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The vulnerability in WBCE CMS version 1.6.4 is a flaw in its brute-force protection mechanism. The application tracks failed login attempts per IP address to lock out attackers after too many guesses. However, it uses the HTTP `X-Forwarded-For` header to determine the client’s IP address. This header is controllable by the user making the request. An attacker can bypass the counter by sending a new, unique value in the `X-Forwarded-For` header with each login attempt. The system mistakenly interprets each request as coming from a different IP address. Consequently, the failure counter for any single IP never reaches the lockout threshold. This grants the attacker an unlimited number of password guessing attempts. The core issue is that the application fully trusts this user-supplied header without any validation, filtering, or restriction on its use for security functions. Effectively, all built-in brute-force protection is rendered useless, allowing for systematic attacks on user credentials.
Platform: WBCE CMS
Version: 1.6.4
Vulnerability: Brute-force bypass
Severity: Medium
Date: 2025-12-08
Prediction: 2025-12-15
What Undercode Say:
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for i in {1..1000}; do
curl -X POST https://target/login.php \
-H "X-Forwarded-For: 192.168.1.$i" \
-d "username=admin&password=guess$i"
done
Check if header is trusted curl -I -H "X-Forwarded-For: 10.0.0.1" https://target/
How Exploit:
1. Target login endpoint.
2. Automate requests with incremental `X-Forwarded-For`.
3. Use password list.
4. Continue until success.
Protection from this CVE:
1. Upgrade to v1.6.5.
2. Validate `X-Forwarded-For` header.
3. Use actual client IP.
4. Implement session-based rate-limiting.
Impact:
1. Unauthorized admin access.
2. User account compromise.
3. Full site takeover.
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Sources:
Reported By: nvd.nist.gov
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