CVE-2023-0877
📋 TL;DR
CVE-2023-0877 is a code injection vulnerability in the Froxlor server management panel that allows authenticated attackers to execute arbitrary code on affected systems. This affects all Froxlor installations prior to version 2.0.11. The vulnerability stems from improper input validation in certain administrative functions.
💻 Affected Systems
- froxlor/froxlor
📦 What is this software?
Froxlor by Froxlor
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, data exfiltration, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Unauthorized code execution leading to web server compromise, data manipulation, and potential privilege escalation within the hosting environment.
If Mitigated
Limited impact due to proper network segmentation, minimal user privileges, and active monitoring detecting exploitation attempts.
🎯 Exploit Status
Exploit requires authenticated access. Public proof-of-concept exists in the referenced bounty reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.11
Vendor Advisory: https://github.com/froxlor/froxlor/commit/aa48ffca2bcaf7ae57be3b8147bb3138abdab984
Restart Required: No
Instructions:
1. Backup your Froxlor configuration and database. 2. Update to Froxlor version 2.0.11 or later via package manager or manual installation. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Restrict Administrative Access
linuxLimit Froxlor administrative interface access to trusted IP addresses only
# Configure web server (Apache example)
# In Froxlor virtual host configuration:
<Location /admin>
Require ip 192.168.1.0/24
Require ip 10.0.0.0/8
</Location>
Implement Web Application Firewall
allDeploy WAF rules to detect and block code injection attempts
# ModSecurity rule example
SecRule ARGS "@rx (?:system|exec|shell_exec|passthru)" \
"id:1001,phase:2,deny,status:403,msg:'Possible code injection attempt'"
# Cloudflare WAF: Enable OWASP Core Rule Set
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Froxlor instances from critical systems
- Enforce principle of least privilege for all Froxlor administrative accounts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Froxlor version via web interface or configuration file. Vulnerable if version < 2.0.11Check Version:
grep -i version /var/www/froxlor/lib/version.php || cat /usr/share/froxlor/lib/version.phpVerify Fix Applied:
Confirm version is 2.0.11 or higher and verify the commit aa48ffca2bcaf7ae57be3b8147bb3138abdab984 is present📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Froxlor administrative endpoints
- System command execution from Froxlor process
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Outbound connections from Froxlor server to unexpected destinations
- Unusual traffic patterns from Froxlor administrative interface
SIEM Query:
source="froxlor_access.log" AND (uri_path="/admin/*" AND (method="POST" AND size>10000)) OR (process="php" AND cmdline="*system*" OR cmdline="*exec*" OR cmdline="*shell*"))