CVE-2024-4358
📋 TL;DR
An authentication bypass vulnerability in Progress Telerik Report Server allows unauthenticated attackers to access restricted functionality. This affects versions 2024 Q1 (10.0.24.305) and earlier running on IIS. Organizations using vulnerable Telerik Report Server deployments are at risk.
💻 Affected Systems
- Progress Telerik Report Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Telerik Report Server instance, allowing attackers to access sensitive reports, modify configurations, and potentially pivot to other systems.
Likely Case
Unauthorized access to confidential reports and data stored in the reporting system, potentially leading to data exfiltration.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
CISA has added this to their Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024 Q2 (10.0.24.514) or later
Vendor Advisory: https://docs.telerik.com/report-server/knowledge-base/registration-auth-bypass-cve-2024-4358
Restart Required: Yes
Instructions:
1. Download the latest version from Telerik website. 2. Backup current installation. 3. Run the installer to upgrade. 4. Restart IIS services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
windowsRestrict network access to Telerik Report Server to only trusted IP addresses
Use Windows Firewall or network ACLs to limit access
IIS Request Filtering
windowsConfigure IIS request filtering to block suspicious patterns
Configure in IIS Manager > Request Filtering
🧯 If You Can't Patch
- Isolate the Telerik Report Server in a separate network segment with strict access controls
- Implement web application firewall (WAF) rules to detect and block authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check Telerik Report Server version in administration panel or examine installed program version in Windows Programs and FeaturesCheck Version:
Check Telerik Report Server web interface or examine installed programsVerify Fix Applied:
Verify version is 10.0.24.514 or later and test authentication requirements for restricted functionality📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to restricted endpoints
- Failed authentication attempts followed by successful access
Network Indicators:
- Unusual traffic patterns to Telerik Report Server from untrusted sources
SIEM Query:
source="Telerik Report Server" AND (event_type="authentication_bypass" OR status="200" AND user="anonymous")