CVE-2020-23359
📋 TL;DR
This vulnerability in WeBid 1.2.2 allows attackers to bypass password confirmation during user registration due to improper loose comparison. This affects all WeBid installations using the vulnerable version, potentially allowing unauthorized account creation with weak or mismatched passwords.
💻 Affected Systems
- WeBid
📦 What is this software?
Webid by Webidsupport
⚠️ Risk & Real-World Impact
Worst Case
Attackers create administrative accounts with weak passwords, gaining full control over the auction platform to manipulate bids, steal user data, or deface the site.
Likely Case
Malicious users create accounts with intentionally weak passwords that bypass security checks, enabling account takeover or fraudulent activities.
If Mitigated
With proper monitoring and strong password policies, impact is limited to potential account creation anomalies that can be detected and remediated.
🎯 Exploit Status
Exploitation requires access to the registration page, which may be restricted to administrators in some configurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.3 or later
Vendor Advisory: https://github.com/renlok/WeBid/issues/530
Restart Required: No
Instructions:
1. Backup current installation. 2. Download latest WeBid version from official repository. 3. Replace admin/newuser.php with patched version. 4. Verify password comparison uses strict equality (===) instead of loose equality (==).
🔧 Temporary Workarounds
Disable User Registration
linuxTemporarily disable the vulnerable registration endpoint to prevent exploitation.
mv admin/newuser.php admin/newuser.php.disabled
Implement Web Application Firewall Rule
allBlock requests to the vulnerable endpoint using WAF rules.
🧯 If You Can't Patch
- Implement strong password policy enforcement at application layer
- Enable detailed logging for all user registration attempts and monitor for anomalies
🔍 How to Verify
Check if Vulnerable:
Examine admin/newuser.php code for loose comparison (==) instead of strict comparison (===) in password validation logic.Check Version:
grep -i 'version' includes/version.phpVerify Fix Applied:
Test registration with mismatched passwords to ensure proper validation occurs.📡 Detection & Monitoring
Log Indicators:
- Multiple failed registration attempts with mismatched passwords
- Unusual registration patterns from single IP
Network Indicators:
- HTTP POST requests to /admin/newuser.php with password mismatch
SIEM Query:
source="web_logs" url="/admin/newuser.php" method="POST" | search password1!=password2