CVE-2023-32692
📋 TL;DR
CVE-2023-32692 is a critical remote code execution vulnerability in CodeIgniter's Validation library. Attackers can execute arbitrary PHP code by exploiting validation placeholders in form validation rules. All CodeIgniter 4 applications using validation features are affected.
💻 Affected Systems
- CodeIgniter 4
📦 What is this software?
Codeigniter by Codeigniter
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to execute arbitrary code, access sensitive data, install malware, or pivot to other systems.
Likely Case
Web application takeover leading to data theft, defacement, or use as a foothold for further attacks.
If Mitigated
Limited impact if proper input validation and output encoding are already implemented elsewhere in the application.
🎯 Exploit Status
Exploitation requires user input to reach vulnerable validation code, which is common in web applications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.5
Vendor Advisory: https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-m6m8-6gq8-c9fj
Restart Required: No
Instructions:
1. Update CodeIgniter to version 4.3.5 or later using Composer: composer require codeigniter4/framework:^4.3.5
2. Verify the update completed successfully
3. Test application functionality after update
🔧 Temporary Workarounds
Disable validation placeholders
allTemporarily disable or avoid using validation placeholders in your application code
Input sanitization wrapper
allImplement additional input sanitization before validation occurs
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block suspicious validation-related requests
- Restrict network access to vulnerable applications and implement strict input validation
🔍 How to Verify
Check if Vulnerable:
Check if CodeIgniter version is below 4.3.5 and if validation features are usedCheck Version:
composer show codeigniter4/framework | grep versionVerify Fix Applied:
Verify CodeIgniter version is 4.3.5 or higher and test validation functionality📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to validation endpoints
- Suspicious PHP code in validation-related parameters
- Error logs showing validation failures with unusual input
Network Indicators:
- HTTP requests containing PHP code snippets in validation parameters
- Unusual traffic patterns to validation endpoints
SIEM Query:
source="web_logs" AND (uri="*validation*" OR uri="*validate*") AND (param="*{*" OR param="*}*")🔗 References
- https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md
- https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-m6m8-6gq8-c9fj
- https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md
- https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-m6m8-6gq8-c9fj
