CVE-2011-4943
📋 TL;DR
CVE-2011-4943 is a critical remote code execution vulnerability in ImpressPages CMS v1.0.12 that allows attackers to execute arbitrary code on affected systems. This affects all websites running the vulnerable version of ImpressPages CMS. The vulnerability was fixed in v1.0.13.
💻 Affected Systems
- ImpressPages CMS
📦 What is this software?
Impresspages Cms by Impresspages
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Website defacement, data theft, or installation of backdoors for persistent access.
If Mitigated
Limited impact with proper network segmentation and web application firewalls in place.
🎯 Exploit Status
The vulnerability allows remote code execution without authentication, making it highly exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.13 and later
Vendor Advisory: http://www.openwall.com/lists/oss-security/2012/03/23/16
Restart Required: No
Instructions:
1. Backup your website and database. 2. Download ImpressPages CMS v1.0.13 or later from the official repository. 3. Replace all files with the new version. 4. Verify functionality.
🔧 Temporary Workarounds
Web Application Firewall
allImplement a WAF with rules to block RCE attempts
Network Segmentation
allIsolate the CMS server from critical internal networks
🧯 If You Can't Patch
- Take the system offline immediately
- Implement strict network access controls and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check the ImpressPages CMS version in the admin panel or by examining the filesystem for version markers.Check Version:
Check the ImpressPages version in the admin interface or look for version files in the installation directory.Verify Fix Applied:
Verify the version is v1.0.13 or later and test CMS functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to CMS endpoints
- Suspicious file uploads or modifications
- Unexpected system command execution
Network Indicators:
- Unusual outbound connections from the CMS server
- Traffic patterns indicating exploitation attempts
SIEM Query:
source="web_server" AND (url="*impresspages*" OR method="POST") AND status="200" AND size>10000