CVE-2023-46817
📋 TL;DR
CVE-2023-46817 is a PHP object injection vulnerability in phpFox that allows remote, unauthenticated attackers to execute arbitrary PHP code by exploiting improper input sanitization in the redirect route. This affects all phpFox installations before version 4.8.14. Attackers can achieve remote code execution with a single HTTP request.
💻 Affected Systems
- phpFox
📦 What is this software?
Phpfox by Phpfox
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, access/modify all data, install backdoors, and pivot to other systems.
Likely Case
Remote code execution leading to website defacement, data theft, or deployment of malware/backdoors.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and input validation are in place, though risk remains high.
🎯 Exploit Status
Public proof-of-concept code exists and exploitation requires minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.8.14
Vendor Advisory: https://docs.phpfox.com/display/FOX4MAN/phpFox+4.8.14
Restart Required: No
Instructions:
1. Backup your phpFox installation and database. 2. Download phpFox 4.8.14 from official sources. 3. Replace all files with the patched version. 4. Clear any caches. 5. Verify the patch is applied by checking the version.
🔧 Temporary Workarounds
WAF Rule Blocking
allBlock requests to /core/redirect with suspicious parameters using web application firewall rules.
# Example ModSecurity rule: SecRule REQUEST_URI "@streq /core/redirect" "id:1001,phase:1,deny,status:403"
Route Disabling
linuxTemporarily disable or restrict access to the vulnerable /core/redirect endpoint.
# Apache: RewriteRule ^core/redirect - [F]
# Nginx: location ~ ^/core/redirect { return 403; }
🧯 If You Can't Patch
- Implement strict network segmentation to isolate phpFox instances from critical systems
- Deploy web application firewall with rules specifically blocking exploitation patterns for this CVE
🔍 How to Verify
Check if Vulnerable:
Check if phpFox version is below 4.8.14 by examining version files or admin panel. Test with known safe payloads if authorized.Check Version:
grep -r "version\|VERSION" /path/to/phpfox/ | grep -i "4\.[0-7]\|4\.8\.[0-9]\|4\.8\.1[0-3]"Verify Fix Applied:
Confirm version is 4.8.14 or higher. Test that /core/redirect endpoint properly sanitizes input and rejects malicious serialized objects.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /core/redirect with serialized PHP objects in parameters
- Unusual PHP errors related to unserialize() function
- Suspicious POST/GET parameters containing O: or C: patterns
Network Indicators:
- HTTP traffic to /core/redirect endpoint with encoded/serialized data
- Unusual outbound connections from phpFox server post-exploitation
SIEM Query:
source="web_logs" AND uri="/core/redirect" AND (param="url" AND value MATCHES "O:[0-9]+:" OR value MATCHES "C:[0-9]+:")🔗 References
- http://seclists.org/fulldisclosure/2023/Oct/30
- https://docs.phpfox.com/display/FOX4MAN/phpFox+4.8.14
- https://karmainsecurity.com/KIS-2023-12
- https://karmainsecurity.com/pocs/CVE-2023-46817.php
- https://www.phpfox.com/blog/
- http://seclists.org/fulldisclosure/2023/Oct/30
- https://docs.phpfox.com/display/FOX4MAN/phpFox+4.8.14
- https://karmainsecurity.com/KIS-2023-12
- https://karmainsecurity.com/pocs/CVE-2023-46817.php
- https://www.phpfox.com/blog/
