CVE-2020-26641
📋 TL;DR
This CSRF vulnerability in iCMS 7.0.16 allows attackers to trick authenticated users into executing malicious web scripts without their knowledge. Attackers can perform unauthorized actions on behalf of victims, potentially compromising the CMS administration. All users running iCMS 7.0.16 are affected.
💻 Affected Systems
- iCMS
📦 What is this software?
Icms by Idreamsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the iCMS installation, allowing attackers to execute arbitrary administrative actions, modify content, inject persistent malware, or take over the entire CMS instance.
Likely Case
Unauthorized content modification, user account creation/deletion, configuration changes, or injection of malicious scripts that affect site visitors.
If Mitigated
Limited impact with proper CSRF protections, though some risk remains if other vulnerabilities are chained together.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users. CSRF attacks are well-understood and easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.17 or later
Vendor Advisory: https://bbs.pediy.com/thread-262308.htm
Restart Required: No
Instructions:
1. Backup current iCMS installation. 2. Download iCMS 7.0.17 or later from official source. 3. Replace affected files with patched versions. 4. Verify CSRF tokens are properly implemented in all forms.
🔧 Temporary Workarounds
Implement CSRF Protection
allAdd CSRF tokens to all forms and validate them server-side
Add anti-CSRF token generation and validation to form handling code
SameSite Cookie Attribute
allSet SameSite=Strict or Lax on session cookies
Set-Cookie: session=value; SameSite=Strict; HttpOnly; Secure
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block CSRF attempts
- Require re-authentication for sensitive administrative actions
🔍 How to Verify
Check if Vulnerable:
Check if iCMS version is 7.0.16 by examining version files or admin panelCheck Version:
Check /admin/index.php or version.txt file for version informationVerify Fix Applied:
Verify version is 7.0.17+ and test forms for CSRF token implementation📡 Detection & Monitoring
Log Indicators:
- Multiple failed form submissions without CSRF tokens
- Unusual administrative actions from unexpected IPs
Network Indicators:
- POST requests to admin endpoints without Referer headers or CSRF tokens
- Requests from known malicious domains to admin interfaces
SIEM Query:
source="web_logs" AND (uri_path="/admin/*" OR uri_path="/*.php") AND http_method="POST" AND NOT csrf_token=*