CVE-2021-3850
📋 TL;DR
CVE-2021-3850 is an authentication bypass vulnerability in ADOdb database abstraction library versions prior to 5.20.21. Attackers can bypass authentication mechanisms in applications using vulnerable ADOdb versions, potentially gaining unauthorized access to databases and application data. This affects any application using ADOdb for database connectivity with authentication features.
💻 Affected Systems
- ADOdb database abstraction library
📦 What is this software?
Adodb by Adodb Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through unauthorized administrative access to databases, leading to data theft, data manipulation, or full application takeover.
Likely Case
Unauthorized access to application data, privilege escalation, and potential data exfiltration from affected databases.
If Mitigated
Limited impact with proper network segmentation, strong authentication layers, and monitoring in place.
🎯 Exploit Status
Exploit details are publicly available in the GitHub commit and security advisories. The vulnerability is in authentication logic, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.20.21 and later
Vendor Advisory: https://github.com/adodb/adodb/commit/952de6c4273d9b1e91c2b838044f8c2111150c29
Restart Required: No
Instructions:
1. Update ADOdb to version 5.20.21 or later. 2. Replace the adodb directory in your application with the updated version. 3. Test authentication functionality to ensure no regression.
🔧 Temporary Workarounds
Implement additional authentication layer
allAdd application-level authentication checks independent of ADOdb's authentication
Network access restrictions
linuxRestrict database access to only trusted application servers
iptables -A INPUT -p tcp --dport 3306 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block authentication bypass attempts
- Enable detailed logging of all authentication attempts and monitor for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Check the ADOdb version in your application's codebase or via composer show adodb/adodbCheck Version:
composer show adodb/adodb | grep version OR check adodb/version.txt in the installation directoryVerify Fix Applied:
Verify the ADOdb version is 5.20.21 or higher and test authentication functionality📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login from same IP
- Authentication logs showing successful login without proper credentials
- Unusual database queries from unexpected user accounts
Network Indicators:
- Unusual database connection patterns
- Authentication requests bypassing normal application flow
SIEM Query:
source="application_logs" AND ("authentication bypass" OR "invalid credentials" AND "successful login")🔗 References
- https://github.com/adodb/adodb/commit/952de6c4273d9b1e91c2b838044f8c2111150c29
- https://huntr.dev/bounties/bdf5f216-4499-4225-a737-b28bc6f5801c
- https://lists.debian.org/debian-lts-announce/2022/02/msg00006.html
- https://www.debian.org/security/2022/dsa-5101
- https://github.com/adodb/adodb/commit/952de6c4273d9b1e91c2b838044f8c2111150c29
- https://huntr.dev/bounties/bdf5f216-4499-4225-a737-b28bc6f5801c
- https://lists.debian.org/debian-lts-announce/2022/02/msg00006.html
- https://www.debian.org/security/2022/dsa-5101
