CVE-2020-23768
📋 TL;DR
This vulnerability in PHPPYUN's Alibaba payment interface allows attackers to access sensitive user information from log files. It affects PHPPYUN systems using the vulnerable alipay_function.php component. Attackers can obtain personally identifiable information including email addresses and telephone numbers.
💻 Affected Systems
- PHPPYUN
📦 What is this software?
Phpyun by Phpyun
⚠️ Risk & Real-World Impact
Worst Case
Mass exfiltration of user PII leading to identity theft, targeted phishing campaigns, and regulatory compliance violations.
Likely Case
Targeted extraction of user contact information for spam, phishing, or social engineering attacks.
If Mitigated
Limited information disclosure with proper access controls and log file protections in place.
🎯 Exploit Status
Exploitation involves accessing improperly protected log files containing sensitive data.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0.1
Vendor Advisory: https://github.com/whiskey-jj/w2s2x2222.github.io/issues/1
Restart Required: No
Instructions:
1. Upgrade PHPPYUN to version 5.0.1 or later. 2. Verify the alipay_function.php file has been updated. 3. Review and secure log file permissions.
🔧 Temporary Workarounds
Restrict log file access
linuxSet proper file permissions on log files to prevent unauthorized access
chmod 600 /path/to/alipay/logs/*
chown www-data:www-data /path/to/alipay/logs/*
Move logs outside web root
linuxRelocate log files to a directory not accessible via web server
mv /var/www/html/logs/alipay/ /var/log/phpyun/alipay/
ln -s /var/log/phpyun/alipay/ /var/www/html/logs/alipay
🧯 If You Can't Patch
- Implement strict access controls on log directories using web server configuration
- Regularly monitor and audit access to sensitive log files
🔍 How to Verify
Check if Vulnerable:
Check if PHPPYUN version is below 5.0.1 and if alipay_function.php log files are accessible via web requestsCheck Version:
grep -r 'version' /path/to/phpyun/configuration/files/ | grep -i '5\\.0\\.'Verify Fix Applied:
Verify PHPPYUN version is 5.0.1 or higher and test that alipay log files are no longer accessible via web📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to alipay log files
- HTTP requests for .log files in alipay directories
Network Indicators:
- HTTP GET requests to paths containing 'alipay' and '.log' extensions
SIEM Query:
source="web_access_logs" AND (uri="*alipay*" AND uri="*.log") AND status=200