CVE-2023-28854
📋 TL;DR
CVE-2023-28854 is a command injection vulnerability in the nophp PHP framework that allows attackers to execute arbitrary shell commands on the web server. This affects all users running nophp versions prior to 0.0.1. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- nophp PHP framework
📦 What is this software?
Nophp by Nophp Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining shell access as the httpd user, allowing data theft, installation of malware, lateral movement, and complete server takeover.
Likely Case
Remote code execution leading to web server compromise, data exfiltration, and potential use as a foothold for further attacks.
If Mitigated
Limited impact with proper input validation and command sanitization in place, potentially preventing successful exploitation.
🎯 Exploit Status
Command injection vulnerabilities typically have low exploitation complexity when unauthenticated access is possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.0.1 or later
Vendor Advisory: https://github.com/paijp/nophp/security/advisories/GHSA-9858-q3c2-9wwm
Restart Required: No
Instructions:
1. Update to nophp version 0.0.1 or later. 2. Alternatively, apply the patch from commit e5409aa2d441789cbb35f6b119bef97ecc3986aa to index.php. 3. Verify the fix by checking the updated code.
🔧 Temporary Workarounds
Apply env_patchsample230330.php workaround
allAdd the env_patchsample230330.php function to env.php as a temporary mitigation
Copy env_patchsample230330.php function from advisory and add to env.php
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Restrict web server permissions and implement least privilege principles
🔍 How to Verify
Check if Vulnerable:
Check if running nophp version prior to 0.0.1 or if index.php lacks the patch from commit e5409aa2d441789cbb35f6b119bef97ecc3986aaCheck Version:
Check nophp version in framework files or deployment configurationVerify Fix Applied:
Verify index.php contains the patch from commit e5409aa2d441789cbb35f6b119bef97ecc3986aa or version is 0.0.1+📡 Detection & Monitoring
Log Indicators:
- Unusual shell commands in web server logs
- Suspicious process execution from web user
- Unexpected system calls
Network Indicators:
- Unusual outbound connections from web server
- Command and control traffic patterns
SIEM Query:
web_server_logs WHERE process_execution LIKE '%shell%' OR command LIKE '%cmd%' FROM httpd_user🔗 References
- https://github.com/paijp/nophp/commit/e5409aa2d441789cbb35f6b119bef97ecc3986aa
- https://github.com/paijp/nophp/releases/tag/v0.0.1
- https://github.com/paijp/nophp/security/advisories/GHSA-9858-q3c2-9wwm
- https://github.com/paijp/nophp/commit/e5409aa2d441789cbb35f6b119bef97ecc3986aa
- https://github.com/paijp/nophp/releases/tag/v0.0.1
- https://github.com/paijp/nophp/security/advisories/GHSA-9858-q3c2-9wwm
