CVE-2022-0666
📋 TL;DR
This CVE describes a CRLF injection vulnerability in Microweber CMS that allows attackers to inject carriage return and line feed characters into HTTP headers. This can lead to stack trace exposure, potentially revealing sensitive system information. Users running Microweber versions prior to 1.2.11 are affected.
💻 Affected Systems
- Microweber CMS
📦 What is this software?
Microweber by Microweber
⚠️ Risk & Real-World Impact
Worst Case
Attackers could expose sensitive stack trace information containing system paths, configuration details, or internal error messages that could aid further attacks.
Likely Case
Information disclosure through exposed stack traces revealing internal application structure and potential debugging information.
If Mitigated
Minimal impact with proper input validation and error handling preventing information leakage.
🎯 Exploit Status
CRLF injection vulnerabilities are well-understood and easy to exploit with basic web testing tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.11
Vendor Advisory: https://github.com/microweber/microweber/commit/f0e338f1b7dc5ec9d99231f4ed3fa6245a5eb128
Restart Required: No
Instructions:
1. Update Microweber to version 1.2.11 or later. 2. Apply the security patch from the GitHub commit. 3. Verify the fix by testing CRLF injection attempts.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side filtering for CRLF characters in HTTP headers
Implement input validation to filter \r and \n characters from user-supplied header values
Error Handling Configuration
allConfigure application to suppress detailed error messages in production
Set display_errors = Off in PHP configuration
Configure custom error pages
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with CRLF injection detection rules
- Restrict access to vulnerable endpoints using network segmentation or authentication
🔍 How to Verify
Check if Vulnerable:
Test by sending HTTP requests with CRLF sequences (\r\n) in headers to the application and check if stack traces are exposed in responses.Check Version:
Check Microweber version in admin panel or via composer show microweber/microweberVerify Fix Applied:
Attempt the same CRLF injection tests after patching; successful fix should return generic error messages without stack traces.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests containing CRLF sequences
- Stack trace exposures in error logs
- Multiple 500 error responses
Network Indicators:
- HTTP requests with %0D%0A or \r\n sequences in headers
- Responses containing PHP stack traces
SIEM Query:
source=web_logs (header="*\r\n*" OR header="*%0D%0A*") OR response="*stack trace*"🔗 References
- https://github.com/microweber/microweber/commit/f0e338f1b7dc5ec9d99231f4ed3fa6245a5eb128
- https://huntr.dev/bounties/7215afc7-9133-4749-8e8e-0569317dbd55
- https://github.com/microweber/microweber/commit/f0e338f1b7dc5ec9d99231f4ed3fa6245a5eb128
- https://huntr.dev/bounties/7215afc7-9133-4749-8e8e-0569317dbd55
