information, or use: docker inspect [container_name] | grep -i versionVerify Fix Applied:
Verify version is 0.3.3 or later. Test that unauthenticated password reset attempts now fail with proper authentication errors.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful password reset
- Password reset requests from unauthenticated sessions
- Unusual UserID enumeration patterns in logs
Network Indicators:
- HTTP POST requests to password reset endpoints without authentication headers
- Unusual spikes in authentication-related traffic
SIEM Query:
source="taskcafe.logs" AND (event_type="password_reset" AND user_agent="unauthenticated") OR (http_method="POST" AND uri="/api/password/reset" AND status_code=200)