CVE-2024-57546
📋 TL;DR
This vulnerability in CMSimple v5.16 allows remote attackers to perform Server-Side Request Forgery (SSRF) attacks through the validate link function. Attackers can exploit this to access internal network resources, potentially exposing sensitive information. All systems running the vulnerable version are affected.
💻 Affected Systems
- CMSimple
📦 What is this software?
Cmsimple by Cmsimple
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, retrieve sensitive data from internal systems, or pivot to attack other internal resources.
Likely Case
Information disclosure from internal services, potentially exposing credentials, configuration files, or other sensitive data.
If Mitigated
Limited impact if network segmentation restricts internal access and input validation is implemented.
🎯 Exploit Status
The GitHub reference contains detailed exploitation information and proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after v5.16
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Upgrade to the latest version of CMSimple. 2. Replace the vulnerable validate link function files with patched versions from the repository.
🔧 Temporary Workarounds
Disable validate link function
allRemove or disable the vulnerable validate link functionality in CMSimple.
Input validation filter
allImplement strict input validation to block crafted URLs in the validate link function.
🧯 If You Can't Patch
- Implement network segmentation to restrict CMSimple server's access to internal resources.
- Deploy a web application firewall (WAF) with SSRF protection rules.
🔍 How to Verify
Check if Vulnerable:
Check if CMSimple version is 5.16 by examining the installation files or admin panel.Check Version:
Check the CMSimple version in the admin panel or via the installation files.Verify Fix Applied:
Test the validate link function with crafted URLs to ensure it no longer performs unauthorized requests.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from the CMSimple server to internal IP addresses or services.
Network Indicators:
- HTTP requests from CMSimple server to internal resources not typically accessed.
SIEM Query:
source_ip="CMSimple_server_ip" AND dest_ip IN (internal_subnets) AND protocol="HTTP"