CVE-2020-23362
📋 TL;DR
This CVE describes an insecure permissions vulnerability in Shop_CMS YerShop that allows remote attackers to escalate privileges via the cover_id parameter. Attackers can gain unauthorized administrative access by manipulating this parameter. All users running Shop_CMS YerShop are affected.
💻 Affected Systems
- Shop_CMS YerShop
📦 What is this software?
Yershop by Yershop Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attacker gains full administrative control, can modify all content, steal sensitive data, and potentially execute arbitrary code.
Likely Case
Unauthorized privilege escalation leading to administrative access, allowing content manipulation, user data access, and configuration changes.
If Mitigated
Limited impact with proper access controls, but still potential for unauthorized actions if other vulnerabilities exist.
🎯 Exploit Status
Simple parameter manipulation required. The GitHub reference shows proof of concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider migrating to alternative software or implementing workarounds.
🔧 Temporary Workarounds
Input Validation for cover_id Parameter
allImplement strict input validation and authorization checks for the cover_id parameter
Modify application code to validate cover_id parameter against user permissions
Web Application Firewall Rules
allBlock suspicious cover_id parameter values at the WAF level
Add WAF rule to block cover_id parameter manipulation attempts
🧯 If You Can't Patch
- Isolate the Shop_CMS instance behind strict network segmentation
- Implement additional authentication layers and monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Test if unauthorized users can manipulate cover_id parameter to gain elevated privilegesCheck Version:
Check Shop_CMS version in admin panel or configuration filesVerify Fix Applied:
Verify that cover_id parameter manipulation no longer results in privilege escalation📡 Detection & Monitoring
Log Indicators:
- Unusual cover_id parameter values in access logs
- Multiple failed privilege escalation attempts
- Unexpected administrative actions from non-admin users
Network Indicators:
- HTTP requests with manipulated cover_id parameters
- Unusual traffic patterns to admin endpoints
SIEM Query:
source="web_logs" AND (cover_id=* OR "cover_id"=*) AND user_role!="admin" AND status=200